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Index

A

airbag inflators

  1-2

B

Bridgewire test

  1-8

bus programming

  2-8,  2-11

C

Cable discharge

  2-4

circuit

  2-17,  2-18

Cabling requirements

  4-3

Card configuration

Model 7702

  3-3

Models 7751 and 7752

  2-2

Channel assignments

Model 7702

  3-9

Channels

closing

Model 7702

  3-9

Model 7751/7752

  2-13

Numbering

  2-13,  3-9

CLOSE key

  3-10,  5-2

Command Sequence

bridgewire

  5-15

contact checks

  5-20,  5-21,  5-31,  5-33

HIPOT

  5-26

shunt bar

  5-13

V-source readback

  5-23

Commands

Multiple channel control

  2-8,  2-12,  2-14, 

 3-11,  6-5

Connection log

Model 7702

  3-8

Model 7751/7752

  2-19

Connections and wiring

  4-2

Contact checks

  1-10

D

discharge circuit

  2-17

dual inflator

  1-4

E

Errors (-241, +870)

  2-12

F

Front Panel

  3-10

Open interlock errors

  5-10

operation

  2-11

message

  2-16

opening and closing channels

  2-13

view closed channels

  2-15

remote programming test procedures

  5-2

test procedure

bridgewire

  5-15

contact checks

   5-20,   5-21,   5-31,

 5-33

HIPOT

  5-26

shunt bar

  5-13

V-source readback

  5-23

Fuse

  6-2

G

GPIB

  1-5,  5-4

Guarding

  4-9

H

Hardware missing

  2-12

High ohms

calculation

  2-10

math function

  1-10

I

I/V converter terminals

  2-6

Inflator tests

  1-6

Installation

  4-1,  4-10

installation

  4-10

Insulation resistance

  1-2

Model 7751

  5-17

Insulation resistance (HIPOT) test

  1-9

Interlock

  1-6,  2-5

interlock errors

  2-16

Invalid current error

  2-12

I-source

output levels

  2-6

readback

  1-8

L

leakage resistance

  1-9

Low ohms calculation

  2-9

Summary of Contents for 2790

Page 1: ...Model 2790SourceMeter Switch System User s Manual 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...

Page 2: ...Model 2790 SourceMeter Switch System User s Manual 2002 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Third Printing September 2003 Document Number 2790 900 01 Rev C...

Page 3: ...e numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each new Revision includes a...

Page 4: ...ted to mains voltage or to voltage sources with high transient over voltages Measurement Category II connections require protection for high transient over voltages often as sociated with local AC mai...

Page 5: ...ages The symbol indicates a connection terminal to the equipment frame The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated informa...

Page 6: ...annels 13 and 25 2 5 Interlock J106 2 5 General purpose terminal blocks J105 J107 and J108 2 5 Safety warnings 2 6 Setting source output levels 2 6 Remote programming 2 8 Math 2 9 Front panel operatio...

Page 7: ...4 2 Cabling requirements 4 3 Wiring procedure 4 4 Zippertubing shield 4 8 Guarding 4 9 Switching module installation 4 10 Module slot considerations 4 10 Power supply restrictions with the 7753 module...

Page 8: ...Test procedure 5 31 6 Model 2790 DMM Ohms Functions Introduction 6 2 Low ohms measurements 6 2 Fuse resistance considerations 6 2 High ohms measurements 6 3 4 wire ohms 6 3 Offset compensated ohms 6...

Page 9: ...1 Simplified schematic of Keithley 7702 switching module 3 4 Figure 3 2 2 and thermistor TEMP connections 3 5 Figure 3 3 4 and RTD TEMP connections 3 6 Figure 3 4 Current connections DCI and ACI 3 6 F...

Page 10: ...tage inflator 5 19 Figure 5 10 Test circuits contact check dual stage inflator 5 19 Figure 5 11 V source readback circuit 5 22 Figure 5 12 Test circuit HIPOT 5 25 Figure 5 13 I source readback circuit...

Page 11: ...Table 3 2 Commands to control 7702 module channels 3 11 5 Inflator Testing Table 5 1 Test procedure shunt bar 5 13 Table 5 2 Test procedure bridgewire 5 15 Table 5 3 Test procedure contact checks for...

