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Keithley 2790, Reference Manual

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18-4

Model 2790 SourceMeter

®

 Switch System Reference Manual

Replacing the AMPS fuse

The front panel AMPS fuse protects the Model 2790 AMPS current input from an over-
current condition. Follow the steps below to replace the AMPS fuse.

t^okfkd

Make sure the instrument is disconnected from the power line and 
other equipment before replacing the AMPS fuse. 

1.

Turn off the power and disconnect the power line and test leads.

2.

Rotate the fuse carrier one-quarter turn counterclockwise. (See 

Figure 18-2

.) 

Release pressure on the jack and its internal spring will push the fuse carrier out of 
the socket.

3.

Remove the fuse and replace it with the same type: 3A, 250V, fast-blow, Keithley 
part number FU-99-1.

`^rqflk

Do not use a fuse with a higher current rating than specified or instru-
ment damage may occur. If the instrument repeatedly blows fuses, 
locate and correct the cause of the trouble before replacing the fuse.

4.

Install the new fuse by reversing the above procedure. 

Figure 18-2

AMPS fuse

F

!

F

Model 2790 

SourceMeter Switch System

RANGE

F

500V

PEAK

FRONT/REAR

3A 250V

AMPS

HI

INPUT

LO

SENSE

Ω

 4 WIRE

INPUTS

350V

PEAK

1000V

PEAK

AUTO

SHIFT

LOCAL

POWER

RANGE

R

EXIT

ENTER

DIGITS RATE

REL

FILTER

TRIG

EX TRIG

STORE RECALL

OPEN

DCV

DCI

MATH

O U T P U T

RATIO

ACV

ACI

Ω

2

Ω

4

FREQ

TEMP

CH AVG

CONT

PERIOD SENSOR

LIMITS

ON/OFF

DELAY

HOLD

SAVE

SETUP

CONFIG

HALT

TYPE

LSYNC

TEST

MONITOR

STEP

SCAN

OCOMP

CH-OFF

CARD

CLOSE

RS-232

GPIB

Rotate

Counterclockwise

Model 2790

Summary of Contents for 2790

Page 1: ...m o c y e l h t i e k w w w E C N E D I F N O C F O E R U S A E M R E T A E R G A Reference Manual 2790 901 01 Rev E August 2011 Model 2790 SourceMeter Switch System...

Page 2: ...Model 2790 SourceMeter Switch System Reference Manual 2011 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Document Number 2790 901 01 Rev E...

Page 3: ......

Page 4: ...form them Otherwise they should be performed only by service personnel Service personnel are trained to work on live circuits perform safe installations and repair products Only properly trained servi...

Page 5: ...standing on a dry insulated surface capable of withstanding the voltage being measured The instrument and accessories must be used in accordance with its specifications and operating instructions or t...

Page 6: ...ting and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component note that selected parts should b...

Page 7: ......

Page 8: ...oltage and replacing fuse 1 14 Power up sequence 1 15 Keyclick 1 16 Display 1 16 Status and error messages 1 16 Remote programming display 1 16 Defaults and user setups 1 18 Saving and restoring setup...

Page 9: ...itching module capabilities 2 31 Model 7702 switching module 2 33 Switching module capabilities 2 33 Schematic diagram 2 34 Memory patterns 2 36 Description 2 36 Recalling memory patterns from the fro...

Page 10: ...ents 3 27 Trigger level 3 27 Gate time 3 27 Connections 3 28 Frequency and period measurement procedure 3 29 Continuity testing 3 30 Connections 3 30 Continuity testing procedure 3 31 Remote programmi...

Page 11: ...xIohms 5 12 SxVohms 5 13 Basic operation 5 14 Remote programming math 5 15 Ratio and channel average 7702 only 5 18 Basic operation 5 19 Remote programming ratio and channel average 5 21 dB 5 22 Remot...

Page 12: ...anning programming example 7 33 Scanning examples 7 33 External trigger scan 7 34 Monitor scan 7 37 8 Triggering Trigger model 8 2 Idle 8 2 Control source and event detection 8 3 Delay auto or manual...

Page 13: ...ents 10 2 Pseudocards 10 2 Autozero 10 2 dB calculation 10 2 Separate function setups 10 2 DCV input divider 10 3 Multiple channel operation 10 3 GPIB setup 10 3 GPIB standards 10 3 Selecting GPIB and...

Page 14: ...r sets 11 2 Queues 11 2 Clearing registers and queues 11 4 Programming and reading registers 11 5 Programming enable registers 11 5 Reading registers 11 6 Status byte and service request SRQ 11 6 Stat...

Page 15: ...l conditions 16 2 Warm up period 16 3 Line power 16 3 Recommended test equipment 16 4 Verification limits 16 5 Example reading limit calculation 16 5 Calculating resistance reading limits 16 5 Restori...

Page 16: ...17 3 Calibration code 17 4 Front panel calibration code 17 4 Remote calibration code 17 4 Comprehensive calibration 17 5 Calibration cycle 17 5 Recommended equipment 17 5 Aborting calibration 17 6 Fr...

Page 17: ...7753 V source A 9 Signal processing sequence C 2 Basic signal processing C 2 Signal processing using instrument features C 3 Signal processing using Ratio or Ch Avg C 6 Data flow remote operation C 7...

Page 18: ...ds F 8 Addressed multiline commands F 8 Address commands F 9 Unaddress commands F 9 Common commands F 9 SCPI commands F 9 Command codes F 10 Typical command sequences F 12 IEEE command groups F 13 Int...

Page 19: ...nt source calibration commands G 20 DATA G 20 SAVE G 21 Remote error reporting G 22 Error summary G 22 Error queue G 24 Status byte EAV Error Available bit G 24 Generating an SRQ on error G 24 Detecti...

Page 20: ...s Summarizes the capabilities of the Keithley Models 7702 7751 7752 and 7753 switching modules QS1 Front and rear panel familiarization Summarizes the controls and connectors of the instrument QS2 Pow...

Page 21: ...ates a connection terminal to the equipment frame The WARNING heading used in this manual explains dangers that might result in personal injury or death Always read the associated information very car...

Page 22: ...annels of 4 pole input It also has two 2 pole channels used exclusively for current input Model 7751 This module has an on board programmable current source 0 to 50mA to test bridgewires and shunt bar...

Page 23: ...k mount kits Model 4288 1 fixed rack mount kit Single unit rack mount kit Carrying case Model 1050 padded carrying case A carrying case for the Model 2790 includes handles and shoulder strap Model 279...

Page 24: ...cal manipula tion of readings Also included are math functions to calculate low ohms when using the 7751 7752 7753 module and high ohms using the 7751 7753 module Relative Null offsets or establish ba...

Page 25: ...Max3 2 4 wire Thermistor 4 wire RTD N A N A Latching electromechanical Oversized screw terminals Multiplexer2 All DMM functions 8 channels N A 8 channels 4 channels No Yes Connect no external sources...

Page 26: ...instrument will operate as if the module is installed That is the Model 2790 will operate as if the pseudocard is installed klqb To avoid erratic operation it is not recommended to install or remove s...

Page 27: ...SHIFT key and then the function operation key 1 Special keys and power switch SHIFT Use to select a shifted function or operation LOCAL Cancels GPIB remote mode POWER Power switch In position turns 2...

Page 28: ...gs and buffer statistics Use the and keys to navigate through buffer FILTER Enables disables filter for selected function REL Enables disables relative for selected function and Dual function Manually...

Page 29: ...ontinuity or limits testing Digital input output or analog output active set to non default value 4W 4 wire resistance or 4 wire RTD temperature reading displayed AC AC function selected ACV dB or ACI...

Page 30: ...the INPUTS switch position SYSTem FRSWitch Query INPUTS switch 0 rear 1 front 6 Handle Pull out and rotate to desired position 7 Front panel inputs INPUT HI and LO Used for DCV ACV 2 CONT FREQ PERIOD...

Page 31: ...onnector for IEEE 488 GPIB operation Use a shielded cable such as Models 7007 1 and 7007 2 5 Power module Contains the AC line receptacle power line fuse and line voltage setting The instrument can be...

Page 32: ...e to the instrument possibly voiding the warranty 2 Before plugging in the power cord make sure that the front panel power switch is in the off O position Figure 1 3 Power module 3 Connect the female...

Page 33: ...g fuse A rear panel fuse located next to the AC receptacle protects the power line input of the instrument If the line voltage setting needs to be changed or the line fuse needs to be replaced perform...

Page 34: ...01 is the display board ROM revision Installed switching modules are then displayed For example if there is a Model 7751 installed in slot 1 and a Model 7752 installed in slot 2 the following messages...

Page 35: ...ious states of operation See Front panel summary page 1 8 for a complete listing of display annunciators klqb The display test allows you to test display digit segments and annunciators The key test c...

Page 36: ...OCAL key or sending GTL can cels the message and disables the text message mode DISPlay ENABle ON OFF Control display circuitry This command is used to enable and disable the front panel display circu...

Page 37: ...terface The factory and RST default settings are listed in Table 1 4 Setting differences Set Diff between the two default setups are indicated by checkmarks For remote programming the SYSTem PRESet an...

Page 38: ...present power on setup 5 Use the or key to display the desired setup and press ENTER The instrument returns to the normal measurement state Restoring a setup 1 Press SHIFT and then SETUP to access th...

Page 39: ...ty Beeper On On Digits 4 digits 4 digits Range 1k 1k Rate Fast 0 1 PLC Fast 0 1 PLC Threshold level 10 10 Current AC and DC Bandwidth AC 30 30 Digits AC 5 digits 5 digits Digits DC 6 digits 6 digits F...

Page 40: ...Off Off Reference 1 0 1 0 S1Iohms 7751 7752 and 7753 Off Off S2Iohms 7751 7752 and 7753 Off Off S1Vohms 7751 and 7753 Off Off S2Vohms 7751 and 7753 Off Off Monitor Off Off Output Beeper Never Never D...

Page 41: ...effect No effect Timer Off Off Reading count No effect No effect Advanced scan Setup No effect No effect Immediate trigger On On Limit triggers Off Off Timer Off Off Reading count No effect No effect...

Page 42: ...2790 to setup stored in memory location 2 Setting Factory RST Set Diff Voltage AC and DC dB Off Off Reference 1 0 1 0 Digits AC 5 digits 5 digits Digits DC 6 digits 6 digits Filter On Off Window 0 1 0...

Page 43: ...nd word A query command requests queries the programmed status of that command When a query command is sent and Model 2790 is addressed to talk the response message is sent to the computer klqb For co...

Page 44: ...ce the instrument in a non continuous measurement mode Most of the other settings for factory and RST defaults are the same For remote programming the following command is used to select function klqb...

Page 45: ...ngs4 Press RECALL use edit keys to display readings Press EXIT to exit recall mode TRAC DATA 1 To avoid problems with remote programming it is good practice to routinely clear the buffer TRAC CLE at t...

Page 46: ...ing a system channel connects the input to the DMM Input of the Model 2790 For a 4 wire function i e 4 a channel pair is connected to the DMM when a system channel is closed The system input channel i...

Page 47: ...n the clist For example to close input channel 3 for a module in slot 1 the following command would be sent ROUTe CLOSe 103 2 Only the closed system channel is returned by ROUTe CLOSe The paired chann...

Page 48: ...T OPEN ALL 2 Select 2 function Press 2 FUNC RES 3 Close system channel 201 Press the key Channel 1 connects to DMM Input ROUT CLOS 201 4 Close system channel 202 Press the key Channel 2 connects to DM...

Page 49: ...1 5 shows the front panel keys used to close and open channels Figure 1 5 Front panel keys to close and open channels multiple channel operation For remote programming the following three commands are...

Page 50: ...ultiple channel operation Front panel operation Command sequence 1 Open all channels Press OPEN display OPEN ALL Press OPEN ROUT OPEN ALL 2 Select 2 function Press 2 FUNC RES 3 Close channels to conne...

Page 51: ...determines the number of scans to perform and is best explained by an example Assume there are 10 channels in the scan list i e 101 through 110 If you set the reading count to 10 or less one scan of...

Page 52: ...N CHAN XXX INT SIMPLE Display SIMPLE option and press ENTER Specify minimum channel XXX and press ENTER SHIFT SCAN STEP CONFIG Press SHIFT Press CONFIG STEP MAX CHAN YYY Specify maximum channel YYY an...

Page 53: ...3 Configure scan Press SHIFT press CONFIG select INT SIMPLE set MIN CHAN201 set MAX CHAN 208 select TIMER NO set RDG CT 000008 ROUT SCAN 201 208 SAMP COUN 8 4 Enable and start scan2 ROUT SCAN LSEL INT...

Page 54: ...se 5 Trigger and return a single reading Exercise 6 Trigger and return multiple readings Exercise 7 Return a single reading continuous triggering Details on the commands to trigger and return readings...

Page 55: ...N 1 SAMP COUN 1 Place 2790 in non continuous trigger state Set 2790 to perform one measurement 1 If a MATH function is enabled the result of the calculation will be returned MATH functions are covered...

Page 56: ...are automatically stored in the buffer Statistics for buffer readings are also stored in the buffer CALC2 commands are used to calculate and return buffer statistics see Section 6 for details TRAC CL...

Page 57: ...rigger state 1 If a MATH function is enabled the result of the calculation will be returned If there is no MATH function enabled FETCh and CALC DATA will return the basic reading MATH functions are co...

Page 58: ...ber and switching module channel number System channel operation 7702 only Provides detailed information for using system channel operation Multiple channel operation Provides detailed information for...

Page 59: ...unintended device under test connections In such system applications it is the system designer builders sole responsibility to ensure that under all such potential fault conditions no hazardous or da...

Page 60: ...e channel operation the OVERFLOW message will not occur until the maximum voltage of the mainframe not module is exceeded Therefore the OVERFLOW message would occur only if 1010V is exceeded t okfkd C...

Page 61: ...stallation t okfkd Slot covers must be installed on unused slots to prevent personal contact with high voltage circuits klqb Only one Model 7753 can be installed in a Model 2790 and it should be insta...

Page 62: ...om unlimited energy sources NEVER connect an external source to the Model 2790 front panel inputs or a 7702 module t okfkd Dangerous arcs of an explosive nature in a high energy circuit can cause seve...

