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Keithley 2700, Service Manual

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Keithley 2700 Service Manual Download Page 97

Troubleshooting

4-17

Figure 4-3

 provides a block diagram of the analog circuitry. 

Table 4-17

 shows where the var-

ious switching devices are located in the block diagram.

Table 4-15

Ω

2 signal multiplexing and gain

Range

Signal
(U163)

U129
pin 1

U129
pin 8

U129
pin 9

Gain
(U166)

100

Ω

1k

Ω

10k

Ω

100k

Ω

1M

Ω

10M

Ω

100M

Ω

S4
S4
S4
S4
S4
S4
S4

OFF
OFF
OFF
OFF
ON
ON
ON

OFF
ON
ON
ON
OFF
OFF
OFF

ON
OFF
OFF
OFF
OFF
OFF
OFF

×

100

×

10

×

10

×

10

×

1

×

1

×

1

Table 4-16

Ω

4 signal multiplexing and gain

Range

Signal
(U163)

U129
pin 1

U129
pin 8

U129
pin 9

Gain
(U166)

100

Ω

1k

Ω

10k

Ω

100k

Ω

1M

Ω

10M

Ω

100M

Ω

S4 then S7
S4 then S7
S4 then S7
S4 then S7
S4 then S7
S4 then S7
S4 then S7

OFF
OFF
OFF
OFF
ON
ON
ON

OFF
ON
ON
ON
OFF
OFF
OFF

ON
OFF
OFF
OFF
OFF
OFF
OFF

×

100

×

10

×

10

×

10

×

1

×

1

×

1

Table 4-17

Switching device locations

Switching devices

Analog circuit section (see 

Figure 4-3

)

Q101, Q102
Q114, Q136, Q109
K101, Q113, Q105, Q104, Q108
Q121
K102, U103, U105, U111
U133, Q120, Q123, Q124, Q125, Q126
K103
U129, U163

SSP (Solid State Protection)
DCV Divider
DCV and Ohms Switching
Sense LO
AC switching and Gain
Ohms I-Source
Current Shunts
A/D Mux and Gain

Summary of Contents for 2700

Page 1: ...Contains Servicing Information Model 2700 Multimeter DataAcquisition System Service Manual...

Page 2: ...Y OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN...

Page 3: ...Model 2700 Multimeter Data Aquisition System Service Manual 1999 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Second Printing February 2000 Document Number 2700 902 01 Rev B...

Page 4: ...to the manual Addenda are numbered sequentially When a new Revision is created allAddenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each...

Page 5: ...Standards Institute ANSI states that a shock haz ard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to expect that hazardous voltage is prese...

Page 6: ...g in a manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading in a ma...

Page 7: ...verification test procedures 1 6 Verification test summary 1 6 Test considerations 1 7 Model 2700 verification 1 8 Verifying DC voltage 1 8 Verifying AC voltage 1 9 Verifying DC current 1 11 Verifyin...

Page 8: ...2 18 Extender board preparation 2 19 Unlocking manufacturing calibration 2 19 Measuring function generator signal amplitude 2 19 Front panel manufacturing calibration 2 20 Remote manufacturing calibra...

Page 9: ...hing states 4 13 No comm link error 4 18 5 Disassembly Introduction 5 2 Handling and cleaning 5 2 Handling PC boards 5 2 Solder repairs 5 2 Static sensitive devices 5 3 Assembly drawings 5 3 Disassemb...

Page 10: ...ltage and AC current A 14 Temperature A 14 Optimizing measurement speed A 15 DC voltage DC current and resistance A 15 AC voltage and AC current A 15 Temperature A 15 B Calibration Reference Introduct...

Page 11: ...rting B 21 Error summary B 21 Error queue B 23 Status byte EAV Error Available bit B 23 Generating an SRQ on error B 23 Detecting calibration step completion B 23 Using the OPC query B 23 Using the OP...

Page 12: ...for Model 7700 AC current verification 1 24 Figure 1 12 Connections for Model 7700 resistance verification 100 to 10M ranges 1 25 Figure 1 13 Connections for Model 7700 resistance verification 100M r...