Page 12: ...l 2790 and defines explains technical terms associated with airbag inflators Model 2790 configurations Explains the various mainframe module combina tions available from Keithley Test system Shows a t...

Page 13: ...7753 modules have a built in program mable voltage source 50 to 500V and an I V converter to measure the insulation resistance of an inflator Current through the insulator is applied to the I V con v...

Page 14: ...current method typically 10 to 50mA HIPOT test Measure the insulation resistance 100M between the bridgewire and the inflator housing using an applied voltage typically 500V HIPOT Used in this manual...

Page 15: ...e module system allows parallel soak and test of each half 2790 HL configuration one 7751 and one 7752 module This test system includes a 7751 module and a 7752 module The high voltage module 7751 can...

Page 16: ...ng modules Modules for testing inflators include the Models 7751 7752 and 7753 A Model 7702 module can also be used with the Model 2790 NOTE Only one Model 7753 module can be installed in a Model 2790...

Page 17: ...after all other inflator tests are completed As a final test it verifies that it is safe to install the inflator in a vehicle A shunt bar shorting clip is used to short the bridgewire s to prevent acc...

Page 18: ...ss to detect the presence of oxide build up and more accurately measure the resistance of the shunt bar 1 Test the shunt bar using dry circuit ohms channel 24 closed and a test current of 1mA A resist...

Page 19: ...the bridgewire The voltage across the bridgewire is then measured by the DMM of the Model 2790 Figure 1 3 Bridgewire testing With the low ohms math function selected the RBRID reading can be read dir...

Page 20: ...initiators and the housing must be verified As shown in Figure 1 4 this is performed by applying a voltage typically 500V between the bridgewire and the housing The resultant test circuit current is...

Page 21: ...ade to the air bag inflator housing If good contact is not established the measured high resistance will not represent the isolation resistance Contact is checked by per forming continuity checks thro...

Page 22: ...en using the V source and I V amplifier of the 7751 7753 module Opening and closing channels Explains how to open and close channels for the 7751 7752 and 7753 modules Viewing closed channels Explains...

Page 23: ...e S Mainframe slot number 1 or 2 CH Switching module channel number of source 2 digits Examples 101 Slot 1 Channel 1 101 114 118 Slot 1 Channels 1 14 and 18 Card configuration CAUTION External energy...

Page 24: ...ce Sense Ch 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...

Page 25: ...inflator The V source is designated as channel 28 Closing channel 22 selects the V source Closing channel 21 connects the V source Closing channel 23 connects the I V amplifier WARNING Do not connect...

Page 26: ...k switch does not affect the output of J107 Voltage can still be present at those terminals even if the interlock is disabled See General purpose terminal blocks J105 J107 and J108 for additional deta...

Page 27: ...del 2790 system is not an intrinsically safe device it is the responsibility of the user to ensure that external protection be pro vided either by an inherently safe electrical barrier and or a safety...

Page 28: ...levels SHIFT CARD CONFIG SLOT1 77xx I C27 01 00 mA V C28 050 0 V I C27 01 00 mA 7751 7752 7753 V C28 050 0 V 7751 7753 Press Press Select Select module 77xx 7751 7752 7753 Set I source output Set V s...

Page 29: ...ude for V source and I source Commands Description Default SOURce VOLTage LEVel IMMediate AMPLitude NRf clist Set V source output 50 to 500 V clist 128 Slot 1 228 Slot 2 50V AMPLitude clist Query V so...

Page 30: ...52 or 7753 1 ISOUR is the m factor for the calculation mX b VMEAS is the voltage measured by the DMM of the Model 2790 It is the X variable for the calculation mX b When the SxIohms calculation is sel...

Page 31: ...output voltage of the V I amplifier measured by the DMM of the Model 2790 It is the X variable for the calculation m X b When the SxVohms calculation is selected the Model 2790 measures voltage X and...

Page 32: ...actually measuring DCV Therefore if you send SENS1 FUNC to query the selected function it will return VOLT DC Source tracking The Model 2790 provides source tracking to ensure that the most recently...

Page 33: ...lected math format CALCulate 1 STATe b Enable or disable math calculation CALCulate 1 STATe Query state of selected math calculation CALCulate 1 DATA LATest Return last result of calculation CALCulate...