Page 63: ...pseudocards SYSTem PCARd1 name Install pseudocard in slot 1 SYSTem PCARd2 name Install pseudocard in slot 2 name C7702 c7751 c7752 or c7753 Programming example The following command sets up the Model...

Page 64: ...ed on the Model 2790 When a channel is not displayed there is no system channel When a measurement channel is closed the input backplane isolation channel also closes to connect the system channel to...

Page 65: ...example of system channel connections for a 4 wire function Assume a Model 7702 switching module is installed in slot 2 of the mainframe and a 4 wire function such as 4 is selected When channel 201 i...

Page 66: ...hannels available one of the following messages will be briefly displayed when one of these keys is pressed NO SCAN CARD This message indicates that there are no switching modules or pseudocards insta...

Page 67: ...ule installed in the mainframe 2 With CLOSE SINGLE displayed press ENTER to display the prompt to close a channel CLOSE CH XXX 3 Using and key in the three digit channel you want to select 4 Press ENT...

Page 68: ...stalled in slot 2 OPEN ALL will open all measurement channels 201 to 240 241 and 242 the backplane isolation channels 244 and 245 and the 2 pole 4 pole channel 243 Figure 2 2 shows the backplane isola...

Page 69: ...command will result in error 222 Parameter data out of range b ROUTe CLOSe STATe clist This query returns a 0 open or 1 closed for every measurement channel specified in the clist For example assume...

Page 70: ...Multiple channel operation allows individual control of each channel in the test system It allows any channel or channels in the test system to be closed or opened Channels for the 7751 7752 and 7753...

Page 71: ...Never handle a switching module that is connected to an external source that is turned on Turn off all power sources before 1 making or breaking connections to the module and 2 installing or removing...

Page 72: ...nu page 2 26 1 Press the CLOSE key and then use the or key to display the CLOSE MULTI message 2 Press ENTER to display the prompt to close a channel CLOSE MLT XXX 3 Using and key in the three digit ch...

Page 73: ...ss the OPEN key The OPEN ALL message will be displayed 2 Press the or key to display the OPEN MULTI message 3 Press ENTER to display the prompt to open a channel OPEN MLT XXX 4 Using and key in the th...

Page 74: ...specified in the clist only those listed channels will open Channels not specified are not affected c ROUTe OPEN ALL This command functions the same as the front panel OPEN key ALL menu option It sim...

Page 75: ...this command to query channels 201 204 and 245 clist 201 204 245 The response message returns 0 0 1 to indicate that channels 201 and 204 are open and channel 245 is closed Remote programming example...

Page 76: ...the DMM Input However the Model 2790 will not display the measurement channel that is closed It will display channel 201 instead of channel 202 1 Use the ALL option for the OPEN key to open all channe...

Page 77: ...el 243 isolates channel 201 from channel 221 The Model 2790 will display the 1k reading for system channel 201 Remote programming ROUT CLOS 201 3 Using the MULTI option for the OPEN key open channel 2...

Page 78: ...own in Figure 2 8 the closed position of channel 43 isolates Multiplexer A channels 1 through 20 from Multiplexer B channels 21 through 40 For the dual multiplexer configuration only Multiplexer A cha...

Page 79: ...also connects the DUT to the external source This channel must remain closed while testing DUT Opening channel 44 isolates the external source from the backplane of the Model 2790 This channel must r...

Page 80: ...T 1 H1 LO Ch 2 DUT 2 H1 LO Ch 20 DUT 20 H1 LO Ch 21 H1 LO Ch 22 H1 LO Ch 40 H1 LO Ch 43 Closed Ch 45 Ch 44 H1 LO Source Model 7702 Switching Module Model 2790 DMM The source could be the I source or V...

Page 81: ...SE Select MULTI Key in 245 Press ENTER Remote programming ROUT MULT CLOS 243 245 3 Close channels 1 and 21 to connect DUT 1 to the DMM and bias supply Front panel operation Press CLOSE Select MULTI Ke...

Page 82: ...witching Module Model 2790 Slot 2 Equivalent Circuit DUT 1 Ch 43 Closed HI LO HI LO HI LO HI LO HI LO DMM Mutliple channel operation Open all channels Close channel 243 Close channel 245 Close channel...

Page 83: ...items and options and set parameter values With the desired item option or setting displayed press the ENTER key to select it You can cancel a pending selection and exit the menu structure by press in...

Page 84: ...peed of the channel string is adjustable or can be paused The key slows down scrolling speed and the key speeds it up The ENTER key pauses scrolling Press ENTER a second time to resume scrolling Exiti...

Page 85: ...f closed 7702 channels including the paired channel for 4 wire measurements It will not return non measurement channels For details see Table 2 1 and related reference information ROUT MULT CLOS is us...

Page 86: ...remote operation The commands are summa rized in Table 2 3 Details follow the table klqb The relay closure count can be reset to zero For details see Section 18 of this manual Table 2 3 Relay closure...

Page 87: ...the card only at a user set time interval which is initially set to 15 minutes at the factory or whenever the counts are queried Valid intervals set in integer number of minutes are between 10 and 14...

Page 88: ...When closed the cable discharge circuit is connected across the input channels Used to dissipate charge build up due to capacitance in cables and signal paths Channel 21 Closing this channel connects...

Page 89: ...4 LO Source Sense Ch 5 Bank 2 J102 A2 B2 Ch 6 HI Source Sense Ch 7 LO Source Sense Ch 8 Bank 3 J103 A3 B3 Ch 9 HI Source Sense Ch 10 LO Source Sense Ch 11 Bank 4 J104 A4 B4 Ch 12 Interlock Guard Guard...

Page 90: ...imply the 7702 module can be used with EXTERNAL SOURCES i e non 7751 7753 derived above 300V DC peak rqflk To prevent damage to the Model 7702 switching module do not exceed these maximum signal level...

Page 91: ...45 will close There is a 2 pole 4 pole relay channel 43 between channels 1 20 and channels 21 40 When a 2 wire function i e DCV is selected channel 43 opens 2 pole position to allow any of the 40 cha...

Page 92: ...O Input Channel 43 2 Pole Open 4 Pole Closed see Note 3A 3A To Model 2790 Backplane Channel 45 see Note Backplane Isolation Channel 44 see Note Backplane Isolation Channels 43 through 45 in this schem...

Page 93: ...an recall an individual Memory Pattern to close multiple channels and take a reading More importantly you can include Memory Patterns in a scan list and cause the Model 2790 to automatically scan thro...

Page 94: ...is executed If any channels in clist are not valid analog output channels Error 221 Settings Conflict results c ROUTe MEMory DELay n NRf Assign a variable delay in seconds to memory pattern n This del...

Page 95: ...ll memory pattern attributes will be associated to the reading klqb The ROUT MEM READ STAT command applies only to scanning You must include at least one measurement channel or a memory pattern that t...

Page 96: ...ng Memory pattern scanning Once set up memory patterns can be automatically scanned in the same manner as 7702 module channels Section 7 has complete information on scanning Memory patterns program ex...

Page 97: ...he source settings in the appropriate Memory Pattern for each individual test SOUR VOLT 500 128 Set V Source to 500V SOUR CURR 0 05 127 Set I Source 50mA Note Allow 250ms maximum settling time for V s...

Page 98: ...lso shown below Setup Bridgewire A Test Memory Pattern Location 3 ROUT MEM CHAN 3 101 102 117 118 121 Specify relays to close ROUT MEM SOUR LEV 3 0 05 127 Set Isrc to 50mA for M3 since this source lev...

Page 99: ...tter case the reading must be initiated explicitly as also shown below Setup Shunt Bar A Test Memory Pattern Location 5 ROUT MEM CHAN 5 101 102 112 117 118 121 Specify relays to close 112 is shunt bar...

Page 100: ...Voltage Verification Memory Pattern Location 7 ROUT MEM CHAN 7 109 112 122 113 118 123 121 Specify relays to close 109 and 112 are shunt bars ROUT MEM SOUR LEV 7 500 128 Set Vsrc to 500V for M7 Since...

Page 101: ...g scan during a scan the measurement is initiated automatically This does not apply when a memory pattern is recalled as shown below In the latter case the reading must be initiated explicitly as also...

Page 102: ...tions being scanned These Trigger and Sample Count values cause memory locations to be scanned one time TRAC CLE Clear the nonvolatile data buffer TRAC POIN 9 Set buffer size to 9 readings TRAC FEED C...

Page 103: ...ring with comma separators between the values The string will have to be parsed to obtain the individual readings The inspection process can actually be automated by assigning limits to the memory loc...

Page 104: ...igure 2 14 Test setup for memory pattern test example 2790 Mainframe Ch 1 Ch 2 Ch 4 Ch 5 Ch 7 Ch 8 Bank 1 Bank 2 Bank 3 7751 7753 Module SEN LO SEN HI SRC LO SRC HI SRC HI SEN LO SEN HI SRC LO SRC HI...

Page 105: ...2 48 Model 2790 SourceMeter Switch System Reference Manual...

Page 106: ...asic DC and AC voltage measurements Current measurements DCI and ACI Provides detailed information for making basic DC and AC current measurements Resistance measurements 2 and 4 Provides detailed inf...

Page 107: ...e wrong channel s is closed t okfkd An external source can be used with a 7702 module However when testing airbags or other devices that present a danger from unlimited energy sources NEVER connect an...

Page 108: ...llation Category I and signal lines must not be directly connected to AC mains When making measurements in high energy circuits use test leads that meet the following requirements Test leads should be...

Page 109: ...ternal voltages corresponding to offsets zero and amplifier gains These measurements are used in the algorithm to calculate the reading of the input signal This process is known as autozeroing When au...

Page 110: ...itive going zero crossing of the power line cycle If the next trigger Trigger 2 occurs during the negative cycle then the measurement process also starts with the positive going zero crossing Figure 3...

Page 111: ...onfiguration menu as explained in Section 7 For remote programming the clist parameter is used to config ure scan channels Channel list parameter clist SCH where S Mainframe slot number 1 or 2 CH Swit...

Page 112: ...in the Model 2790 can also be scanned by using memory patterns see Memory patterns page 2 36 Each memory pattern location can have its own unique setup that includes channel s to close source level if...

Page 113: ...voltage probe must be terminated to a 10M load The input divider cannot be enabled from the front panel For remote programming the following command controls the input divider VOLT IDIVider b Enable O...

Page 114: ...z Input Resistance 10M on 1000V and 100V ranges 10G on 10V 1V and 100mV ranges CAUTION Maximum Input 1000V peak A DCV Connections B ACV Connections F F F 500V PEAK FRONT REAR 3A 250V AMPS HI INPUT LO...

Page 115: ...and so on As shown in Figure 3 3C one DC voltage source is connected to a primary channel i e 104 and the other source is connected to its paired channel i e 124 klqb The ratio and channel average cal...

Page 116: ...e to use with Model 7751 7753 Vsource t okfkd If both the front panel terminals and the switching module terminals are connected at the same time the test leads must be rated to the highest voltage th...

Page 117: ...ow particularly for low level sources Improper shielding can cause the Model 2790 to behave in one or more of the following ways Unexpected offset voltages Inconsistent readings between ranges Sudden...

Page 118: ...isplay 100 counts of offset on AC volts with the input shorted This offset is caused by the offset of the TRMS converter This offset will not affect reading accuracy and should not be zeroed out using...

Page 119: ...out position For switching modules it must be in the R in position t okfkd To prevent electric shock never make or break connections while power is present in the test circuit Front panel inputs When...

Page 120: ...measured rqflk Do not apply more than 3A to the input or the AMPS fuse will blow Model 7702 switching module When performing current measure ments the maximum allowable voltage is 60VDC or 30V RMS Exc...

Page 121: ...hing module there are solder mount amps fuses See Section 18 of this manual for fuse replacement information Resistance measurements 2 and 4 The Model 2790 uses the constant current method to measure...

Page 122: ...connect the test leads to INPUT HI and LO as shown in Figure 3 6A For 4 wire resistance 4 connect the test leads to INPUT HI INPUT LO SENSE 4 HI and SENSE 4 LO as shown in Figure 3 6B Figure 3 6 2 an...

Page 123: ...aired to channel 21 channel 2 is paired to channel 22 and so on Figure 3 7 2 and 4 connections for Model 7702 switching module Shielding To achieve a stable reading it helps to shield resistances grea...

Page 124: ...be measured rqflk Front panel inputs Do not apply more than 1000V peak between INPUT HI and LO or instrument damage may occur Model 7702 switching module Do not apply more than 300V DC or RMS between...

Page 125: ...essing sequence page C 2 for details It includes a flowchart showing where in the processing sequence that the OCOMP operation is performed For a normal resistance measurement the Model 2790 sources a...

Page 126: ...100 1k or 10k range or press AUTO to enable autorange If using autorange offset compensated ohms measurements will not be performed if the instrument goes to the 100k or higher range 4 Perform steps...

Page 127: ...are used in the equation to calculate thermistor tempera ture The thermistor manufacturer s specified curve fitting constants may not be exactly the same as the ones used by the Model 2790 Appendix E...

Page 128: ...e front panel inputs the INPUTS switch must be in the F out position For switching modules it must be in the R in position Thermistor connections A thermistor can be connected directly to the front pa...

Page 129: ...ature from the temperature measurement configuration menu Use the following general rules to navigate through the menu structure Press SHIFT and then SENSOR to enter the menu structure Cursor position...

Page 130: ...nfiguration The Alpha Beta Delta and at 0 C parameters for the five basic RTD types are provided in Table 3 3 Note that these parameters can be modified using remote programming Table 3 2 Thermistor t...

Page 131: ...must be in the R in position 1 If a switching channel is presently closed displayed press OPEN to open it 2 Select the temperature measurement function by pressing TEMP 3 Configure the temperature mea...

Page 132: ...l Frequency and period use a zero crossing trigger meaning that a count is taken when the frequency crosses the zero level The Model 2790 uses a reciprocal counting technique to measure frequency and...

Page 133: ...puts the INPUTS switch must be in the F out position For switching modules it must be in the R in position Front panel input When using the front panel input terminals connect the test leads to the IN...