Page 13: ...hooting Figure 4 1 Power supply block diagram 4 4 Figure 4 2 Digital circuitry block diagram 4 6 Figure 4 3 Analog circuitry block diagram 4 9 C Calibration Program Figure C 1 Model 2700 calibration p...

Page 14: ...imits 1 28 Table 1 15 Plug in module four wire RTD temperature verification reading limits 1 29 2 Calibration Table 2 1 Recommended equipment for comprehensive calibration 2 5 Table 2 2 Comprehensive...

Page 15: ...16 4 signal multiplexing and gain 4 17 Table 4 17 Switching device locations 4 17 5 Disassembly Table 5 1 Input terminal wire colors 5 7 Table 5 2 Power module wire colors 5 7 6 Replaceable Parts Tab...

Page 16: ......

Page 17: ...1 PerformanceVeri cation...

Page 18: ...l under warranty and its performance is outside specified lim its contact your Keithley representative or the factory to determine the correct course of action If the unit is not under warranty and it...

Page 19: ...to warm up for at least two hours before conducting the verification procedures If the instrument has been subjected to temperature extremes those outside the ranges stated above allow additional tim...

Page 20: ...0ppm 100mA 70ppm 1A 110ppm 2 2A 94ppm 1A 690ppm 2 2A 682ppm 100 17ppm 1k 12ppm 10k 11ppm 100k 13ppm 1M 18ppm 10M 37ppm 100M 120ppm Fluke 5725A Amplifier AC Voltage 50kHz 700V 375ppm DC Current 3A 500p...

Page 21: ...10 00035V Calculating resistance reading limits Resistance reading limits must be recalculated based on the actual calibration resistance val ues supplied by the equipment manufacturer Calculations ar...

Page 22: ...2700 accuracy through the front panel terminals Model 7700 verification Use this procedure to test accuracy through any of the available plug in modules with the same functions as the Model 7700 20 C...

Page 23: ...precautions when performing these tests Some of the procedures in this section may expose you to dangerous voltages Use standard safety precautions when such dangerous volt ages are encountered to av...

Page 24: ...effects Connect the shield to the calibra tor s output LO terminal Figure 1 1 Connections for Model 2700 DC volts verification 2 Select the DC volts function by pressing the DCV key and set the Model...

Page 25: ...tions for Model 2700 AC volts verification Table 1 2 DCV reading limits Range Applied DC voltage Reading limits 1 year 18 to 28 C 100mV 1V 10V 100V 1000V 100 0000mV 1 000000V 10 00000V 100 0000V 1000...

Page 26: ...3 ACV reading limits ACV range Applied AC voltage 1kHz reading limits 1 year 18 C to 28 C 50kHz reading limits 1 year 18 C to 28 C 100mV 1V 10V 100V 750V 100 0000mV 1 000000V 10 00000V 100 0000V 700...

Page 27: ...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 89960 to 20 01040mA 99 9100 to 100 0900mA 0 999160 to 1 000840...

Page 28: ...ed in Table 1 5 and verify that the readings are within stated limits Table 1 5 ACI limits ACV range Applied AC voltage Reading limits 1kHz 1 year 18 C to 28 C 1A 3A 1 000000A 3 00000A 0 99860 to 1 00...

Page 29: ...e resistance function by pressing the 4 key then choose the SLOW integration rate with the RATE key 4 Set the Model 2700 for the 100 range and make sure the FILTER is on Enable OCOMP offset compensate...

Page 30: ...10 00410M 99 7970 to 100 2030M __________ to __________ __________ to __________ k __________ to __________ k __________ to __________ k __________ to __________ M __________ to __________ M _________...

Page 31: ...TS switch is in the FRONT position 2 Configure the Model 2700 for C units type J temperature sensor and 0 C simulated reference junction as follows a Press SHIFT then SENSOR and note the unit displays...

Page 32: ...emperature units UNITS C b Press ENTER and note the unit displays the sensor type SENS TCOUPLE c Using the cursor and range keys set the display as follows SENS 4W RTD d Press ENTER and note the unit...

Page 33: ...1 7 Connections for Model 2700 frequency verification Table 1 8 Four wire RTD temperature verification reading limits Applied resistance Reading limits 1 year 18 C to 28 C 22 80 100 00 313 59 190 06...