Page 34: ...odule the slot number must be included with the switching module channel number The channel assignment is formatted as follows SCH where S is the slot number 1 or 2 CH is the channel number Examples 1...

Page 35: ...OPEN clist Open channels specified in list Unlisted channels not affected ROUTe OPEN ALL Open all channels ROUTe MULTiple CLOSe Returns a clist of all closed channels ROUTe MULTiple CLOSe STATe clist...

Page 36: ...identify the end of the channel string Use the ENTER key to pause and resume scrolling Press EXIT to return to the normal display state NOTE For remote programming closed channels can be identified us...

Page 37: ...edence Overflowed readings stored in the buffer do not provide interlock status You cannot tell if the overflow readings are true overflows or the result of open interlock see Remote programming error...

Page 38: ...annel 20 remains closed as long as interlock remains open see Interlock in Section 5 for details Opening channel 22 closes channel 20 for approximately 5msec to discharge the capacitors Opening channe...

Page 39: ...e activated manually at any time by closing channel 20 of the 7751 7753 module Typically manual discharge is used when a discharge time 5msec is desired Figure 2 6 Cable discharge circuit 100k CSO 1nF...

Page 40: ...connection information and channel descriptions as needed Table 2 4 Connection log Model 7751 7752 7753 Bank Channel Color Description CH1 HI Source Sense Bank 1 CH2 LO Source Sense CH3 A1 B1 CH4 HI...

Page 41: ...l and taking a reading you can 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 279...

Page 42: ...URce LEVel n NRf clist Assign source values to the channels in clist that will be output when memory pattern n is executed Source channels only 127 128 227 or 228 ROUTe MEMory DELay n NRf Assign a var...

Page 43: ...ent function for memory pattern location 1 SENS FUNC RES M1 Once various attributes are assigned to memory pattern locations those functions will be executed when those memory pattern locations are re...

Page 44: ...rn log Table 2 6 provides a log for you to record the stored parameters for each memory location Table 2 6 Memory pattern log Memory location Source level s Delay Channels Functions M1 M2 M3 M4 M5 M6...

Page 45: ...Model 2790 SourceMeter Switch System User s Manual M25 M26 M27 M28 M29 M30 M31 M32 M33 M34 M35 M36 M37 M38 M39 M40 Table 2 6 cont Memory pattern log Memory location Source level s Delay Channels Funct...

Page 46: ...n this application Card configuration Provides the simplified schematic of the Keithley 7702 switching module Summarizes key aspects of the module Typical connections Shows typical module connections...

Page 47: ...ecautions In a system to test inflators a 7702 module may be used with the 7751 7752 or 7753 module In a mixed module configuration like this the following safety precautions must be understood and ta...

Page 48: ...s channels 21 through 40 Each channel of the 40 channel multiplexer card is wired with separate inputs for HI LO providing fully iso lated inputs The Model 7702 also provides two channels of current i...

Page 49: ...HI LO 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 Note Channels 43 45 in this sche...

Page 50: ...owing types of measurements 2 and thermistor temperature connections see Figure 3 2 4 and RTD temperature connections see Figure 3 3 Current connections DCI or ACI see Figure 3 4 Voltage connections D...

Page 51: ...g the 7702 module to make ohms measurements see Section 6 Model 2790 DMM Ohms Functions Figure 3 4 Current connections DCI and ACI Channel 1 HI LO Channel 20 HI LO Channels 2 19 Channel 21 HI LO Chann...

Page 52: ...Voltage connections DCV or ACV Connection log Make a copy of Table 3 1 and affix it to the cover of the Model 7702 Use this to record connection information and channel descriptions as needed Channel...

Page 53: ...H H CH1 L L CH22 H H CH2 L L CH23 H H CH3 L L CH24 H H CH4 L L CH25 H H CH5 L L CH26 H H CH6 L L CH27 H H CH7 L L CH28 H H CH8 L L CH29 H H CH9 L L CH30 H H CH10 L L CH31 H H CH11 L L CH32 H H CH12 L...