Page 134: ...to select the function Press FREQ to perform frequency measurements Press SHIFT and then FREQ to perform period measurements 3 Use the RANGE and keys to select a measurement range consistent with the...

Page 135: ...d display the resistance readings When the measured circuit is above the threshold level the message OPEN will be displayed klqb The reading rate for continuity is fixed at FAST 0 1 PLC Limits and dig...

Page 136: ...eper will sound and the ohms reading will be displayed If the measurement is above the threshold level the message OPEN will be displayed 5 To disable continuity testing select a different function i...

Page 137: ...Basic measurement commands Commands1 Description Default Ref Select measurement function SENSe 1 Optional root command FUNCtion name clist Select measurement function name VOLTage DC VOLTage AC CURRen...

Page 138: ...ant for USER type NRf 0 to 0 01 0 00385 c TEMPerature FRTD BETA NRf clist Specify constant for USER type NRf 0 to 1 00 0 111 c TEMPerature FRTD DELTa NRf clist Specify constant for USER type NRf 0 to...

Page 139: ...tional root command DATA LATest Returns the last reading string g DATA FRESh Returns the last fresh reading string g FETCh Return reading s g READ Trigger and return reading s g Channel list parameter...

Page 140: ...hannel Details on scanning are provided in Section 7 b FRESistance OCOMpensated b clist The instrument does not have to be on the 4 function to enable offset compensated ohms When 4 is selected offset...

Page 141: ...Tinuous OFF you can use the INITiate command to trigger one or more measurements klqb Note that sending INITiate while the instrument is performing measurements will cause error 213 init ignored SENSe...

Page 142: ...to retrieve the reading strings With continuous initiation disabled INITiate CONTinuous OFF you can use the READ command to trigger and return readings The sample count determines the number of readi...

Page 143: ...ng Example 3 temperature measurement using Model 7702 The following command sequence places the Model 2790 in a one shot trigger mode to per form a thermistor temperature measurement at channel 101 Mo...

Page 144: ...the same reading over and over using this query It will continue to give the same result until one of two things has happened A new reading has been triggered The old reading has been invalidated by...

Page 145: ...el is continuously initiating INIT CONT ON sending this query may cause a 213 Init ignored error but will still give a new reading When appropriate If the Model 2790 receives a RST command then it def...

Page 146: ...r a reading to complete if a reading is in progress The CALC DATA FRESh query is similar to the DATA FRESh query but applies to readings which have math applied to them e g MX B scaling SENSe 1 DATA L...

Page 147: ...speed TRIGger COUNt 1 READ Enter reading One shot reading DC volts bus trigger auto ranging RST INITiate CONTinuous OFF ABORt TRIGger SOURce BUS SENSe FUNCtion VOLTage DC SENSe VOLTage DC RANGe AUTO O...

Page 148: ...ogramming Digits Provides details on selecting display resolution Includes the commands for remote programming Rate and bandwidth Provides details on integration rate and bandwidth for AC measurements...

Page 149: ...yed FREQ and PERIOD Frequency measurements from 3Hz to 500kHz and period measurements from 2 s to 333 s can be made on the ACV ranges TEMP There is no range selection for temperature measurements Temp...

Page 150: ...t automatically selects the best range to measure the applied signal Auto ranging should not be used when optimum speed is required Note that the AUTO key has no effect on temperature TEMP Up ranging...

Page 151: ...AUTO b clist Control DCI auto range b ON or OFF ON CURRent AC RANGe UPPer n clist Select ACI range n 0 to 3 A 3 CURRent AC RANGe UPPer AUTO b clist Control ACI auto range b ON or OFF ON RESistance RAN...

Page 152: ...e manually RANGe n When auto range is enabled the parameter value for RANGe n changes to the automatically selected range value When auto range is disabled the instru ment remains at the selected rang...

Page 153: ...resolution To set display resolution press the DIGITS key until the desired number of digits is displayed Scanning 7702 only When a simple scan using a 7702 module is configured the present digits set...

Page 154: ...ption Default SENSe 1 Optional root command VOLTage DC DIGits n clist Set of digits for DCV n 4 to 7 7 VOLTage AC DIGits n clist Set of digits for ACV n 4 to 7 6 CURRent DC DIGits n clist Set of digit...

Page 155: ...the front panel 0 01 PLC from the bus results in increased reading noise and fewer usable digits while the slowest integra tion time 5 PLC from the front panel 50 PLC from the bus provides the best co...

Page 156: ...he other functions will also set to medium speed For remote programming each function can have its own unique rate setting 0 01 to 50 or 60 PLC klqb Rate cannot be set for continuity It is fixed at 0...

Page 157: ...6 6ms For remote program ming the integration rate can be set from 0 01 PLC to 50 or 60 PLC Table 4 4 lists the front panel bandwidth settings for the AC measurement functions For remote programming t...

Page 158: ...2 5 0 TEMPerature APERture NRf clist Set rate for TEMP in secs NRf x to 13 Note 4 Bandwidth commands SENSe 1 Optional root command VOLTage AC DETector BANDwidth NRf clist Set AC bandwidth for ACV in H...

Page 159: ...Hz klqb A rate command NPLCycles or APERture for ACV and ACI is only valid if the bandwidth for that AC function is set to 300 300Hz to 300kHz See Rate and bandwidth conflict error below for details R...

Page 160: ...e digital filter places a specified number of A D conversions Filter Count into a memory stack These A D conversions must occur consecutively within a selected reading window Filter Window The reading...

Page 161: ...erature reading The maximum temperature depends on which transducer is being used For example for a thermistor the maximum reading is 150 C a 10 window means that the filter window is 15 C Filter type...

Page 162: ...stack The FILT annunciator will flash until 10 new readings fill the stack klqb Bit 8 of the Operation Event Status Register sets when the filter window has properly settled or the filter is disabled...

Page 163: ...4 Use the and keys to display the number of readings to filter 1 to 100 and press ENTER 5 Use the or key to display the desired filter type moving or repeating and press ENTER The filter turns on and...

Page 164: ...ively set to NONE and if the mov ing filter is selected the filter will not enable when the scan is run For the advanced scan filter state on or off and count can be set for each channel You cannot se...

Page 165: ...nd VOLTage AC AVERage TCONtrol name Select filter type name MOVing or REPeat Note 2 VOLTage AC AVERage WINDow NRf Set filter window in NRf 0 to 10 0 1 VOLTage AC AVERage COUNt n clist Specify filter c...

Page 166: ...EPeat Note 2 TEMPerature AVERage WINDow NRf Set filter window in NRf 0 to 10 0 1 TEMPerature AVERage COUNt n clist Specify filter count n 1 to 100 10 TEMPerature AVERage STATe b clist Enable or disabl...

Page 167: ...ER WIND 0 01 Set filter window to 0 01 CURR AVER COUN 10 Set to filter 10 readings CURR AVER ON Enable filter Example 2 The following command sequence configures channels 101 through 115 of the Model...

Page 168: ...ions for the 7751 7752 and 7753 modules Details on these math operations are provided in Section 2 of the Model 2790 User s Manual Ratio and channel average 7702 only Explains how to use these calcula...

Page 169: ...that range For example on the 10V range the Model 2790 still overflows for a 12V input klqb The various instrument operations including Relative are performed on the input signal in a sequential mann...

Page 170: ...can channel 101 is going to be configured for DCV and use rel select DCV and close channel 101 2 Apply the DCV signal to be rel ed to the closed channel This could be an offset or a baseline level 3 P...

Page 171: ...clist Use input signal as rel value Rel commands for ACV SENSe 1 Optional root command VOLTage AC REFerence n clist Specify rel value n 757 5 to 757 5 V 0 VOLTage AC REFerence STATe b clist Enable dis...

Page 172: ...r FREQ SENSe 1 Optional root command FREQuency REFerence n clist Specify rel value n 0 to 1 5e7 Hz 0 FREQuency REFerence STATe b clist Enable disable rel b ON or OFF OFF FREQuency REFerence ACQuire cl...

Page 173: ...strument is on the DCV function the only valid acquire command is VOLT DC REF ACQ Also if the instrument is overflowed OVERFLOW or a reading has not been triggered an execution error 200 occurs when A...

Page 174: ...he high ohms calculation is available Figure 5 1 shows the MATH menu tree Note that the settings shown in the menu tree are the factory defaults klqb The various instrument operations including Math a...

Page 175: ...lt 3 Key in the scale factor value The and keys control cursor position and the and keys increment decrement the digit value To change range place the cursor on the multiplier and use the and keys m 0...

Page 176: ...eading will be displayed 0 4 R klqbp The m and b constants for m X b are coupled to the m and b constants for mX b If you change any of the constants for m X b they will also change for mX b When usin...

Page 177: ...and keys toggle polarity 4 Press ENTER to enter the m value and display the offset b value b 00 00000 m factory default 5 Key in the offset value 6 Press ENTER to enter the b value and display the on...

Page 178: ...ys control cursor position and the and keys increment decrement the digit value To change range place the cur sor on the multiplier and use the and keys m 0 001 1 K 1000 and M 1 000 000 With the curso...

Page 179: ...the Model 2790 It is the X variable for the calculation mX b When the SxIohms calculation is selected the Model 2790 measures voltage X and cal culates mX b using the above factors The displayed read...

Page 180: ...X b 20 000 is the value of the feedback resistor RF for the I V amplifier RF 20k VMEAS is the measured voltage by the DMM of the Model 2790 It is the X variable for the calculation m X b When the SxV...

Page 181: ...an nel s to connect the input to the DMM If using the front panel inputs FRONT inputs selected it does not matter if a switching channel is closed The result of the math calculation will be displayed...

Page 182: ...1 KMATh MBFactor TRACk b Enable or disable source tracking3 OFF CALCulate 1 KMATh MBFactor SOURce name Selects source to be tracked name NONE S1ISource S2ISource S1VSource S2VSource NONE CALCulate 1...

Page 183: ...ACQuire command When a reference value is set using PERCent NRf the PERCent query command returns the programmed value When reference is set using ACQuire the PERCent query com mand returns the acqui...

Page 184: ...The following command sequence performs the mX b calculation for channels 101 and 102 of the Model 7702 Keep in mind that after CALC DATA is sent the Model 2790 has to be addressed to talk to send th...

Page 185: ...paired to channel 22 and so on When ratio or channel average is enabled the Model 2790 measures the closed primary channel It then opens the primary channel and closes and measures the paired channel...

Page 186: ...the result of the channel average calculation To disable channel average again press SHIFT and then CH AVG 5 When finished there are two ways to disable the calculation Press the OPEN key The calculat...

Page 187: ...tails to configure and run a scan are provided in Section 7 Advanced scan configuration notes 1 When a calculation ratio or channel average is enabled for a primary scan channel the following setup ac...

Page 188: ...This delay cannot be set from the front panel The 0 5s default delay keeps the relays from cycling too fast Setting a shorter delay may shorten the life of the relays It does not matter which of the...

Page 189: ...d 125 FUNC VOLT 103 Set 103 for DCV RAT ON 103 Set 103 for ratio on FUNC VOLT 105 Set 105 for DCV CAV ON 105 Set 105 for channel average on dB Expressing DC or AC voltage in dB makes it possible to co...

Page 190: ...Details on these commands follow the table klqb Queries are not included in Table 5 4 All the dB commands are provided in Table 15 11 Table 5 4 dB commands Commands Description Def DCV dB commands UN...

Page 191: ...ect DCV function UNIT VOLT DB Select DCV dB UNIT VOLT DB REF 1V Set dB reference to 1V Example 2 The following command sequence configures channels 101 and 105 of the Model 7702 to perform ACV dB meas...

Page 192: ...how to store and recall readings and discusses the various statistics available on buffer data including minimum and maximum values average mean standard deviation and peak to peak values Remote prog...

Page 193: ...the processing sequence that buffer operations occur Front panel buffer Auto clear With buffer auto clear enabled the buffer is cleared readings lost before a new storage operation starts The buffer c...

Page 194: ...ST front panel or remote operation However front panel FACTory defaults enables buffer auto clear Enabling disabling buffer auto clear 1 Press SHIFT and then SETUP 2 Use the and keys to display the pr...

Page 195: ...the relative timestamp resets to 0 sec when the instrument is turned back on If you have readings stored in the buffer and auto clear is disabled when the unit is turned off subsequent stored reading...

Page 196: ...lative REL or real time clock RTCL and press ENTER Storing readings Perform the following steps to store readings 1 Set up the Model 2790 for the desired configuration 2 Press the STORE key 3 Use the...

Page 197: ...will increase by incrementing or decre menting the buffer reading number by 100 and then finally by 500 When you get close to the desired reading number release the or key Again press and hold in the...

Page 198: ...The following equation is used to calculate mean where y is the average Xi is a stored reading n is the number of stored readings RDG NO 10 Reading Value Time Date RDG NO 9 Reading Value Time Date RDG...

Page 199: ...ta store operation INIT and multi sample READ queries are locked out With readings in the buffer that were stored in that manner you cannot use the INIT or READ command if sample count is 1 error 225...

Page 200: ...fer control name NEVer NEXT or ALWays NEV h TRACe DATA Read all readings in the buffer i TRACe DATA SELected start count Specify readings to be returned start starting point count number of readings j...

Page 201: ...the timestamp will not clear the buffer SYSTem TSTamp TYPE and TRACe TSTamp TYPE Both of these commands query the timestamp type However SYSTem TSTamp TYPE queries the timestamp that will be used for...

Page 202: ...math calculation For the CALCulate parameter the result of the calcula tion is stored in the buffer The NONE parameter disables storage into the buffer Math functions are covered in Section 5 klqb In...

Page 203: ...cation for the next stored reading TRACe NEXT Query buffer location for next stored reading Assume that the above query returned value 37 Now you can use that value as the count parameter for the foll...

Page 204: ...olute or DELTa timestamp as set by the TRACe TSTamp FORMat command FORMat ELEMents READing CHANnel UNITs RNUMber TSTamp LIMits Choose the elements to be outputted with each DATA or each buffer reading...

Page 205: ...ndard deviation calculation is being performed on a buffer that has more than 1000 readings the CALCULATING message will flash to indicate that the Model 2790 is busy While busy with the calculation r...