Page 34: ...o not exceed 300V DC between plug in module INPUT H and L termi nals or between any adjacent channels Follow these steps to verify DC voltage accuracy 1 Connect the Model 7700 CH1 H and L INPUT termin...

Page 35: ...g to settle 5 Enable the Model 2700 REL mode Leave REL enabled for the remainder of the DC volts verification tests 6 Source positive and negative and full scale voltages for each of the ranges listed...

Page 36: ...tru ment damage may occur Follow these steps to verify AC voltage accuracy 1 Connect the Model 7700 CH1 H and L INPUT terminals to theAC voltage calibrator as shown in Figure 1 9 Figure 1 9 Connection...

Page 37: ...rized in Table 1 10 and make sure that the respective Model 2700 readings fall within stated limits 6 Press the OPEN key to open Channel 1 Table 1 10 Plug in module ACV reading limits ACV range Applie...

Page 38: ...he Model 7700 CH21 H and L terminals to the calibrator as shown in Figure 1 10 Figure 1 10 Connections for Model 7700 DC current verification H L H L AMPS H L H L H L H L H L H L LO CH21 CH22 CH11 CH1...

Page 39: ...ve and negative full scale currents for each of the ranges listed in Table 1 11 and verify that the readings for each range are within stated limits 6 Press the OPEN key to open Channel 21 Table 1 11...

Page 40: ...ion by pressing the ACI key 4 Set the Model 2700 for the 1A range Close Channel 21 by pressing the CLOSE key and keying in 121 5 Source 1A and 3A 1kHz full scale AC currents as summarized in Table 1 1...

Page 41: ...arm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Set the calibrator for 4 wire resistance with external sense on 4 Select the Model 2700 4 wir...

Page 42: ...e and verify that the reading is within calcu lated limits for the 100M range 12 Press the OPEN key to open Channel 1 Figure 1 13 Connections for Model 7700 resistance verification 100M range H L H L...

Page 43: ...e Model 2700 for C units type K temperature sensor and internal refer ence junction as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C If necessary use the c...

Page 44: ...0 C 1 0 to 1 0 C 749 0 to 751 0 C 191 0 to 189 0 C 1 0 to 1 0 C 1349 0 to 1351 0 C Voltages shown are based on ITS 90 standard H L H L AMPS H L H L H L H L H L H L LO CH21 CH22 CH11 CH12 CH13 CH14 CH...

Page 45: ...00385 as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C b Press ENTER and note the unit displays the sensor type SENS TCOUPLE c Using the cursor and range k...

Page 46: ...verification Verifying ratio and average Follow the procedure below to verify ratio and average CAUTION Exceeding 300V between plug in module INPUT or SENSE H and L ter minals may cause instrument dam...

Page 47: ...N to open Channel 1 Figure 1 16 Connections for Model 7700 ratio and average verification H L H L AMPS H L H L H L H L H L H L LO CH21 CH22 CH11 CH12 CH13 CH14 CH15 CH16 H L H L H L H L CH17 CH18 CH19...

Page 48: ...1 32 Performance Verification...

Page 49: ...2 Calibration...

Page 50: ...DC only andAC only calibration may be performed individually if desired Environmental conditions Conduct the calibration procedures in a location that has An ambient temperature of 18 to 28 C 65 to 8...

Page 51: ...res 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 by electric shock For the...

Page 52: ...002700 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 code by pressing ENT...

Page 53: ...comprehensive DC only and AC only calibration procedures You can use alternate equipment such as a DC transfer stan dard and characterized resistors as long that equipment has specifications at least...

Page 54: ...calibration Resistance calibration DC current calibration AC voltage calibration AC current calibration Setting calibration dates Preparing the Model 2700 for calibration 1 Turn on the Model 2700 and...

Page 55: ...away from low thermal connections to avoid thermal drift which could affect calibration accuracy Table 2 2 Comprehensive calibration procedures Procedure Menu choice Procedures Full calibration DCV D...

Page 56: ...ted and discon nected 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 external sense on and of...