Page 54: ...ct the input to the DMM of Model 2790 Example With the 2 function selected closing channel 1 also closes channel 45 When an input channel is closed for a 4 wire function or operation the two back plan...

Page 55: ...ed input channel With the last 7702 input channel closed displayed pressing the key opens the closed input channel CLOSE key As shown in Figure 3 7 the SINGLE option of the CLOSE key can be used to cl...

Page 56: ...able 3 2 Examples ROUT OPEN ALL Open all channels ROUT CLOS 101 Close 7702 channel 1 in slot 1 ROUT CLOS Return closed channel Table 3 2 Commands to control 7702 module channels Commands Description R...

Page 57: ...Figure 3 9 the closed channels will scroll across the display The four dots identify the end of the channel string Use the ENTER key to pause and resume scrolling Press EXIT to return to the normal d...

Page 58: ...output of the DUT To prevent overloading of the V source each DUT is powered and measured separately Figure 3 10 shows the test circuit for this application The 7751 V source is connected to the Sense...

Page 59: ...ultiplexer Ch 1 DUT 1 43 Keithley 7702 Module Model 2790 DMM Ch 2 DUT 2 Ch 20 DUT 20 Ch 21 Ch 22 Ch 40 Keithley 7751 7753 Module Vsrc HI Vsrc LO All 7751 7753 channels open J107 Closed channel Open ch...

Page 60: ...Connections and wiring Provides the details needed to make connections to the screw terminals of the 7751 7752 7753 and 7702 modules Switching module installation Explains how to install a 7751 7752 7...

Page 61: ...hat may exceed the maximum specifications of the module Specifications for the switching modules are pro vided in Appendix A Do not apply 42V between any terminal HI or LO and chassis ground Do not ap...

Page 62: ...al movement like a device handler Recommended cable wire Beldon 8899 cable wire which is stranded 18AWG in size with a thick rubber insulation rated for 5000V working voltage It is very flexible and m...

Page 63: ...ING All wiring and supplementary insulation must be rated for the maxi mum voltage in the system For example if 500V is being used in the test system the module wiring for both slots must be rated for...

Page 64: ...LO LO BANK 1 BANK 2 BANK 4 BANK 3 I V B1 B2 B4 B3 HI HI LO LO INT INT J105 GUARD SOURCE SENSE HI HI LO LO J101 Input channels 1 3 SRC HI SRC LO SEN HI SEN LO A1 BANK 1 B1 Ch 2 Ch 1 Ch 3 J102 Input ch...

Page 65: ...4 H L CH5 H L CH6 H L CH7 H L CH8 H L CH9 H L CH10 H L CH11 H L CH12 H L CH13 H L CH14 H L CH15 H L CH16 H L CH17 H L CH18 H L CH19 H L CH20 H L H L CH21 H L CH22 H L CH23 H L CH24 H L CH26 H L CH28 H...

Page 66: ...ementary Insulation GUARD SOURCE SENSE SRC HI LO SRC LO SEN HI SEN LO A BANK 2 B HI HI LO LO B Ground Wire Zippertubing Shield HI SRC HI SRC LO SRC LO SRC HI SEN HI SEN LO SEN LO SEN A A LO I V GUARD...

Page 67: ...uce measurement noise caused by EMI from nearby machinery A recommended shield is shown in Figure 4 5 It is a Zippertubing ZTZ SH3 series shield As shown the foil side wraps around the cable wires The...

Page 68: ...in cable bundle whose shield is connected to safety earth ground The guard shield should be insulated with an outer jacket A second Zippertubing shield can be used as the guard shield WARNING The guar...

Page 69: ...ty or pop ulated with a 7702 module If this condition is violated a Model 7753 plus any other 775x module the Model 2790 will lock up with the message 1 7753 ONLY displayed and all annunciators will t...

Page 70: ...measure the resistance of a shunt bar Bridgewire tests Provides the test circuit and procedure to measure bridgewire resistance of an inflator Insulation resistance HIPOT tests 7751 7753 only Provides...

Page 71: ...slot 1 of the mainframe NOTE Only one Model 7753 can be installed in a Model 2790 and it should be installed in slot 1 A 7753 module can be used in slot 2 but measurement accuracy might be adversely a...