Page 206: ...annel program ming format the difference between sequential and non sequential scans and the basic scan process Block diagrams known as trigger models are provided to help explain the STEP and SCAN op...

Page 207: ...Rd1 C7702 Install 7702 pseudocard in slot 1 SYSTem PCARd2 C7702 Install 7702 pseudocard in slot 2 Pseudocards for other switching modules can instead be installed Details on installing other pseudocar...

Page 208: ...nned the unit backs up to scan channel 103 It then proceeds forward to scan channel 109 Any scan that performs backward scanning is considered a non sequential scan For more information on non sequent...

Page 209: ...ions also use paired channels The scan process is to 1 open any closed channels 2 close the primary displayed channel and perform a measurement 3 open the pri mary channel 4 close the paired channel a...

Page 210: ...o Figure 7 1 for STEP operation and Figure 7 2 for SCAN operation Figure 7 1 Trigger model with STEP function 7702 module Enable Scan Control Source Immediate External Timer Event Detection Output Tri...

Page 211: ...ernal Timer Manual Bus Event Detection Another Scan Trigger Counter Yes No Close First Chan in List Open Last Chan Close Next Chan in List Ratio Chan Average Delay Measurement Process Device Action Ou...

Page 212: ...the scan list is measured the Model 2790 outputs a trigger pulse If programmed to again scan the channels in the scan list the Model 2790 will wait at the control source for another trigger event Afte...

Page 213: ...ng between scans It has no effect on the timing between scanned channels External trigger control source Pressing the EX TRIG key places the instrument in the external trigger mode TRIG annunciator on...

Page 214: ...ult delay period is 0 5 sec onds but can be set from 0 to 999999 999 seconds using remote programming see Section 5 for details Ratio and channel average are covered in Section 5 klqb The Ratio Chan A...

Page 215: ...example if channels 101 102 and 103 are programmed to be scanned the Sample Count is 3 Output trigger STEP operation After each channel is scanned an output trigger is applied to the rear panel Trigg...

Page 216: ...scan configuration menu which is accessed by pressing SHIFT and then CONFIG Figure 7 3 shows the basic flowchart to configure a scan After entering the menu structure you can configure a simple scan a...

Page 217: ...e setup As explained in Trigger models page 7 4 there is a user set delay auto or manual that is in effect for both the simple and advanced scan Channel setup considerations Rel In order to use an acq...

Page 218: ...enus when a saved front panel scan is recalled The reading count value in the menu may not reflect the actual reading count of the scan For example Assume a Model 7702 module configured for a 10 chann...

Page 219: ...nfigure a simple scan 1 While in the normal measurement mode set up the instrument for your test This setup will be used for all selected channels in the scan 2 Press SHIFT and then CONFIG to access t...

Page 220: ...re RTD TEMP is selected The annunciators indicate which of the other instrument settings are enabled for the selected channel When you edit settings for the selected channel auto range rel rate etc th...

Page 221: ...other channels are not affected Advanced scan setup procedure Step 1 Select the advanced scan configuration menu 1 Press SHIFT and then CONFIG to access the scan setup menu 2 Press the or key to displ...

Page 222: ...EP or SCAN key Use the or key to display IMM SCAN Y and press ENTER klqb Disable immediate scan IMM SCAN N when you wish to use a monitored reading limit to trigger the start of the scan This techniqu...

Page 223: ...TRIGger DELay AUTO b commands are used to set the delay See Table 7 1 for details klqb The delay for ratio and channel average can only be set using remote program ming Table 5 3 Monitor channel While...

Page 224: ...he monitor 2 Press SHIFT and then MONITOR MON annunciator turns on Method 2 1 If a channel is closed press OPEN to open it 2 Press SHIFT and then MONITOR 3 Use the and keys to display the monitor chan...

Page 225: ...rn to the normal measurement state klqbp Auto channel configuration cannot be enabled if there is a non scan channel presently closed For example assume the scan list consists of channels 105 through...

Page 226: ...power on setup Scan operation 7702 only A basic scan is controlled solely by the STEP and SCAN keys When one of these keys is pressed the STEP or SCAN operation will be performed For the manual extern...

Page 227: ...for each channel For example assume one channel used OCOMP ohms while a second used 2 When the readings are recalled the OCOMP annunciator may remain on for both channels This display anomaly is due...

Page 228: ...l 2790 goes into the idle state If you wish to repeat the scan sequence you will have to first take the Model 2790 out of idle This can be done by pressing the STEP or TRIG key SCAN operation In gener...

Page 229: ...er the start of the scan Perform the following steps to run a monitor scan klqb The last enabled scan function STEP or SCAN will be used for the monitor scan 1 Perform Step 1 and Step 2 of the Advance...

Page 230: ...OUTe MONitor POINts com mand to specify the number of channels to scan Table 7 1 4 While in the normal measurement state select and enable the monitor channel as explained in Monitor channel page 7 18...

Page 231: ...to initiate one scan cycle include INITiate Initiate one scan cycle READ Initiate one scan cycle and request sample readings More information on using these commands is provided by Reference f that f...

Page 232: ...ont panel data store opera tion must be cleared before sending INITiate or READ to take the instrument out of idle The following command clears the buffer TRACe CLEar Clear buffer 7751 7752 7753 modul...

Page 233: ...tern scanning Enable Scan Control Source Immediate External Timer Manual Bus Event Detection Another Scan Trigger Counter Yes No Make Measurement Output Trigger Another Location Yes No Sample Counter...

Page 234: ...scan b ON or OFF Note 1 ROUTe SCAN LSELect name Enable disable scan name INTernal on or NONE off NONE ROUTe MONitor clist Specify one channel to be monitored c ROUTe MONitor POINts NRf Specify number...

Page 235: ...55000 1 e SAMPle COUNt Query sample count INITiate CONTinuous b Enable disable continuous initiation b ON or OFF f INITiate Initiate one scan cycle f READ Initiate one scan cycle and request sample re...

Page 236: ...ed to be performed using remote pro gramming Unexpected results may occur if a non sequential scan is run from the front panel There must be at least two channels in the scan list Creating a scan list...

Page 237: ...an list If it is not the first channel in the scan list will auto matically become the monitor channel If the clist has more than one channel error 223 too much data occurs and the command is not exec...

Page 238: ...ontrol source TRIG COUN 1 Set to perform one scan SAMP COUN 10 Set to scan 10 channels ROUT SCAN 101 110 Set scan list channels 101 through 110 ROUT SCAN TSO IMM Start scan when enabled and triggered...

Page 239: ...fer Each time the scan is run the two readings will be appended added to the buffer A thermistor is used to measure temperature The thermistor is connected directly to the screw terminals of the switc...

Page 240: ...del 2790 SourceMeter Switch System Reference Manual 7 35 Figure 7 5 External trigger scan example 2 Measurements Measure Open Last Chan Close Next Chan No Yes Wait For Trigger Close Chan 101 Enable Sc...

Page 241: ...el 101 Select TEMP function FUNC TEMP 101 Configure temperature SHIFT SENSOR Select thermistor sensor SENS THRMSTR TEMP TRAN THER 101 Select thermistor type TYPE 5000 TEMP THER 5000 101 b Channel 102...

Page 242: ...on is shown in Figure 7 6 while the procedure steps and programming commands are listed in Table 7 3 In Figure 7 6 notice that there are two modes of operation While in the monitor mode the Model 2790...

Page 243: ...stem Reference Manual Figure 7 6 Monitor scan example 30 C 4 Measurements Measure TEMP Close Monitor Channel 101 No Yes Measure Open Last Chan Close Next Chan Close First Channel Return to Monitor Mod...

Page 244: ...limit 1 Set limit to 30 SHIFT LIMITS HI1 30 00000 CALC3 LIM1 UPP 30 101 Enable on limit SHIFT OFF ON LIMITS ON CALC3 LIM1 STAT ON 101 Enable Channel Average SHIFT CH AVG CAV ON 101 Close channel 1 RO...

Page 245: ...7 40 Model 2790 SourceMeter Switch System Reference Manual...

Page 246: ...ettle Explains the Reading Hold feature which is used to screen out readings that are not within a specified reading window External triggering Explains external triggering which allows the Model 2790...

Page 247: ...fault setup the instru ment will not stay in idle Operation will continuously fall through the idle state and pro ceed to the Event Detection block of the trigger model When in the one shot trigger mo...

Page 248: ...auto or manual A programmable delay is available after event detection It can be set manually or an auto delay can be used With auto delay selected the instrument automatically selects a delay period...

Page 249: ...ote that pressing the AUTO key sets the delay to 0 001 sec Press ENTER to accept the delay or EXIT for no change Table 8 1 Auto delay settings Function Range and delay DCV 100mV 1ms 1V 1ms 10V 1ms 100...

Page 250: ...it is rejected and operation loops back to the beginning of the Device Action in Figure 8 2 The hold count specifies how many readings have to be within the window before it is accepted See Reading ho...

Page 251: ...ing is held on the display until an out of window reading occurs to restart the hold process For remote operation the hold process seeks a new seed once it has been satisfied and the reading has been...

Page 252: ...es are displayed to indicate the instrument is waiting for an external trigger From the front panel press the TRIG key to trigger a single reading Pressing the EX TRIG key again toggles back to contin...

Page 253: ...h 5V input triggers are enabled When pulled low to 0V input triggers are disabled When disabled the Model 2790 will not respond to an input trigger Details on the Digital I O are provided in Section 9...

Page 254: ...an be used to trigger other instruments The specifications for this trigger pulse are shown in Figure 8 5 Typically you would want the Model 2790 to output a trigger after the settling time of each me...

Page 255: ...shown in Figure 8 6 Figure 8 6 DUT test system DUT 1 DUT 400 DUT 2 OUTPUT Card 1 1 2 400 10 7011 MUX Cards Model 2790 F F Model 2790 SourceMeter Switch System RANGE F 500V PEAK FRONT REAR 3A 250V AMP...

Page 256: ...ored Scan list 1 1 1 400 Number of scans 1 Channel spacing TrigLink Figure 8 7 Trigger link connections Model 2790 KEITHLEY SLOT COVER DIGITAL I O TRIG LINK RS232 CARD 1 CARD 2 CARD 3 CARD 4 CARD 5 CA...

Page 257: ...triggering example A Pressing EX TRIG on the Model 2790 places it at point A in the flowchart where it is waiting for an external trigger B Pressing STEP on the Model 7002 takes it out of the idle sta...

Page 258: ...riggers the Model 2790 to measure the next DUT The process continues until all 400 channels are scanned measured and stored in the buffer External triggering with BNC connections An adapter cable is a...

Page 259: ...TAL I O TRIG LINK RS232 8503 DIN to BNC Trigger Cable INPUT OUTPUT Model 220 Current Source External Trigger WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION F...

Page 260: ...state the instrument cannot perform any measure or step scan operations The following commands will return operation to the top of the trigger model idle at the START point of the trigger model ABORt...

Page 261: ...IMM or INIT CONT ON No Yes Idle and Initiate Trigger Source Immediate Trigger Source External Trigger Source Timer Trigger Source Manual Trigger Source BUS Trigger Delay n Trigger Delay AUTO b Another...

Page 262: ...erwise the length of the delay is controlled by the user set Delay period The Timer interval can be set from 0 to 999999 999 seconds The timer resets to its initial state when the instrument goes into...

Page 263: ...trigger cycle b INITiate CONTinuous b Enable disable continuous initiation ON or OFF Note 1 c FETch Request the last reading s d READ Perform an ABORt INITiate and a FETch d TRIGger SOURce name Selec...

Page 264: ...ger DELay AUTO b The auto delay times are listed in Table 8 1 Disabling auto delay sets the delay time to 0 g TRIGger SIGNal Send this action command to bypass the control source when you do not wish...

Page 265: ...8 20 Model 2790 SourceMeter Switch System Reference Manual...

Page 266: ...tputs respond to the results of limit tests Remote programming limits and digital output Summarizes the com mands to perform limit tests and control the digital I O port Application sorting resistors...

Page 267: ...its which are the factory defaults Limit 1 HI1 1V and LO1 1V Limit 2 HI2 2V and LO2 2V Keep in mind that a limit value for Limit 2 does not have to exceed the Limit 1 value For example Limit 2 can be...

Page 268: ...beeper is also available for limit testing There are three beeper options NEVER OUTSIDE and INSIDE These options are explained as follows NEVER With this option the beeper is disabled OUTSIDE With thi...

Page 269: ...ction Setting limits 1 Press SHIFT and then LIMITS to display the high limit for Limit 1 HI1 2 Use and to key in the HI1 limit and press ENTER 3 When editing a reading use the range designator K or M...

Page 270: ...triggering Pin 6 is physically connected to the input line pin 2 of the TRIG LINK connector Pin 8 of the digital I O is used to enable or disable Trigger In Trigger In is enabled by leav ing pin 8 op...

Page 271: ...controlled by limit operations Each of these five outputs correspond to the following limit operations Digital Output 1 Low Limit 1 LO1 Digital Output 2 High Limit 1 HI1 Digital Output 3 Low Limit 2...

Page 272: ...e programming Pulse time cannot be set from the front panel klqb The commands to set pulse time and enable disable pulse output are listed in Table 9 2 See Digital output commands in the table The pul...

Page 273: ...5V and 33V and the current required by the device does not exceed 250mA rqflk On pin 7 do not exceed 33V For the output lines do not exceed the maximum sink current The maximum sink current for an out...

Page 274: ...puts to active TTL low power TTL or CMOS inputs For this mode of operation the output lines can source up to 200 A 4 75k Pull Up Resistor Pin 9 Digital Ground Digital Output Pin 7 Diode Clamp Relay Co...

Page 275: ...or switch open to provide a reli able logic high output 3 75V When the output line goes low the transistor turns on transistor switch closed to route current to digital ground As a result a low logic...

Page 276: ...r limit latch When enabled the master limit remains latched when a reading limit is reached or exceeded When disabled the master limit line releases immediately when the reading is inside all four lim...

Page 277: ...ess ENTER 7 Use the key to display the present PULSE mode setting NO or YES 8 To retain the present pulse mode setting press ENTER Otherwise press to move the cursor to the right press the or key to d...