Page 57: ...rnal sense NOTE Use external sense 4 wire when calibrating all resistance ranges Be sure that the calibrator external sense mode is turned on 2 Perform the calibration steps summarized in Table 2 4 Fo...

Page 58: ...e performing DC only calibration proceed to Setting calibration dates and saving calibration Table 2 5 DC current calibration summary Calibration step Calibrator current Allowable range 10mA 100mA 1A...

Page 59: ...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 1 000000V 1kHz 1 000000V 50kHz 1...

Page 60: ...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 ENTER 2 The unit will...

Page 61: ...Locking out calibration NOTE As with front panel calibration you can choose to perform comprehensive DC only or AC only calibration Be sure to include a space character between each command and param...

Page 62: ...w thermal short and then send this command CAL PROT DC STEP2 NOTE Be sure to minimize movement near front Input terminals Excessive movements can cause capacitive coupling errors which could affect ca...

Page 63: ...2 9 For each step Set the calibrator to the indicated resistance and make sure the unit is in operate Use the recommended resistance or the closest available value Send the indicated programming comma...

Page 64: ...ion proceed to Programming calibration dates AC voltage calibration Follow these steps for AC voltage calibration 1 Connect the calibrator to the Model 2700 INPUT HI and LO terminals as shown in Figur...

Page 65: ...15 1999 and 12 15 2000 respectively CAL PROT DATE 1999 12 15 CAL PROT NDUE 2000 12 15 Table 2 11 AC voltage calibration programming steps Calibration step Calibrator voltage frequency Calibration com...

Page 66: ...the unit requires these calibra tion procedures NOTE If the unit has been repaired the entire comprehensive calibration procedure should also be performed in addition to the manufacturing calibration...

Page 67: ...uring calibration To unlock manufacturing calibration press and hold in the OPEN key while turning on the power Measuring function generator signal amplitude The 3Hz function generator signal amplitud...

Page 68: ...calibration 8 After the last AC current calibration step the instrument will prompt you to enter 3Hz at 1V RMS and 1kHz with the following prompts Low frequency cal Set the function generator to outpu...

Page 69: ...orm the entire remote comprehensive calibration procedure discussed earlier in this section See Comprehensive calibration earlier in this section 7 Connect the function generator to the Model 2700 INP...

Page 70: ...een removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure as quickly as possi ble to mini...

Page 71: ...e Model 7700 7797 combination in Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium 3 Accurately measure and record the cold temperature of the Model...

Page 72: ...2 24 Calibration...

Page 73: ...3 RoutineMaintenance...

Page 74: ...he tip of a flat blade screwdriver into the power module by the fuse holder assembly see Figure 3 1 Gently push in and to the left Release pressure on the assembly and its internal spring will push it...

Page 75: ...ctor Fuse Holder Assembly WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FO...

Page 76: ...it with the same type 3A 250V fast blow Keithley part number FU 99 1 CAUTION Do not use a fuse with a higher current rating than specified or instrument damage may occur If the instrument repeatedly b...

Page 77: ...acing Model 7700 amps fuses 1 Turn off the power and disconnect the power line and external connections from the Model 7700 2 Open the Model 7700 top cover 3 Locate the amps fuses for CH21 and CH22 se...

Page 78: ...the power and disconnect the power line and external connections from the Model 7702 2 Open the Model 7702 top cover 3 Locate the amps fuses for CH41 and CH42 see Figure 3 4 4 Remove the circuit board...

Page 79: ...Routine Maintenance 3 7 Figure 3 4 Model 7702 amps fuses CH42 Fuse CH41 Fuse Model 7702 TE122 TE121...

Page 80: ...ing procedures in Table 4 4 in Section 4 to determine if the battery requires replacement 2 Remove the Model 2700 top cover using the disassembly procedures in Section 5 3 Locate battery BT100 using t...

Page 81: ...4 Troubleshooting...

Page 82: ...ot equipped and or qualified it is strongly recommended that you send the unit back to the factory for repairs or limit repairs to the PC board replacement level Without proper equipment and training...

Page 83: ...ey However the second consecutive press of EXIT aborts the test and returns the instrument to normal operation DISP test The display test allows you to verify that each segment and annunciator in the...