Page 72: ...Model 7753 can be installed in a Model 2790 and it should be installed in slot 1 A 7753 module can be used in slot 2 but measurement accuracy might be adversely affected because cards are always calib...

Page 73: ...cessed by pressing and releasing SHIFT and then pressing RS 232 Once in the menu use the following key press sequence to select and configure the RS 232 Select RS 232 ON select BAUD rate select FLOW c...

Page 74: ...7753 module as shown in Figure 5 2 through Figure 5 5 Single stage inflator test connections Figure 5 2 Use this connection scheme if using a Keithley 7752 module It can also be used for the 7751 or 7...

Page 75: ...Bar and HIPOT Testing Built in shunt Available for use during HIPOT testing SRC HI SEN HI SRC LO SEN LO Ch 8 Bank 3 J103 A1 B1 Some wires are shown in bold to make it easier to follow the signal paths...

Page 76: ...tion scheme if using a Keithley 7751 or 7753 mod ule It includes the connections for the HIPOT test Figure 5 4 Test connections shunt bar and bridgewire bar testing dual stage inflator SRC HI SEN HI S...

Page 77: ...7753 Shunt Bars B Bridgewire Testing A Shunt Bar and HIPOT Testing A B Built in shunt Available for use during HIPOT testing Some wires are shown in bold to make it easier to follow the signal paths...

Page 78: ...the rest of the switch matrix With interlock disabled you will not be able to close switches that connect the selected source to the DUT and DMM The typical test station has a built in interlock switc...

Page 79: ...en With the INPUTS switch in the REAR position in readings will overflow OFLO when the interlock is open The IL1 or IL2 message will also be displayed to identify which slot is in violation With both...

Page 80: ...e testing process for an inflator The typical test station uses a spring loaded mechanism that automati cally installs or removes the shunt bar Test circuit The circuit for the shunt bar test is shown...

Page 81: ...surement cannot exceed 1mA due to the dry circuit hardware limit See Table 5 2 for an example of a test sequence for dual inflator I source readback The 7751 7752 and 7753 modules have source readback...

Page 82: ...Resetting the 2790 opens all channels selects the DCV function auto range and selects the I source of the 7751 7752 7753 mod ule For remote programming RST places the 2790 in the one shot trigger mod...

Page 83: ...st circuit bridgewire tests 2790 DMM v Input HI Input LO 17 18 18 21 21 1 or 4 2 or 5 Bridgewire Under Test 1 Closed channel switch Test assumptions To test bridgewire connected to Bank 1 close input...

Page 84: ...hms calculation CALC1 FORM S1I CALC1 STAT ON Press SHIFT press MATH select S1IOHMS 4 Close channels to test bridgewire ROUT MULT CLOS 101 102 117 118 121 Press CLOSE select MULTI select 101 select 102...

Page 85: ...7753 module the V source output setting will be displayed after setting the I source output 3 This step selects the low resistance calculation R VMEAS ISOUR Selecting S1IOHMS sets DMM to DCV 1V range...

Page 86: ...t circuit is properly connected to the inflator housing and the bridgewire V source readback This test uses the voltmeter of the Model 2790 to measure the actual output of the V source This test shoul...

Page 87: ...in Figure 5 9 there are three contact connection points for the V source test circuit Contact checks are performed as follows Bank 1 HI contact Close channels 1 14 and 18 to check the connection at th...

Page 88: ...pole switch Therefore when a channel is closed two switches close see schematic in Figure 2 1 Keithley 7751 7753 Internal 0 062A fuses not shown see Section 6 1 Dual Stage Inflator 2790 DMM Lo Lo 2 27...

Page 89: ...select 108 select 115 select 118 press EXIT 8 Verify channels that are closed optional ROUT MULT CLOS Press SHIFT press CARD select VIEW select SLOT1 7751 7752 or 7753 Press EXIT when finished 9 Perf...

Page 90: ...ess SHIFT press CARD select VIEW select SLOT1 7751 7752 or 7753 Press EXIT when finished 13 Perform measurement READ Take reading from display Reading should be 2 or less 14 Open all channels ROUT OPE...

Page 91: ...range to measure the maximum output of the 7751 7753 500V Figure 5 11 V source readback circuit 2790 DMM Input Hi VSOURCE 22 v Input Lo 18 18 Closed channel switch 13 13 21 23 Selects V source I V Amp...