Page 278: ...Enable disable Limit 1 test b ON or OFF a CALCulate3 LIMit1 FAIL Query test result 0 pass in 1 fail high or low b CALCulate3 LIMit1 CLEar Clear fail indication c CALCulate3 LIMit1 CLEar AUTO b Enable...

Page 279: ...reaches or exceeds the high or low limit the HIGH or LOW annunciator will turn on and the number 2 will be displayed klqb When limits are disabled from the front panel both Limit 1 and Limit 2 disable...

Page 280: ...ons for Limit 1 and Limit 2 If auto clear is enabled for a limit the fail indication clears when instrument opera tion enters the idle state With auto clear disabled the fail indication will remain un...

Page 281: ...ceed 5 tolerance The digital outputs of the Model 2790 can be used to further automate the test system by controlling a compatible component handler to perform the binning operations Limits Limit test...

Page 282: ...5 The limits are illustrated in Figure 9 7 Figure 9 7 Limits to sort 100 resistors 1 5 and 5 Front Panel Operation For front panel operation the INSIDE beeper mode must be used A normal pitch beep and...

Page 283: ...command Digital outputs With the digital outputs of the Model 2790 enabled the digital outputs will respond as fol lows for each resistor reading Limit 1 result Limit 2 result Resistor tolerance Bin...

Page 284: ...address selection and bus connections General bus commands Describes general bus commands used for fundamental GPIB control Front panel GPIB operation Summarizes GPIB error messages status indicators...

Page 285: ...is part of the normal measurement process to assure stable accurate measure ments Autozero can be disabled to increase measurement speed However the readings will eventually become inaccurate over ti...

Page 286: ...ROUTe MULTiple commands you gain independent control of all switching module channels including the relays that con nect the input signal to the DMM See Section 2 for details GPIB setup The following...

Page 287: ...B key The GPIB ON or GPIB OFF message will be displayed 2 If the GPIB is already ON press ENTER and proceed to step 3 Otherwise press the key to place the cursor on OFF press the or key to display the...

Page 288: ...nt screws which are silver colored Do not use these types of connectors on the Model 2790 it is designed for metric threads Figure 10 2 shows a typical connecting scheme for a multi unit test system F...

Page 289: ...ed with an IEEE 488 style connector but a few may require a different type of connecting cable See your controller s instruction manual for information about properly connecting to the IEEE 488 bus kl...

Page 290: ...instrument in the remote state You must address the instrument to listen after setting REN true before it goes into remote The Model 2790 must be in remote in order to use the following commands to tr...

Page 291: ...essing LOCAL will not restore control to the front panel The GTL command restores control to the front panel Cycling power will also cancel local lockout GTL go to local Use the GTL command to put a r...

Page 292: ...rmed at any time to obtain the status byte from the Model 2790 Front panel GPIB operation This section describes aspects of the front panel that are part of GPIB operation including messages status in...

Page 293: ...ten addressing it to talk or sending IFC Interface Clear command over the bus SRQ You can program the instrument to generate a service request SRQ when one or more errors or conditions occur When this...

Page 294: ...d optional and does not have to be used Thus the above command can be sent in one of two ways INITiate or INITiate IMMediate Notice that the optional command is used without the brackets When using op...

Page 295: ...ENABle 110 222 Enable errors 110 through 222 Angle brackets Angle brackets are used to denote a parameter type Do not include the brackets in the program message For example RATio b The b indicates a...

Page 296: ...long form SYST PRES short form SYSTem PRES long form and short form combination Note that each command word must be in long form or short form and not something in between For example SYSTe PRESe is...

Page 297: ...s STATus Path Root OPERation Path ENABle NRf Command and parameter ENABle Query command PRESet Command Single command messages The above command structure has three levels The first level is made up o...

Page 298: ...command word on the next level as the root For fastest operation do not send optional data A colon can be used at the beginning of a program message However using the colon slows down execution time E...

Page 299: ...n the Output Queue When the Model 2790 is then addressed to talk the response message is sent from the Output Queue to the computer Multiple response messages If you send more than one query command i...

Page 300: ...r you connect to the multimeter also uses these settings You can break data transmissions by sending a C decimal 3 or X decimal 18 charac ter string to the instrument This clears any pending operation...

Page 301: ...d after the CR character is received from the controller klqb For RS 232 operation OPC or OPC should be used with slow responding commands A list of the slowest responding commands and details on OPC...

Page 302: ...e key to place the cursor on OFF press the or key to display the ON state and then press ENTER klqb Enabling ON the RS 232 interface disables OFF the GPIB Disabling the RS 232 interface enables the GP...

Page 303: ...the rear panel connector for the RS 232 interface and Table 10 2 shows the pinout for the connector If your computer uses a DB 25 connector for the RS 232 interface you will need a cable or adapter wi...

Page 304: ...mputer PC Error messages See Appendix B for RS 232 error messages 800 through 808 Table 10 3 PC serial port pinout Signal DB 9 pin number DB 25 pin number DCD data carrier detect 1 8 RXD receive data...

Page 305: ...10 22 Model 2790 SourceMeter Switch System Reference Manual...

Page 306: ...er in the status structure Status byte and service request SRQ Explains how to program the Status Byte to generate service requests SRQs Shows how to use the serial poll sequence to detect SRQs Status...

Page 307: ...ogrammed by the user the RQS MSS bit will set to indicate that an SRQ has occurred Status register sets A typical status register set is made up of a condition register an event register and an event...

Page 308: ...Enable Register Questionable Condition Register Questionable Event Register 0 2 3 5 6 Cal 7 11 12 13 15 1 Temp Warn 0 2 3 5 6 Cal 7 11 12 13 15 1 Temp Warn 0 2 3 5 6 Cal 7 11 12 13 15 1 Temp Warn Outp...

Page 309: ...tion Notes Reset registers CLS Reset all bits of the following event registers to 0 1 Standard Event Register Operation Event Register Measurement Event Register Questionable Event Register STATus PRE...

Page 310: ...ns of the register Figure 11 2 indicate the binary parameter value For example if you wish to set bits B4 B3 and B1 the binary value would be 11010 where B4 1 B3 1 B1 1 and all other bits are 0 The bi...

Page 311: ...are set 1 Status byte and service request SRQ Service request is controlled by two 8 bit registers the Status Byte Register and the Ser vice Request Enable Register Figure 11 3 shows the structure of...

Page 312: ...ent in the Error Queue Bit B3 Questionable Summary Bit QSB Set summary bit indicates that an enabled questionable event has occurred Bit B4 Message Available MAV Set summary bit indicates that a respo...

Page 313: ...set bit B6 and generate an SRQ service request In your test program you can periodically read the Status Byte to check if an SRQ has occurred and what caused it If an SRQ occurs the program can for ex...

Page 314: ...valid command is sent line 3 bits B2 EAV and B6 MSS of the Status Byte Register set to 1 The last command reads the Status Byte Register Keep in mind that you have to address the Model 2790 to talk af...

Page 315: ...ls that are equivalent to the initialize transmit send srq and spoll calls used below SRQ when buffer fills with 500 1000 1500 and 1750 readings The following program will store 2000 readings in the b...

Page 316: ...Disable standard events CALL send addr sre 1 status Enable measurement events CALL send addr init status Start measure store process N 0 Initialize quarter buffer counter WaitSRQ WHILE srq 0 WEND Wai...

Page 317: ...that all pending selected device operations are completed and the Model 2790 is ready to accept new com mands This bit only sets in response to the OPC query command See Section 12 for details on OPC...

Page 318: ...ror 520 Saved setup scancard mismatch Settings for a user setup or power on setup do not match the switching module types presently installed For details see Defaults and user setups page 1 18 Error 5...

Page 319: ...et bit indicates that the filter has settled or the filter is disabled Bit B9 Not used Bit B10 Idle State Idle Set bit indicates the Model 2790 is in the idle state Bits B11 through B15 Not used Figur...

Page 320: ...eadings have been stored in the buffer The TRACe NOTify command specifies the number of stored readings that will set this bit see Section 6 for details Bit B7 Buffer Available BAV Set bit indicates t...

Page 321: ...F B9 BHF B8 BAV B7 BN B6 RAV B5 HL2 B4 LL2 B3 HL1 B2 LL1 B1 ROF B0 OR To Measurement Summary Bit MSB of Status Byte Register ML Master Limit BTF Buffer Three quarter Full BQF Buffer Quarter Full HL Ha...

Page 322: ...will instead use a default calibration constant This error will clear after successful calibration of the instrument Bit B9 Slot 1 Interlock Open Int1 Set bit indicates that the interlock for the modu...

Page 323: ...etails on read ing registers see Reading registers page 11 6 Table 11 3 Condition register commands Command Description STATus OPERation CONDition Read Operation Condition Register STATus MEASurement...

Page 324: ...CLS resets all four event registers The commands to read the event registers are listed in Table 11 4 For details on reading registers see Reading registers page 11 6 Table 11 4 Event register comman...

Page 325: ...set to 1 Attempting to do so will generate a 222 Parameter data out of range error Programming example program and read register set The following command sequence programs and reads the measurement r...

Page 326: ...iate query is sent Error queue The Error Queue holds error and status messages When an error or status event occurs a message that defines the error status is placed in the Error Queue When a message...

Page 327: ...removed from the enabled list klqb To prevent all messages from entering the Error Queue send the enable com mand along with the null list parameter as follows STATus QUEue ENABle Programming example...

Page 328: ...12 CommonCommands...

Page 329: ...r all pending commands have been executed B OPC Operation complete query Places an ASCII 1 into the output queue when all pending selected device operations have been completed C OPT Option query Retu...

Page 330: ...used with the immediate initiation command INITiate the OPC bit in the Standard Event Status Register will not set until the Model 2790 goes back into the idle state The INIT command operation is not...

Page 331: ...t to the computer The 1 in the Output Queue will set the MAV Message Available bit B4 of the Status Byte Register If the corresponding bit B4 in the Service Request Enable Register is set the RQS MSS...

Page 332: ...d SYST PRES RCL and SAV ROUT MULT CLOS and ROUT MULT OPEN Only if the clist is long CALC2 IMM Only when performing the standard deviation calculation on a large buffer A 10 000 point buffer takes appr...

Page 333: ...up memory If a recall error occurs the setup memory defaults to the SYSTem PRESet values klqb For RS 232 operation OPC or OPC should be used with SAV and RCL which are slow responding commands Details...

Page 334: ...el 2790 to be controlled by bus triggers The last line which sends a bus trigger triggers one measurement Each subsequent bus trigger will also trigger a single measurement RST Restore RST defaults TR...

Page 335: ...ot considered complete until the Model 2790 returns to idle By sending the WAI command after the INITiate command all subsequent commands will not execute until the Model 2790 goes back into idle The...

Page 336: ...13 SCPISignalOriented MeasurementCommands...

Page 337: ...le 13 1 Signal oriented measurement command summary Command Description CONFigure function rang res clist FETCh READ MEASure function rang res clist Places the Model 2790 in a one shot measurement mod...

Page 338: ...ax error If only one parameter is used and it is not a clist it is interpreted as the range parameter rang If two parameters are used and the second one is not a clist the first parameter is the range...

Page 339: ...ution of the res parameter value and the selected range sets the number of display digits As shown above with the 100V range selected and res 0 1 a 100V reading will be displayed as 100 0 V 3 digits T...

Page 340: ...command to trigger a measurement and acquire a reading see READ When this command is sent without the clist parameter the Model 2790 will be configured as follows The function specified by this comma...

Page 341: ...der to return multiple reading strings continuous initiation must be disabled INIT CONT OFF so that the sample count SAMPle COUNt which specifies the number of measurements to be performed can be set...

Page 342: ...initiation is enabled the READ command will generate error 213 init ignored It can be disabled by sending INITiate CONTinuous OFF The RST command can also be used to disable continuous initiation It a...

Page 343: ...additional information res 0 1 i e 100 0 V 3 digits 0 01 i e 10 00 V 3 digits 0 001 i e 1 000 V 3 digits 0 0001 i e 1 0000 V 4 digits 0 00001 i e 1 00000 V 5 digits 0 000001 i e 1 000000 V 6 digits Th...

Page 344: ...command is sent the following commands execute in the order that they are presented ABORt CONFigure function READ When ABORt is executed the instrument goes into the idle state if con tinuous initiati...

Page 345: ...13 10 Model 2790 SourceMeter Switch System Reference Manual...

Page 346: ...MatandMiscellaneous SYSTemCommands FORMat commands Covers the SCPI commands to configure the format for readings that are sent over the bus Miscellaneous SYSTem commands Covers miscellaneous SYSTem co...

Page 347: ...LC2 DATA over the GPIB can be returned in either the ASCii or binary format All other queries are returned in ASCii regardless of the selected format Over the RS 232 interface only the ASCII format is...

Page 348: ...e 14 6 for information on the data elements Figure 14 1 also shows the byte order of the data string Data elements not specified by the ELEMents command are simply not included in the string Figure 14...

Page 349: ...locks Note that the data string for each reading conversion is preceded by a 2 byte header that is the binary equivalent of an ASCII sign and 0 Figure 14 2 does not show the byte for the terminator th...

Page 350: ...er Byte 4 Byte 3 Byte 2 Byte 1 The Header is only sent once for each measurement conversion A Single precision data format 32 data bits s 0 7 0 7 0 7 0 7 0 e f Header Byte 1 Byte 2 Byte 7 Byte 8 Bytes...

Page 351: ...Select timestamp type RELative or RTCL klqb The real time clock timestamp can only be returned for the ASCII data format For the binary formats timestamp will not be sent with the real time clock sel...

Page 352: ...d to its binary equivalent is1010 That means High Limit 2 and High Limit 1 have failed FORMat BORDer name Parameters NORMal Normal byte order for IEEE 754 binary format SWAPped Reverse byte order for...

Page 353: ...should be used with SYST PRES which is a slow responding command Details on OPC and OPC are provided in Section 12 SYSTem VERSion Read the version of the SCPI standard being used by Model 2790 Example...

Page 354: ...for limits and continuity tests However when limits or CONT is again selected the beeper will automatically enable Parameters b 0 Disable beeper 1 Enable beeper Figure 14 3 Key press codes 1 2 3 4 5...