Page 84: ...re 4 3 Analog circuitry block diagram Power supply The following information provides some basic circuit theory that can be used as an aid to troubleshoot the power supply A block diagram of the power...

Page 85: ...taken from a power transformer secondary at F1 and F2 and then routed to the display board Each DC supply uses a rectifier and a capacitive filter and many supplies use an IC regula tor Table 4 1 summ...

Page 86: ...manner key data is serially sent back to the digital section through the RXB line via TDO The 4MHz clock for the microcon troller is generated by crystalY401 O P T O I S O AT101 U150 U155 68306 P U13...

Page 87: ...Refer to Figure 4 2 for the following discussion on digital circuitry Microprocessor U135 is a 68306 microprocessor that oversees all operating aspects of the instrument The MPU has a 16 bit data bus...

Page 88: ...gital I O U146 U191 and U192 make up the digital input circuitry External triggering can occur on J1006 or J1007 U192 allows hardware handshaking to external controllers by gating off triggers U122 U1...

Page 89: ...SENSE LO Scanner Outputs DCV OHMS DCV 100 Current Shunts K103 R158 R205 R338 AC Switching Gain K102 U102 U103 U105 U112 U118 U111 U110 SSP Q101 Q102 DCV Divider R117 Q109 Q114 Q136 Ohms I Source Q119...

Page 90: ...is primarily made up of K102 U102 U103 U105 U112 U118 U111 and U110 Note that U111 is used for frequency adjustment The states of these analog switches vary from unit to unit Multiplexer and A D conve...

Page 91: ...gh 4MHz square wave Pulse train every 1msec Brief pulse train when front panel key is pressed Use front panel display test Digital 5V supply Display 37V supply Microcontroller RESET Controller 4MHz cl...

Page 92: ...OM OK Digital common 5V 5VD supply 5V 5VB supply 3V Low on power up then goes high Check for stuck bits Check for stuck bits 14 7456MHz Pulse train during RS 232 I O Pulse train during RS 232 I O Puls...

Page 93: ...T SET SET SET OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF ON ON K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 6 ACV and FREQ signal switching Range Q...

Page 94: ...9 Pin 3 switched to Pin 2 Table 4 8 4 signal switching Range Q101 Q102 Q114 Q136 Q109 K101 Q113 Q105 Q104 Q108 100 1k 10k 100k 1M 10M 100M ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF OFF OFF OFF OF...

Page 95: ...es Pin 8 to 7 Pin 3 to 4 K103 reset states Pin 8 to 9 Pin 3 to 2 Table 4 11 ACA signal switching Range K103 U105 pin 16 U105 pin 1 U111 pin 16 U105 pin 8 U103 pin 16 U103 pin 1 1A 3A Reset Reset ON ON...

Page 96: ...final ampli fier stage U166 Table 4 12 DCV signal multiplexing and gain Range Signal U163 U129 pin 1 U129 pin 8 U129 pin 9 Gain U166 100mV 1V 10V 100V 1000V S4 S4 S4 S4 S4 OFF OFF ON OFF ON OFF ON OF...

Page 97: ...multiplexing and gain Range Signal U163 U129 pin 1 U129 pin 8 U129 pin 9 Gain U166 100 1k 10k 100k 1M 10M 100M S4 then S7 S4 then S7 S4 then S7 S4 then S7 S4 then S7 S4 then S7 S4 then S7 OFF OFF OFF...

Page 98: ...eseated as follows 1 Turn off the power and disconnect the line cord and all other test leads and cables from the instrument 2 Remove the case cover as outlined in Section 5 3 Find the two firmware RO...

Page 99: ...5 Disassembly...

Page 100: ...when handling PC boards Wear cotton gloves Only handle PC boards by the edges and shields Do not touch any board traces or components not associated with repair Do not touch areas adjacent to electric...

Page 101: ...n Also ground yourself with a suitable wrist strap Handle the devices only by the body do not touch the pins Ground any printed circuit board into which a semiconductor device is to be inserted to the...

Page 102: ...ight ear to the right side of the chassis and the left ear to the left side of the chassis Each ear is marked RIGHT or LEFT on its inside surface 3 Remove Rear Bezel To remove the rear bezel loosen th...