Page 92: ...nnection figures to reduce the possibility of measurement errors caused by leakage resistance Table 5 5 Test procedure V source readback Test Step Command Sequence Front Panel Operation 1 Reset 2790 a...

Page 93: ...POT test is shown in Figure 5 12 Internal shunts The HIPOT test is usually performed with the shunt bar installed This shorts the bridgewire to prevent accidental ignition of the inflator However if t...

Page 94: ...lator connected to Banks 1 and 2 close channels 3 4 and 6 Closing channels 3 and 6 connects internal built in shunts across the two bridgewires 2790 DMM v Input HI Input LO 21 Bridgewire Inflator Hous...

Page 95: ...delay to allow source to settle Press SHIFT press CARD select CONFIG select SLOT1 7751 or 7753 display V C28 set to 500 0 V 3 Select and enable the high ohms calculation CALC1 FORM S1V CALC1 STAT ON P...

Page 96: ...e I source setting 3 This step selects the high resistance calculation R VSOUR IMEAS Selecting S1VOHMS sets the DMM to DCV 10V range 4 This step closes the channels to make the test connections for th...

Page 97: ...the current for the bridgewire test while Figure 5 13B shows how to measure the current for the shunt bar test In both circuits the Model 2790 DMM measures the voltage across the 1 resistor VMEAS Read...

Page 98: ...readback bridgewire B Test circuit for current source readback shunt bar Test assumption Shunt bar connected to Bank 1 18 18 ISOURCE Ch 22 open I source selected 2790 DMM v Input HI Input LO 25 25 IR...

Page 99: ...1 HI contact Close channels 1 14 and 18 to check the connection at the HI terminal of bridgewire A Bank 2 housing contact Close channels 8 15 and 18 to check the connection at the housing of the infl...

Page 100: ...ttern loca tion recall shown in Table 5 8 memory locations are first set up and each location is recalled in succession Table 5 7 Command sequence for memory patterns test example using scanning Comma...

Page 101: ...for three memory locations TRIG SOUR IMM Immediate trigger source TRIG COUN 1 Trigger count 1 SAMP COUN 3 Sample count 3 TRAC CLE Clear buffer TRAC POIN 3 Store three readings in buffer TRAC FEED CON...

Page 102: ...ls 4 14 and 18 for memory location 2 ROUT MEM DEL 2 0 Set delay to 0 ROUT MEM READ STAT 2 ON Enable reading SENS FUNC RES M2 Select 2 wire ohms SENS RES RANG 100 M2 Select 100 range SENS RES NPLC 1 M2...

Page 103: ...5 34 Model 2790 SourceMeter Switch System User s Manual...

Page 104: ...hms technique to measure low resistance Offset compensated ohms Explains the offset compensated ohms feature which is used to cancel the adverse effects of offset voltages present in the test circuit...

Page 105: ...cannot exceed 62mA Fuses F1 and F2 are in series with the backplane connection to the meter INPUT HI For DMM resistance measurements these fuses are in series with the mainframe current source similar...

Page 106: ...resistance when measuring a low ohms DUT Figure 6 1 shows how 2 wire ohms can be adversely affected when measuring a low ohms DUT If the test lead resistance RLEAD is relatively large in comparison t...

Page 107: ...e DMM of the Model 2790 negligible current will flow through the sense leads Since the voltage across the sense leads will be negligible the voltage measured by the DMM VMEAS is essentially the same a...

Page 108: ...e 4 wire resistance function 4W annunciator on 2 Use the RANGE up and down keys to select the 100 1k or 10k range 3 Press and release SHIFT and then OCOMP to enable offset compensated ohms OCOMP annun...

Page 109: ...hannels are provided in Section 7 of the Model 2790 Reference Manual Figure 6 3 shows the simplified test circuit for using the 4 function of the Model 2790 with the 7702 module to measure low ohm DUT...

Page 110: ...The DUT is connected to channel 1 of the 7702 When channel 1 is closed using system channel operation the DUT connects to the DMM of the Model 2790 Figure 6 4 Using Model 2790 2 wire ohms with 7702 m...