Page 355: ...14 10 Model 2790 SourceMeter Switch System Reference Manual...

Page 356: ...15 SCPIReferenceTables...

Page 357: ...are used to indicate parameter type Do not use angle brackets in the program message The Boolean parameter b is used to enable or disable an instrument operation 1 or ON enables the operation and 0 or...

Page 358: ...Set m factor for mX b and m X b 4294967295 to 4294967295 1 1 MMFactor clist Query m factor 1 MA1Factor clist Query m factor 1 MBFactor NRf clist Set b factor for mX b and m X b 4294967295 to 42949672...

Page 359: ...uery state of limit outputs PULSe Path to control limit output pulsing STATe b Enable or disable limit output pulsing OFF STATe Query state of limit output pulsing TIME NRf Set output pulse time in se...

Page 360: ...A clist Query lower limit STATe b clist Enable or disable limit test OFF STATe clist Query state of limit test FAIL Query test result 1 failing CLEAR Path to clear events IMMediate Clear high and low...

Page 361: ...ON ENABle Query state of the display Note RST and SYSTem PRESet have no effect on commands in this subsystem The listed defaults are power on defaults Table 15 3 FORMat command summary Command Descrip...

Page 362: ...Nt clist Query closure count for specified channels Sec 2 INTerval NRf Set count update interval in minutes 10 to 1440 Note 3 INTerval Query relay count update interval CLOSe Returns a clist of closed...

Page 363: ...ery channel pattern for memory n SOURce LEVel n NRf clist Assign source values to channels Note 5 LEVEL n Query source values DELay n NRf Assign a variable delay to memory n Note 5 DELay n Query delay...

Page 364: ...COUNt Query Hold count STATe NRf Enable or disable Hold OFF STATe Query state of Hold CAVerage b clist Channel average calculation 7702 only Sec 5 DELay NRf clist Set delay between the two measurement...

Page 365: ...reference 1010 to 1010 0 Sec 5 STATe b clist Enable or disable reference OFF STATe clist Query state of reference ACQuire clist Use input signal as reference REFerence clist Query reference value AVE...

Page 366: ...7 5 0 Sec 5 STATe b clist Enable or disable reference OFF STATe clist Query state of reference ACQuire clist Use input signal as reference REFerence clist Query reference value AVERage Path to configu...

Page 367: ...ist Query resolution REFerence n clist Specify reference 3 1 to 3 1 0 Sec 5 STATe b clist Enable or disable reference OFF STATe clist Query state of reference ACQuire clist Use input signal as referen...

Page 368: ...0 Sec 5 STATe b clist Enable or disable reference OFF STATe clist Query state of reference ACQuire clist Use input signal as reference REFerence clist Query reference value AVERage Path to configure a...

Page 369: ...clist Query resolution REFerence n clist Specify reference 0 to 120e6 0 Sec 5 STATe b clist Enable or disable reference OFF STATe clist Query state of reference ACQuire clist Use input signal as refe...

Page 370: ...erence 0 to 120e6 0 Sec 5 STATe b clist Enable or disable reference OFF STATe clist Query state of reference ACQuire clist Use input signal as reference REFerence clist Query reference value AVERage P...

Page 371: ...erence ACQuire clist Use input signal as reference REFerence clist Query reference value AVERage Path to configure and control filter Sec 4 TCONtrol name Select filter type MOVing or REPeat Note 3 TCO...

Page 372: ...clist Query delta FREQuency Path to configure frequency Sec 3 APERture NRf clist Sets gate time for frequency measurements in seconds 0 01 to 1 0 1 0 Sec 4 APERture clist Query frequency gate time DI...

Page 373: ...threshold voltage range Sec 3 VOLTage RANGe n clist Select threshold range 0 to 1010 10 RANGe clist Query threshold range CONTinuity Path to configure continuity test Sec 3 THReshold NRf Set threshold...

Page 374: ...ist Set V source output 50 to 500 V clist 128 Slot 1 228 Slot 2 50 AMPLitude clist Query V source output level SOURce CURRent LEVel IMMediate AMPLitude NRf clist Set I source output 0 to 50 mA clist 1...

Page 375: ...egister CONDition Read the condition register PRESet Return status registers to default states QUEue Path to access error queue NEXT Read the most recent error message Note 4 ENABle list Specify error...

Page 376: ...le autozero ON STATe Query autozero LSYNc Path to control line synchronization Sec 3 STATe b Enable or disable line sync OFF STATe Query state of line sync LFRequency Query power line frequency Sec 1...

Page 377: ...annel Path to query isolated channels3 STARt Request lowest numbered isolated channel 0 isolated channels not supported END Request highest numbered isolated channel 0 isolated channels not supported...

Page 378: ...LOCal Take Model 2790 out of remote and restore opera tion of front panel controls RS 232 only Sec 10 REMote Place Model 2790 in remote RS 232 only Sec 10 RWLock Lockout front panel controls RS 232 on...

Page 379: ...an TRACe POINts value 50 NOTify Query trace notify value NEXT Query buffer location for next stored reading TSTamp Path to set timestamp format FORMat name Select timestamp format ABSolute or DELTa AB...

Page 380: ...easure count DELay n Set delay 0 to 999999 999 sec 0 AUTO b Enable or disable auto delay OFF AUTO Query state of delay DELay Query delay SOURce name Select control source IMMediate TIMer MANual BUS or...

Page 381: ...surement units V or DB V DB Path to set DB reference voltage REFerence n Specify reference in volts 1e 7 to 1000 1 REFerence Query reference DC clist Query DCV units AC name clist Select ACV measureme...

Page 382: ...es how the reading limits are calculated Performing the verification test procedures Outlines the type of tests and summarizes test considerations Model 2790 verification Provides all the procedures n...

Page 383: ...sentative or the factory to determine the correct course of action If the unit is not under warranty and it fails to meet specified limits refer to the calibration procedures in Section 17 There are t...

Page 384: ...internal temperature to stabilize Typically allow one extra hour to stabilize a unit that is 10 C 18 F outside the specified temperature range Also allow the test equipment to warm up for the minimum...

Page 385: ...5ppm 100V 7ppm 1000V 9ppm 100mV 200ppm 1 0V 82ppm 10V 82ppm 100V 90ppm 700V 85ppm 20mA 60ppm 100mA 70ppm 1A 110ppm 2 2A 94ppm 1A 690ppm 2 2A 682ppm 10 28ppm 19 26ppm 100 17ppm 1k 12ppm 10k 11ppm 100k...

Page 386: ...mits 9 99965V to 10 00035V Calculating resistance reading limits Resistance reading limits must be recalculated based on the actual calibration resistance values supplied by the equipment manufacturer...

Page 387: ...tiplexer Card Model 7751 7752 7753 verification use this procedure to verify accuracy of the sources of the Model 7751 7752 7753 cards Model 2790 tests Model 2790 verification test procedures include...

Page 388: ...ollowing safety precautions when performing these tests Some of the procedures in this section may expose you to danger ous voltages Use standard safety precautions when such danger ous voltages are e...

Page 389: ...PUTS switch is set to the FRONT position klqb Use shielded low thermal connections when testing the 100mV and 1V ranges to avoid errors caused by noise or thermal effects Connect the shield to the cal...

Page 390: ...verification tests 5 Source positive and negative and full scale voltages for each of the ranges listed in Table 16 2 For each voltage setting be sure that the reading is within stated limits Table 16...

Page 391: ...I and INPUT LO or 8 107 V Hz input because instrument damage may occur Follow these steps to verify AC voltage accuracy 1 Connect the Model 2790 HI and LO INPUT jacks to the AC voltage calibrator as s...

Page 392: ...f the 5725A amplifier is not available change the 700V 50kHz step to 220V 50kHz Reading limits for 220V 50kHz 219 36 to 220 64V F F Model 2790 SourceMeter Switch System RANGE F 500V PEAK FRONT REAR 3A...

Page 393: ...rrent verification Table 16 4 DCI limits DCI range Applied DC current Reading limits 1 year 18 C to 28 C 20mA 100mA 1A 3A 20 0000mA 100 0000mA 1 000000A 3 000000A 19 9892 to 20 01080mA 99 9100 to 100...

Page 394: ...e AC currents as summarized in Table 16 5 and verify that the readings are within stated limits Table 16 5 ACI limits ACI range Applied AC current Reading limits 1kHz 1 year 18 C to 28 C 1A 3A 1 00000...

Page 395: ...with the RATE key 4 Set the Model 2790 for the 100 range and make sure the FILTER is on Enable OCOMP offset compensated ohms by pressing SHIFT then OCOMP Use OCOMP for 100 range verification 5 Recalc...

Page 396: ...to __________ k __________ to __________ k __________ to __________ M __________ to __________ M __________ to __________ M Enable O COMP offset compensated ohms when testing 100 range Calculate limi...

Page 397: ...S switch is in the FRONT position 2 Configure the Model 2790 temperature function for C units and RTD temperature sensor 0 00385 as follows a Press SHIFT then SENSOR Note the unit displays the tempera...

Page 398: ...790 frequency reading is between 999 9Hz and 1 0001kHz Figure 16 7 Connections for Model 2790 frequency verification F F Model 2790 SourceMeter Switch System RANGE F 500V PEAK FRONT REAR 3A 250V AMPS...

Page 399: ...o verify DC voltage accuracy 1 Connect the Model 7702 CH1 H and L INPUT terminals to the DC voltage calibra tor as shown in Figure 16 8 klqb Use shielded low thermal connections when testing the 100mV...

Page 400: ...the DC volts verification tests 6 Source positive negative and full scale voltages for each of the ranges listed in Table 16 8 For each voltage setting be sure that the reading is within stated limit...

Page 401: ...y 1 Connect the Model 7702 CH1 H and L INPUT terminals to the AC voltage calibrator as shown in Figure 16 9 Figure 16 9 Connections for Model 7702 AC volts verification 2 Install the Model 7702 in Slo...

Page 402: ...o the calibrator as shown in Figure 16 10 Figure 16 10 Connections for Model 7702 DC current verification Table 16 9 Model 7702 ACV reading limits ACV range Applied AC voltage 1kHz reading limits 1 ye...

Page 403: ...1 5 Source positive and negative full scale currents for each of the ranges listed in Table 16 10 and verify that the readings for each range are within stated limits 6 Press the OPEN key to open Chan...

Page 404: ...o warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the AC current function by pressing the ACI key 4 Set the Model 2790 for the 1A ran...

Page 405: ...resistance verification 100 to 10M ranges 2 Install the Model 7702 in Slot 1 of the Model 2790 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front p...

Page 406: ...resistance verification Range Nominal resistance Nominal reading limits 1 year 18 C to 28 C Recalculated limits 100 1k 10k 100k 1M 10M 100M 100 1k 10k 100k 1M 10M 100M 99 9880 to 100 0120 0 999894 to...

Page 407: ...the front panel INPUTS switch is set to the REAR position 3 Select the temperature function by pressing the TEMP key Close Channel 1 by pressing the CLOSE key and keying in 101 4 Configure the Model 2...

Page 408: ...the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Set the function generator to output a 1kHz 1V RMS sine wave 4 Select the Model...

Page 409: ...lect the Model 2790 DCV function and the 1V range Close Channel 1 by pressing the CLOSE key and keying in 101 4 Select the Model 2790 RATIO function press SHIFT then RATIO 5 Set the calibrator output...

Page 410: ...njury due to electrical shock Table 16 14 Recommended equipment for Model 7751 7752 7753 verification Keithley Model 2001 Digital Multimeter 1 500V 47ppm HP3458A Digital Multimeter 50mA 35ppm Fluke 57...

Page 411: ...DMM DC amps function and enable autorange 4 Set the Model 7751 7752 7753 source current to 50mA as follows a Press SHIFT CARD then CONFIG b Select SLOT1 7751 SLOT1 7752 or SLOT1 7753 then press ENTER...

Page 412: ...ss SHIFT CARD then CONFIG b Select SLOT1 7751 or SLOT1 7753 then press ENTER c Select the V C submenu then set the source to 500V d Press EXIT to return to normal display 5 Verify that the DMM reading...

Page 413: ...to the REAR position 3 Select the Model 2790 DC volts function and enable autorange 4 Set calibrator output current to 50 A 7751 or 500 A 7753 and turn on its output 5 Using the CLOSE key close channe...

Page 414: ...gure 16 19 2 Install the Model 7751 7752 7753 in Slot 1 of the Model 2790 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is...

Page 415: ...ce value 7 Verify that the resistance reading is within the limits calculated in step 6 8 Repeat steps 1 through 7 for the 20mA 10mA and 1mA source currents as shown in Table 16 15 using the indicated...

Page 416: ...ble 16 16 7751 or Table 16 17 7753 for resistance values 2 Install the Model 7751 7753 in Slot 1 of the Model 2790 then turn on the power and allow the unit to warm up for two hours before proceeding...

Page 417: ...16 17 7753 based on the actual characterized resistance value 7 Verify that the resistance reading is within the limits calculated in step 6 8 Repeat steps 1 through 7 for the remaining resistances a...

Page 418: ...0V 50V 50V 50V 1G 100M 10M 100M 10M 1M 0 92282 to 1 07717G 98 186 to 101 814M 9 8585to 10 1415M 88 541 to 111 459M 9 4048 to 10 5952M 0 94747 to 1 05253M __________ to __________ __________ to _______...

Page 419: ...16 38 Model 2790 SourceMeter Switch System Reference Manual...

Page 420: ...ck calibration both from the front panel and via remote using the calibration code Comprehensive calibration Covers all the calibration steps necessary to calibrate all Model 2790 functions Manufactur...

Page 421: ...r over the IEEE 488 bus or the RS 232 port DC only and AC only calibration may be performed individually if desired Environmental conditions Conduct the calibration procedures in a location that has A...

Page 422: ...tests Some of the procedures in this section may expose you to dangerous voltages Use standard safety precautions when such dangerous voltages are encountered to avoid personal injury or death caused...

Page 423: ...ry default code is 002790 Use the left and right arrow keys to move among the digits use the up range key to increment numbers and press the down range key to specify alphabetic letters Confirm the co...

Page 424: ...AC only calibration procedures You can use alternate equipment such as a DC transfer standard and characterized resistors as long as that equipment has specifications equal to or better than those li...