Page 103: ...backplane connections J1008 and J1010 5 Remove the fastening screws that secure the motherboard to the chassis One of these screws is located along the left side of the unit towards the middle and it...

Page 104: ...sing Pull the display board from the front panel 4 Remove the switch pad by pulling it from the front panel Removing power components The following procedures to remove the power transformer and or po...

Page 105: ...the power transformer be sure to reconnect the black ground wire to the mounting stud on side of the chassis Be sure to install the bot tom case screws to assure a good case to chassis ground connecti...

Page 106: ...5 8 Disassembly...

Page 107: ...6 ReplaceableParts...

Page 108: ...parts contact your Keithley representative or the factory see inside front cover for addresses When ordering parts be sure to include the following information Instrument model number Model 2700 Instr...

Page 109: ...CERAMIC C 465 33P C138 139 142 127 149 152 155 159 163 144 CAP 0 1UF 20 50V CERAMIC C 418 1 C141 143 150 158 176 219 220 222 224 CAP 47P 5 100V CERAMIC C 465 47P C145 C240 CAP 1000pF 20 50V CERAMIC C...

Page 110: ...CHOKE 22UH CH 66 22 LS101 BEEPER 5V 30MA BRT1209P 06 C EM 5 Q101 Q102 N CHANNEL MOSFET TG 387 Q104 109 113 114 120 123 126 135 137 TRANS N CHANNEL JFET SNJ132199 TG 294 Q110 112 115 118 128 130 143 14...

Page 111: ...AL FILM R 391 100K R169 R369 R392 R396 R403 RES 4 75K 1 100MW THICK FILM R 418 4 75K R172 R339 R343 RES 1M 1 100MW THICK FILM R 418 1M R188 RES 49 9 1 125mW METAL FILM R 391 49 9 R189 RES 3 01K 1 125M...

Page 112: ...RES 1K 0 1 1 10W METAL FILM R 263 1K R310 RES 9 09K 0 1 1 10W METAL FILM R 263 9 09K R311 RES 392 1 100MW THICK FILM R 418 392 R312 R313 RES 332K 1 100MW THICK FILM R 418 332K R318 RES 73 2K 1 100MW...

Page 113: ...IFET OP AMP AD711JR IC 894 U141 IC PRECISION REFERENCE LM399 196 600A U142 IC OP AMP NE5534D IC 802 U144 IC 5V VOLTAGE REGULATOR LM2940CT IC 576 U146 U179 IC POS NAND GATES INVERT 74HCT14 IC 656 U147...

Page 114: ...02 Table 6 2 Model 2700 display board parts list Circuit Designation Description Keithley Part No C401 C402 C411 CAP 0 1UF 20 50V CERAMIC C 418 1 C403 C404 C405 C407 C409 C410 C412 CAP 0 1UF 10 25V CE...

Page 115: ...CS 612 1 J1011 CONN FEMALE 8 PIN CS 612 8 J1013 CONN RT ANGLE HEADER CS 1066 1 J1015 J1016 CONN 2 ROWS OF 16 PINS CS 736 4 L601 L602 FERRITE CHIP 600 OHM BLM32A07 CH 62 R600 R601 RES 4 75K 1 100MW THI...

Page 116: ...313C 1 COVER 2700 307B 1 DISPLAY LENS 2700 311A 2 FASTENER FA 230 2B 2 FOOT 428 319A 2 FOOT EXTRUDED FE 22A 2 FOOT RUBBER FE 6 1 FRONT PANEL 2001 302G 1 FRONT PANEL OVERLAY 2700 313A 1 FRONT REAR ROD...

Page 117: ...11 13 15 17 19 21 23 25 27 29 31 33 TRANS NPN SILICON TG 389 R1 RES 69 8K 1 1W THICK FILM R 418 69 8K R10 R11 R12 RES 4 7K 5 125MW METAL FILM R 375 4 7K R108 R109 R110 R111 R3 R150 RES 1K 1 100MW THIC...