Page 111: ...the 7751 7752 7753 module to measure the resistance of a DUT The DUT is con nected to channels 10 and 11 Bank 4 of the 7751 7752 7753 To connect the DUT to the DMM of the Model 2790 channels 10 11 13...

Page 112: ...the Model 2790 to measure a resistance through one of the 775X modules there will be an offset in the measured value due the signal path resistance of the 775X module see Fuse resistance consid eratio...

Page 113: ...6 10 Model 2790 SourceMeter Switch System User s Manual...

Page 114: ...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 115: ...uit Accuracy 0 5 0 13V 2yr Specification Settling Time Rise Time 50V to 500V step 0 1 of final value 250 ms max Fall Time 500V to 50V step 0 1 of final value 1000 ms max Temperature Coefficient 0 18 C...

Page 116: ...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 Source Enable Isr...

Page 117: ...0 00000 mA 10 nA 0 2 V 60 30 300 80 500 80 50 5 C 100 0000 mA 100 nA 0 05 V 100 300 300 800 500 800 50 50 C 1 000000 A 1 0 A 0 3 V9 200 30 500 80 800 80 50 5 C 3 000000 A 10 A 1 0 V9 1000 15 1200 40 1...

Page 118: ...V 2ppm 100 30ppm 1M 2ppm 10mA and 1A 10ppm 100mA 40ppm 3 2 measured with 10M input resistance DMM 10G DMM on 10M and 100M ranges 4 Relative to calibration accuracy 5 For signal levels 500V add 0 02ppm...

Page 119: ...80 ppm 33 3 ppm FAST 10ms gate Additional Uncertainty of reading Low Frequency Uncertainty MED FAST 20Hz 30Hz 0 3 30Hz 50Hz 0 50Hz 100Hz 0 1 0 100Hz 200Hz 0 0 18 200Hz 300Hz 0 0 10 300Hz 0 0 CREST FAC...

Page 120: ...ST NPLC 0 01 Auto Zero off Auto Range off and Display off Sample count 1024 Includes measurement and binary data transfer out GPIB GENERAL SPECIFICATIONS POWER SUPPLY 100V 120V 220V 240V LINE FREQUENC...

Page 121: ...t 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 1mA...

Page 122: ...00183 C Ohms offset 0 001 30 C 0 033m C Ohms temperature coefficient 30mA 0 00183 0 033m C 7751 7753 V source High ohms specifications using the V source of the 7751 7753 are provided for the 500V an...

Page 123: ...00 C For measurements 10M to 100M Ohms accuracy of reading 1 1 60 VSOURCE Ohms offset 20k where VSOURCE is the voltage output setting in volts Example Determine ohms accuracy for a V source setting of...

Page 124: ...le Determine ohms accuracy for a V source setting of 100V of reading 2 510 100 2 5 1 7 1 Ohms accuracy 100V 7 1 20k Ohms temperature coefficient TC of reading 0 02 51 VSOURCE C TC ohms offset 200 C wh...

Page 125: ...A 12 Specifications Model 2790 SourceMeter Switch System User s Manual...

Page 126: ...s 1 10 D discharge circuit 2 17 dual inflator 1 4 E Errors 241 870 2 12 F Front Panel 3 10 Open interlock errors 5 10 operation 2 11 message 2 16 opening and closing channels 2 13 view closed channels...

Page 127: ...annels Control commands 2 8 2 12 2 14 3 11 6 5 operation 2 13 O ohms math function 2 11 OPEN key 3 10 3 11 Opening and closing channels Model 7702 3 9 Model 7751 7752 2 13 operation multiple channel 2...

Page 128: ...HIPOT and bridgewire 5 6 Test System 1 5 Overview 1 1 testing two inflators 1 4 Typical connections Model 7702 3 5 typical test system 1 5 V Viewing closed channels Model 7702 3 12 Model 7751 7752 2 1...

Page 129: ......

Page 130: ...www keithley com cn Japan Tokyo 81 3 5733 7555 Fax 81 3 5733 7556 www keithley jp Finland Helsinki 09 5306 6560 Fax 09 5306 6565 www keithley com Korea Seoul 82 2 574 7778 Fax 82 2 574 7838 www keithl...

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