Page 425: ...calibration DC voltage calibration Resistance calibration DC current calibration AC voltage calibration AC current calibration Setting calibration dates Preparing the Model 2790 for calibration 1 Turn...

Page 426: ...erminals Keep drafts away from low thermal connections to avoid thermal drift which could affect calibration accuracy 2 Press ENTER to start short circuit calibration While the unit is calibrating it...

Page 427: ...sense leads are connected and dis connected at various points in this procedure by turning calibrator external sense on or off as appropriate If your calibrator does not have provisions for turning e...

Page 428: ...ey to calibrate that step Wait until the Model 2790 finishes each step The unit will display the CALIBRATING message while calibrating klqb If your calibrator cannot output the values recommended in T...

Page 429: ...ator cannot output the exact resistance value use the Model 2790 left and right arrow keys and the range keys to adjust the Model 2790 display to agree with the actual calibrator resistance Press the...

Page 430: ...e 17 5 DC current calibration summary Calibration step Calibrator current Allowable range 10mA 100mA 1A 10 00000mA 100 0000mA 1 000000A 9mA to 11mA 90mA to 110mA 0 9A to 1 1A F F Model 2790 SourceMete...

Page 431: ...at 1kHz 100mV AC at 1kHz 100mV AC at 50kHz 1V AC at 1kHz 1V AC at 50kHz 10V AC at 1kHz 10V AC at 50kHz 100V AC at 1kHz 100V AC at 50kHz 700V AC at 1kHz 10 00000mV 1kHz 100 0000mV 1kHz 100 0000mV 50kHz...

Page 432: ...er the calibration date and the calibration due date Set these dates as follows 1 At the CAL DATE prompt use the left and right arrow keys and the range keys to set the calibration date then press ENT...

Page 433: ...e calibration DC current calibration AC volts calibration AC current calibration Programming calibration dates Saving calibration constants Locking out calibration klqb As with front panel calibration...

Page 434: ...tton is not pressed in so that the front inputs are active Wait at least three minutes before proceeding to allow for thermal equilibrium klqb Be sure to connect the low thermal short properly to the...

Page 435: ...ration steps summarized in Table 17 8 For each step Set the calibrator to the indicated voltage and make sure the unit is in operate Use the recommended voltage if possible Send the indicated programm...

Page 436: ...d make sure the unit is in operate Use the recommended resistance or the closest available value Send the indicated programming command Change the command parameter if you are using a different calibr...

Page 437: ...orming DC only calibration proceed to Programming calibra tion dates AC voltage calibration Follow these steps for AC voltage calibration 1 Connect the calibrator to the Model 2790 INPUT HI and LO ter...

Page 438: ...on step Calibrator voltage frequency Calibration command 10mV AC at 1kHz 100mV AC at 1kHz 100mV AC at 50kHz 1VAC at 1kHz 1VAC at 50kHz 10VAC at 1kHz 10VAC at 50kHz 100VAC at 1kHz 100VAC at 50kHz 700VA...

Page 439: ...command is sent Locking out calibration After saving calibration send the following command to lock out calibration CAL PROT LOCK Manufacturing calibration The manufacturing calibration procedure is...

Page 440: ...Extender Test Board should then be installed in scanner Slot 1 Test equipment connections Connections for steps requiring the calibrator are shown in Figure 17 5 and Figure 17 6 shows function generat...

Page 441: ...E INPUTS 350V PEAK 1000V PEAK AUTO SHIFT LOCAL POWER RANGE R EXIT ENTER DIGITS RATE REL FILTER TRIG EX TRIG STORE RECALL OPEN DCV DCI MATH OUTPUT RATIO ACV ACI 2 4 FREQ TEMP CH AVG CONT PERIOD SENSOR...

Page 442: ...ror is reported after performing this step refer to Table 17 14 for troubleshooting Frequency cal Connect the function generator to the front panel INPUT jacks Figure 17 6 Set the generator to output...

Page 443: ...TEP15 1E3 11 Send the following commands to set calibration dates save calibration and lock out calibration CAL PROT DATE yyyy mm dd CAL PROT NDUE yyyy mm dd CAL PROT SAVE CAL PROT LOCK Calibration fo...

Page 444: ...al Set the function generator to output a 1V RMS 1kHz sine wave Enter 1 000000kHz at the prompt then press ENTER 9 Set the calibration dates then save calibration to complete the process Remote manufa...

Page 445: ...d 7753 modules the maximum common mode voltage voltage between any module terminal and chassis ground is 42V Exceeding this value may cause a breakdown in insulation creating a shock hazard klqb The s...

Page 446: ...arm up period before proceeding 5 Enable calibration by sending the CODE command For example the default command is CAL PROT CODE KI002790 6 Initiate calibration by sending the following command CAL P...

Page 447: ...NSE SRC HI SRC HI HI SRC HI SRC SRC LO SRC LO LO SRC LO SRC SEN HI SEN HI HI SEN HI SEN SEN LO SEN LO LO SEN LO SEN A A A A LO I V GUARD ISOURCE VSOURCE INTERLOCK OUT HI GND GND HI IN LO LO BANK 1 BAN...

Page 448: ...amps fuses Discusses the method for replacing the two fuses that protect the Model 7702 current inputs Replacing Model 7751 7752 7753 plug in module fuses Discusses the method for replacing the four...

Page 449: ...ement perform the following steps 1 Place the tip of a flat blade screwdriver into the power module by the fuse holder assembly see Figure 18 1 Gently push in and to the left Release pressure on the a...

Page 450: ...200 240V 1 4A 250V 5 20 mm slow blow FU 96 4 KEITHLEY SLOT COVER DIGITAL I O TRIG LINK RS232 WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FOR CONTINUED PRO...

Page 451: ...e it with the same type 3A 250V fast blow Keithley part number FU 99 1 rqflk Do not use a fuse with a higher current rating than specified or instru ment damage may occur If the instrument repeatedly...

Page 452: ...o so Make sure that all plug in module connections are de energized and disconnected before replacing module amps fuses 1 Turn off the power and disconnect external connections from the Model 7702 2 O...

Page 453: ...g in module fuses t okfkd The information in this section is intended only for qualified service personnel Do not perform these procedures unless you are qualified to do so Make sure that all plug in...

Page 454: ...cuit board with a foam tipped swab or brush dipped in pure water then blow dry the board with dry nitrogen gas Allow the board to dry for several hours in a 50 C low humidity environment before use 9...

Page 455: ...ded only for qualified service person nel Do not perform this procedure unless you are qualified to do so Disconnect the line cord and all connecting wires from the Model 2790 before removing the top...

Page 456: ...before use 7 Re install the top cover Plug in module relay closure count The Model 2790 keeps an internal count of the number of times each module relay has been closed This count will help you deter...

Page 457: ...relay closure count klqb The Model 2790 must be in the manufacturing calibration mode to reset the closure count To do so press and hold the OPEN key while turning on the power then send the CAL PROT...

Page 458: ...ften may reduce scanning throughput The higher the interval the less scanning throughput is reduced but more relay counts may be lost in the event of a power failure To set the count update interval s...

Page 459: ...SP 3 Press ENTER to start the test There are five parts to the display test Each time ENTER is pressed the next part of the test sequence is selected The five parts of the test sequence are as follows...

Page 460: ...SourceMeter Switch System including the specifications for the Models 7751 7752 and 7753 modules Ohms specification calculations 7751 7752 7753 Provides equations to calculate ohms specifications for...

Page 461: ...A 2 Specifications Model 2790 SourceMeter Switch System Reference Manual...

Page 462: ...Model 2790 SourceMeter Switch System Reference Manual Specifications A 3...

Page 463: ...A 4 Specifications Model 2790 SourceMeter Switch System Reference Manual...

Page 464: ...Model 2790 SourceMeter Switch System Reference Manual Specifications A 5...

Page 465: ...A 6 Specifications Model 2790 SourceMeter Switch System Reference Manual...

Page 466: ...Model 2790 SourceMeter Switch System Reference Manual Specifications A 7...

Page 467: ...ent of reading plus an ohms offset 7751 7752 7753 I source Low ohms specifications using the I source of the 7751 7752 7753 are provided for the following current output settings 50mA 20mA 10mA and 1m...

Page 468: ...e temperature coefficient for an I source setting of 30mA of reading 0 001 0 025 30 C 0 001 0 00083 0 00183 C Ohms offset 0 001 30 C 0 033m C Ohms temperature coefficient 30mA 0 00183 0 033m C 7751 77...

Page 469: ...ltage source settings Figure A 2 Model 7753 measurement uncertainty for various voltage source settings 0 1 1 0 10 0 Resistance Under Test Uncertainty 50 100 200V 500V 300V 400V Voltage Source Setting...

Page 470: ...C For measurements 10M to 100M TC of reading 0 02 6 VSOURCE C TC ohms offset 200 C where VSOURCE is the voltage output setting in volts Example Determine temperature coefficient for a V source settin...

Page 471: ...A 12 Specifications Model 2790 SourceMeter Switch System Reference Manual...

Page 472: ...B StatusandErrorMessages...

Page 473: ...ram currently running Illegal program name Cannot create program Expression error Hardware missing Data corrupt or stale Out of memory Illegal parameter value Too much data Parameter data out of range...

Page 474: ...ny digits Exponent too large Invalid character in number Numeric data error Header suffix out of range Undefined header Program mnemonic too long Header separator error Command header error Missing pa...

Page 475: ...running Waiting in trigger layer Re entering the idle layer Filter settled Reading overflow Low limit 1 event High limit 1 event Low limit 2 event High limit 2 event Reading available Buffer user sel...

Page 476: ...k 4 w zero error 10k 4 w zero error 100k 4 w zero error 10M 4 w sense lo zero error 1k 4 w full scale error 10k 4 w full scale error 100k 4 w full scale error 1M 4 w full scale error 10M 4 w full scal...

Page 477: ...or 1V 10Hz amplitude error Frequency gain error 1K Ohm loff Ocomp FS error 10K Ohm loff Ocomp FS error Temperature Cold Cal error Analog output zero error Analog output positive gain error Analog outp...

Page 478: ...ard memory pattern mismatch Questionable calibration Questionable temperature Invalid function in chanlist Memory pattern full No measurement channel in scanlist RS 232 Framing error detected RS 232 O...

Page 479: ...B 8 Model 2790 SourceMeter Switch System Reference Manual...

Page 480: ...nal processing information instrument features and defines processing using Ratio or Channel Average Data flow remote operation Defines data flow for remote operation Defines specific commands Provide...

Page 481: ...2790 Based on the selected measurement function and range signal conditioning transforms the input signal into a DC voltage that is applied to the A D converter The A D Conversion Process measures th...

Page 482: ...through to the next enabled feature or to the display Figure C 2 Signal processing using instrument features Input Signal Rel Math mX b m X b Percent SxIohms or SxVohms Rel ed reading Reading Rel valu...

Page 483: ...of readings to be averaged In general for the moving filter each measurement process adds a reading to the stack oldest reading discarded and then averages the stack to yield a filtered reading For th...

Page 484: ...fied and is the reading that is displayed on the Model 2790 With Limits enabled the reading is tested against two sets of high and low limits Along with the displayed reading annunciators and messages...

Page 485: ...s and that reading is used as the Chan B value for the calcu lation Ratio or Ch Avg is then calculated as shown in Figure C 3 As shown the result of Ratio or Ch Avg can then be used by an enabled Math...

Page 486: ...or this triggering configura tion is summarized by the block diagram shown in Figure C 4 Refer to this block diagram for the following discussion Figure C 4 Data flow for remote operation SENSe Measur...

Page 487: ...disables continuous initiation and TRIGger COUNt 1 configures the instrument to perform one measurement cycle The INIT command can then be used to initiate the measurement cycle When the INIT command...

Page 488: ...arrays Reading numbers that do not change will indicate that the same data array is being returned klqb The FORMat ELEMents command see Section 14 is used to include the reading number RNUM element i...

Page 489: ...te that FETCh does not affect data in the sample buffer Therefore subsequent execu tions of FETCh acquire the same data klqb When an instrument setting that is relevant to the readings in the sample b...

Page 490: ...do not affect data in the sample buffer Therefore subsequent executions of these commands return the same data With no math function enabled these commands return the last data array stored in the sam...

Page 491: ...be returned when a read operation CALC2 IMM or CALC2 DATA is performed However if there was no calculation previously performed the number 9 910000E 37 will instead be returned Continuous measurement...

Page 492: ...Once the scan is properly configured INIT or READ will start the scan READ also returns the scanned readings data arrays from the sample buffer or the CALC1 block if Math is enabled FETCh will not st...

Page 493: ...C 14 Model 2790 SourceMeter Switch System Reference Manaul...

Page 494: ...rement considerations Provides information on thermoelectric poten tials thermoelectric generation minimizing thermal EMFs source resistance noise magnetic fields radio frequency interference ground l...

Page 495: ...w Level Measurements handbook which is available from Keithley Thermoelectric potentials Thermoelectric potentials thermal EMFs are small electric potentials generated by differences in temperature at...

Page 496: ...B junction C or K T2 Temperature of A junction C or K In the unlikely event that the two junction temperatures are identical no thermal EMFs will be generated More often the two junction temperatures...

Page 497: ...e the connection is gas tight to prevent future oxidation In some cases connecting the two thermal junctions together with good thermal contact to a common heat sink may be required Unfortunately most...

Page 498: ...ance of 10k the noise over a 0 5Hz bandwidth at room temperature will be Minimizing source resistance noise From the above examples it is obvious that noise can be reduced in several ways 1 lower the...

Page 499: ...s Radio frequency interference RFI Radio Frequency Interference is a general term used to describe electromagnetic interference over a wide range of frequencies across the spectrum Such RFI can be par...

Page 500: ...urn path such as power line ground As shown in Figure D 2 the resulting ground loop causes current to flow through the instrument LO signal leads and then back through power line ground This circulati...

Page 501: ...is connected to power line ground Ground loops are not normally a problem with instruments like the Model 2790 that have isolated LO terminals However all instruments in the test setup may not be des...

Page 502: ...level measurement situation Otherwise interference from such noise sources as line frequency and RF fields can seriously corrupt measure ments rendering experimental data virtually useless In order t...