Page 118: ...TG 388 Q35 37 39 41 43 45 47 51 53 55 57 59 65 TRANS NPN SILICON TG 389 Q5 P CHANNEL TMOSFET TG 392 Q62 64 66 68 70 72 74 76 78 80 82 84 86 TRANS PNP SILICON TG 388 Q63 65 67 69 71 73 75 77 79 81 83 8...

Page 119: ...RELAY RL 237 P1016 P1017 CONN RT ANGLE SEL CS 1061 1 CS 1062 Q1 P CHANNEL TMOSFET TG 392 R1 R7 R8 R4 R5 R6 R9 R10 R11 RES 1K 1 100MW THICK FILM R 418 1K R2 RES 10K 1 100MW THICK FILM R 418 10K R3 RES...

Page 120: ...Q143 145 147 149 151 153 155 157 159 161 TRANS PNP SILICON TG 388 Q144 146 148 150 152 154 156 158 160 162 TRANS NPN SILICON TG 389 Q163 165 167 169 171 173 175 177 179 181 TRANS PNP SILICON TG 388 Q1...

Page 121: ...A Speci cations...

Page 122: ...rrent 20 00000 mA 10 nA 0 2 V 60 15 300 40 500 40 50 5 C 100 0000 mA 100 nA 0 05 V 100 150 300 400 500 400 50 50 C 1 000000 A 1 0 A 0 3 V9 200 15 500 40 800 40 50 5 C 3 000000 A 10 A 1 0 V9 1000 15 12...

Page 123: ...s 10M 6 512 16 5 4 10 Thermocouple 6 516 30 24 1 Thermistor 6 512 16 50 40 1 5 512 16 100 80 0 1 5 516 17 250 200 0 1 5 517 480 400 0 1 4 517 2000 1800 0 01 4W Ohms 10M 6 516 1 4 1 1 10 6 516 15 1 1 5...

Page 124: ...ith 10M input resistance DMM 10G DMM on 10M and 100M ranges 4 Relative to calibration accuracy 5 For signal levels 500V add 0 02ppm V uncertainty for portion exceeding 500V 6 Specifications are for 4...

Page 125: ...ate and Period to 3 33 ppm 100 ppm 3 33 ppm MED 100ms gate 750 V 33 3 ppm 100 ppm 33 3 ppm FAST 10ms gate Additional Uncertainty of reading Low Frequency Uncertainty MED FAST 20 Hz 30 Hz 0 3 30 Hz 50...

Page 126: ...e except 100mV range 100mV range frequency must be 10Hz if input is 20mV 5 Applies to non sine waves 5Hz 6 For 1k unbalance in LO lead 7 Speeds are for 60Hz 50Hz operation using factory defaults opera...

Page 127: ...370mm deep 4 125 in 9 375 in 14 563 in SHIPPING WEIGHT 6 5kg 14 lbs DIGITAL I O 2 inputs 1 for triggering and 1 for hardware interlock 5 outputs 4 for Reading Limits and 1 for Master Limit Outputs ar...

Page 128: ...TION TIME 3ms CAPABILITIES CHANNELS 1 20 Multiplex one of 20 2 pole or one of 10 4 pole signals into DMM CHANNELS 21 22 Multiplex one of 2 2 pole current signals into DMM INPUTS MAXIMUM SIGNAL LEVEL C...

Page 129: ...WEEN ANY TERMINAL AND EARTH 109 200pF CROSS TALK 10MHz 50 Load 40dB INSERTION LOSS 50 Source 50 Load 0 1dB below 1MHz 3dB below 2MHz COMMON MODE VOLTAGE 300V between any terminal and chassis ENVIRONME...

Page 130: ...ERMINAL AND EARTH 109 400pF CROSS TALK 1 MHz 50 Load 40dB INSERTION LOSS 50 Source 50 Load 0 35dB below 1MHz 3dB below 2MHz COMMON MODE VOLTAGE 300V between any terminal and chassis ENVIRONMENTAL OPER...

Page 131: ...At Maximum Signal Levels 105 closures CHANNEL RESISTANCE per conductor 1 CONTACT POTENTIAL 4 V per contact OFFSET CURRENT 100pA ACTUATION TIME 3ms ISOLATION Channel to Channel 109 50pF Common Mode 109...