Page 503: ...the input resistance of the Model 2790 is RI and the voltage measured by the nanovoltmeter is VM Figure D 5 Meter loading The voltage actually measured by the meter is attenuated by the voltage divide...

Page 504: ...ocuments the Steinhart Hart equation which is used to calculate thermistor temperature RTD equation Documents the Callendar Van Dusen equation which is used to calculate the temperature vs resistance...

Page 505: ...stor temperature measurement accuracy of the Model 2790 see Appendix A is based on the curve fitting constants listed in Table E 1 If the thermistor manufacturer s curve fitting constants are not exac...

Page 506: ...re T C is the temperature in C TK is the calculated Kelvin temperature Example Calculate the temperature for a Series 44007 thermistor that measures 5k R lnR ln 5000 8 5172 A 0 001288 B 0 0002356 C 9...

Page 507: ...stance of a PT100 RTD at 100 C T The following R0 at 0 C alpha beta and delta values are used for the PT100 RTD Table E 2 T 100 C R0 at 0 C 100 alpha 0 003850 beta 0 10863 delta 1 49990 Using the abov...

Page 508: ...Switch System Reference Manual E 5 The resistance of the RTD at 100 C R100 is then calculated as follows R100 R0 1 AT BT2 CT3 T 100 100 1 0 00391 100 5 77e 7 1002 4 18e 12 1003 100 100 100 1 0 391 0...

Page 509: ...E 6 Model 2790 SourceMeter Switch System Reference Manual...

Page 510: ...F IEEE 488BusOverview...

Page 511: ...on transfer since the task of listening takes up bus time Through the use of control lines a handshake sequence takes place in the transfer process of information from a talker to a listener This hand...

Page 512: ...truments on the bus The talker sends data while a listener receives data Depending on the type of instrument any particular device can be a talker only a listener only or both a talker and listener Fi...

Page 513: ...n a similar manner the talk address is obtained by ORing the primary address with 40 With the present example the talk address derived from a primary address of 16 would be 56 56 16 40 The IEEE 488 st...

Page 514: ...wo lines are controlled by accepting devices the listener or lis teners receiving the information The three handshake lines are DAV DATA VALID The source controls the state of the DAV line to indicate...

Page 515: ...aphs Figure F 2 IEEE 488 handshake sequence Bus commands The instrument may be given a number of special bus commands through the IEEE 488 interface The following paragraphs briefly describe the purpo...

Page 516: ...lengths to be transmitted easily IFC Interface Clear IFC is used to clear the interface and return all devices to the talker and listener idle states Table F 1 IEEE 488 bus command summary Command ty...

Page 517: ...oller to remove all devices on the bus from the serial poll mode and is generally the last command in the serial polling sequence Addressed multiline commands Addressed commands are multiline commands...

Page 518: ...UNL Unlisten Listeners are placed in the listener idle state by the UNL command UNT Untalk Any previously commanded talkers will be placed in the talker idle state by the UNT command Common commands C...

Page 519: ...nes are summarized in Figure F 3 Hexadecimal and the decimal values for the various commands are listed in Table F 2 Table F 2 Hexadecimal and decimal command codes Command Hex value Decimal value GTL...

Page 520: ...C1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US LLO DCL PPU SPE SPD 1 B 2 A SP _ 2 B 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 3 A 0 1 2 3 4 5 6 7 8 9 3 B 16 17 18 19 20 21 22 23 24 25 26 27 28 29 3...

Page 521: ...sent Note that ATN is true for both the listen command and the SDC command byte itself Table F 4 gives a typical common command sequence In this instance ATN is true while the instrument is being addr...

Page 522: ...ATA VALID UNIVERSAL COMMAND GROUP ATN ATTENTION DCL DEVICE CLEAR IFC INTERFACE CLEAR REN REMOTE ENABLE SPD SERIAL POLL DISABLE SPE SERIAL POLL ENABLE ADDRESS COMMAND GROUP LISTEN TALK LAG LISTEN ADDRE...

Page 523: ...s T5 exist only after the instrument has been addressed to talk L Listener Function The ability for the instrument to receive device dependent data over the bus from other devices is provided by the L...

Page 524: ...ialized DT Device Trigger Function DTI defines the ability of the Model 2790 to have readings triggered C Controller Function The instrument does not have controller capabilities C0 E Bus Driver Type...

Page 525: ...F 16 Model 2790 SourceMeter Switch System Reference Manual...

Page 526: ...G CalibrationReference...

Page 527: ...this subsystem are protected by the calibration lock except queries and CODE CODE up to 8 char string Calibration code or password default KI002790 COUNt Request the number of times the unit has been...

Page 528: ...AC at 1kHz step STEP7 10V AC at 50kHz step STEP8 100V AC at 1kHz step STEP9 100V AC at 50kHz step STEP10 700V AC at 1kHz step STEP11 100mA AC at 1kHz step STEP12 1A AC at 1kHz step STEP13 2A AC at 1kH...

Page 529: ...t to the unit before sending any other comprehensive or manufacturing calibration command The default calibration code is KI002790 klqb The CODE command should be sent only once before performing eith...

Page 530: ...ore performing either DC AC or factory calibration Do not send INIT before each calibration step Example CAL PROT INIT Initiate calibration LOCK CALibration PROTected LOCK Purpose To lock out comprehe...

Page 531: ...K Request cal lock state SAVE CALibration PROTected SAVE Purpose To save calibration constants in EEROM after the calibration procedure Format cal prot save Parameters None Description The SAVE comman...

Page 532: ...he CALIBRATION selection in the front panel CAL menu Example CAL PROT DATE 2002 3 16 Send cal date 3 16 2002 CAL PROT DATE Request cal date NDUE CALibration PROTected NDUE Purpose To send the next cal...

Page 533: ...put jacks before sending this command Example CAL PROT DC STEP1 Perform short circuit calibration Table G 2 DC calibration commands Command Description Parameter limits CALibration PROTected DC STEP1...

Page 534: ...hensive calibration step Format cal prot dc step3 Cal_voltage Parameters Cal_voltage 9 to 11 V Description STEP3 programs the 10V DC comprehensive calibration step The allowable range of the calibrati...

Page 535: ...ormat cal prot dc step6 Cal_resistance Parameters Cal_resistance 0 9E3 to 1 1E3 Description STEP6 programs the 1k 4 wire resistance comprehensive calibration step The allowable range of the calibratio...

Page 536: ...n step Format cal prot dc step9 Cal_resistance Parameters Cal_resistance 900E3 to 1 1E6 Description STEP9 programs the 1M comprehensive calibration step The allow able range of the calibration resista...

Page 537: ...t parameter is from 90E 3 to 110E 3 Use the 100E 3 value whenever possible for best results Example CAL PROT DC STEP11 0 1 Program 100mA step STEP12 CALibration PROTected DC STEP12 Purpose To program...

Page 538: ...10mV AC at 1kHz calibration step STEP2 100mV AC at 1kHz calibration step STEP3 100mV AC at 50kHz calibration step STEP4 1V AC at 1kHz calibration step STEP5 1V AC at 50kHz calibration step STEP6 10V A...

Page 539: ...at 1kHz calibration step 7 10V AC at 50kHz calibration step 8 100V AC at 1kHz calibration step 9 100V AC at 50khz calibration step 10 700V AC at 1kHz calibration step 11 100mA AC at 1kHz calibration s...

Page 540: ...n The AC STEP14 and AC STEP 15 commands program the two manufacturing AC calibration steps The appropriate signal must be connected to the instrument when programming each step as summa rized by the p...

Page 541: ...queries and CODE CODE up to 8 char string Send calibration code Default KI002790 CARD1 Path to calibrate card in slot 1 INITiate Initiate card calibration COUNt Request number of times card in slot 1...

Page 542: ...002790 klqbp The CODE command should be sent only once before performing calibration Do not send CODE before each calibration step The code parameter must be enclosed in single quotes Example CAL PROT...

Page 543: ...klqb The card calibration date is automatically set to the Model 2790 real time clock date when the card is calibrated Example CAL PROT CARD1 DATE 1 Request card 1 cal date INIT CALibration PROTected...

Page 544: ...Purpose To read Model 7751 7752 7753 calibration lock status Format cal prot card1 lock Response 0 Calibration locked 1 Calibration unlocked Description The LOCK query requests status from the Model 2...

Page 545: ...ading should be recorded The Isource DAC will be set to 0 8 65536 or 52429 DATA NRf NRf sends the two readings from the DMM for the low and high points for the Isource readings The first parameter is...

Page 546: ...nd stores calculated calibration constants derived during Model 7751 7752 7753 calibration in card EEROM EEROM is non volatile memory Calibration constants will be retained indefinitely once saved Gen...

Page 547: ...r number Error message 400 10 vdc zero error 401 100 vdc zero error 402 10 vdc full scale error 403 10 vdc full scale error 404 100 vdc full scale error 405 100 vdc full scale error 406 1k 2 w zero er...

Page 548: ...ero error 463 100 vac full scale error 464 750 vac zero error 465 750 vac full scale error 466 750 vac noise error 467 Post filter offset error 468 1 aac zero error 469 1 aac full scale error 470 3 aa...

Page 549: ...send the following command SRE 4 This command will enable SRQ when the EAV bit is set You can then read the status byte and error queue as outlined above to check for errors and to determine the exac...

Page 550: ...appear on the same line as the calibration command 3 After sending a calibration command repeatedly test the ESB Event Summary bit bit 5 in the status byte until it is set Use either the STB query or...

Page 551: ...cables Keithley Model 7007 Software requirements In order to use the calibration program you will need the following software Microsoft QBasic supplied with MS DOS 5 0 or later MS DOS version 5 0 or l...

Page 552: ...e Model 2790 is set for a primary address of 16 Use the front panel GPIB key to check or change the address 4 Make sure the calibrator primary address is at its factory default setting of 4 5 Make sur...

Page 553: ...output C CAL PROT 2790 partial command header CLS Clear CRT PRINT Model 2790 Multimeter Comprehensive Calibration Program PRINT 1 OUTPUT 16 CAL PROT CODE KI002790 Send KI002790 cal code PRINT 1 OUTPUT...

Page 554: ...6 CAL PROT SAVE Save calibration constants GOSUB ErrCheck PRINT 1 OUTPUT 16 CAL PROT LOCK Lock out calibration PRINT Calibration completed PRINT 1 OUTPUT 16 SYST PRES END KeyCheck Check for key press...

Page 555: ...C STEP2 DATA OUT 10 V 0 HZ DC STEP3 10 DATA OUT 10 V DC STEP4 10 DATA OUT 100 V DC STEP5 100 DATA OUT 1 KOHM DC STEP6 DATA OUT 10 KOHM DC STEP7 DATA OUT 100 KOHM DC STEP8 DATA OUT 1 MOHM DC STEP9 DATA...

Page 556: ...31 schematic 2 32 Switching module capabilities 2 31 A AC calibration commands G 13 AC current verifying Model 2790 16 13 AC voltage verifying Model 2790 16 10 verifying Model 7702 16 20 AC voltage of...

Page 557: ...52 17 26 Model 7751 7752 17 27 preparing the Model 2790 17 6 recommended equipment 17 5 resistance 17 10 setting dates and saving 17 13 step completion G 24 calibration code front panel 17 4 remote 17...

Page 558: ...OPT 12 5 RCL 12 6 RST 12 6 SAV 12 6 SRE 11 9 SRE 11 9 STB 11 9 TRG 12 7 TST 12 7 Common errors 3 11 Connections 2 wire system channel 2 8 4 wire RTDs 3 24 4 wire system channel 2 9 AC volts calibratio...

Page 559: ...ming 5 23 Scanning 5 23 DC calibration commands G 8 DC current verifying Model 2790 16 12 verifying Model 7702 16 21 DC voltage Verifying Model 2790 16 8 verifying Model 7702 16 18 DCI and ACI connect...

Page 560: ...nnel average programming examples 5 22 Read error queue 11 22 Rel programming examples 5 6 Scanning 7 33 Scanning programming example 7 33 Serial poll programming example 11 10 Set MSS B6 when error o...

Page 561: ...d groups F 13 IEEE 488 Bus configuration F 3 Bus overview F 1 Connector 1 12 10 4 IEEE 488 2 common commands see Common commands IEEE 754 single precision format 14 4 Inputs Front panel 1 11 1 25 INPU...

Page 562: ...quipment 17 21 remote 17 23 17 25 Unlocking manufacturing calibration 17 21 Math 5 7 Basic operation 5 14 Commands 5 15 mX b 5 8 5 9 Percent 5 11 Percent reference 5 16 Programming examples 5 17 Remot...

Page 563: ...s 1 3 Output trigger 7 10 8 5 P Paired channels see 4 wire functions Percent math function 5 11 Configuration 5 11 Reference 5 16 Performance considerations 3 4 Plug in switching modules 1 3 1 6 Power...

Page 564: ...us byte and service request SRQ Status byte register 11 7 Status register sets 11 2 11 12 Relative 5 2 Basic operation 5 2 commands 5 4 Pressing REL using rel commands 5 6 Programming examples 5 6 Rem...

Page 565: ...uration 7 20 Basic scan 7 21 Buffer 7 22 Configuration 7 10 dB 5 23 Digital outputs 9 12 Digits 4 6 Examples 7 33 External trigger scan example 7 34 Filter 4 17 Fundamentals 7 2 Limits 9 4 Manual exte...

Page 566: ...wire functions 2 7 4 wire functions paired channels 2 8 SYSTem commands 14 8 SYSTem BEEPer STATe b 14 9 SYSTem KEY NRf 14 8 SYSTem PRESet 14 8 SYSTem VERSion 14 8 T Temperature Best temperature senso...

Page 567: ...2 16 28 Verification limits 16 5 Verification test considerations 16 7 Model 2790 16 6 Model 7702 16 6 summary 16 6 verification test procedures 16 6 Verification test requirements 16 2 verifying AC c...

Page 568: ...ll other trademarks and trade names are the property of their respective companies A G R E A T E R M E A S U R E O F C O N F I D E N C E Keithley Instruments Inc Corporate Headquarters 28775 Aurora Ro...

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