Page 132: ...to 5 0002V DC current and resistance calculations are performed in exactly the same manner using the pertinent specifications ranges and input signal values Calculating AC characteristics accuracy AC...

Page 133: ...032dBm dBm and dB for other voltage inputs can be calculated in exactly the same manner using pertinent specifications ranges and reference impedances Calculating dB characteristics accuracy The relat...

Page 134: ...m V must be added to DCV specifica tions for voltages over 500V Before calculating accuracy study the associated specifications very carefully to see if any derating factors apply Optimizing measureme...

Page 135: ...oltage DC current and resistance Select 3 1 2 digits 0 01 PLC filter OFF fixed range AC voltage and AC current Select 3 1 2 digits 0 01 PLC filter OFF fixed range Temperature Select 3 1 2 digits 0 01...

Page 136: ...A 16 Specifications...

Page 137: ...B CalibrationReference...

Page 138: ...es and CODE CODE up to 8 char string Calibration code or password default KI002700 COUNt Request the number of times the unit has been calibrated INITiate Initiate calibration LOCK Lock out calibratio...

Page 139: ...EP8 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 1kHz step STEP14 1V AC at 3Hz step1 STEP15 1V AC...

Page 140: ...ore sending any other comprehensive or manu facturing calibration command The default calibration code is KI002700 NOTES The CODE command should be sent only once before performing either the com preh...

Page 141: ...her 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 comprehensive or manufactu...

Page 142: ...ck state SAVE CALibration PROTected SAVE Purpose To save calibration constants in EEROM after the calibration procedure Format cal prot save Parameter None Description The SAVE command stores internal...

Page 143: ...meters must be delimited by commas Example CAL PROT DATE 1999 12 16 Send cal date 12 16 1999 CAL PROT DATE Request cal date NDUE CALibration PROTected NDUE Purpose To send the next calibration due dat...

Page 144: ...sending this command Example CAL PROT DC STEP1 Perform short circuit calibration Table B 2 DC calibration commands Command Description Parameter limits CALibration PROTected DC STEP1 Front terminal s...

Page 145: ...on step Format cal prot dc step3 Cal_voltage Parameter Cal_voltage 9 to 11 V Description STEP3 programs the 10V DC comprehensive calibration step The allowable range of the calibration voltage paramet...

Page 146: ...t dc step6 Cal_resistance Parameter Cal_resistance 900 to 1 1E3 Description STEP6 programs the 1k 4 wire resistance comprehensive calibration step The allowable range of the calibration resistance par...

Page 147: ...cal prot dc step9 Cal_resistance Parameter Cal_resistance 900E3 to 1 1E6 Description STEP9 programs the 1M comprehensive calibration step The allowable range of the calibration resistance parameter is...

Page 148: ...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 the 1A comprehe...

Page 149: ...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 AC at 1kHz calibr...

Page 150: ...ion 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 step 12 1A AC at...

Page 151: ...and AC STEP 15 commands program the two man ufacturing AC calibration steps The appropriate signal must be connected to the instrument when programming each step as summarized by the parameters listed...

Page 152: ...n CALibration Calibration root command PROTected All commands in this subsystem are protected by the calibration lock except queries and CODE CODE up to 8 char string Send calibration code Default KI0...

Page 153: ...mmand 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 CODE KI002700 Send defa...

Page 154: ...card calibration date is automatically set to the Model 2700 real time clock date when the card is calibrated Example CAL PROT CARD1 DATE Request card 1 cal date INIT CALibration PROTected CARD1 INIT...

Page 155: ...Model 7700 calibration lock status Format cal prot card1 lock Response 0 Calibration locked 1 Calibration unlocked Description The LOCK query requests status from the Model 2700 on Model 7700 calibrat...

Page 156: ...ve card calibration constants STEP0 CALibration PROTected CARD1 STEP0 Purpose To perform Model 7700 calibration Format cal prot card1 step0 temp Parameter temp Cold calibration temperature C Descripti...

Page 157: ...full scale error 406 1k 2 w zero error 407 10k 2 w zero error 408 100k 2 w zero error 409 10M 2 w zero error 410 10M 2 w full scale error 411 10M 2 w open error 412 1k 4 w zero error 413 10k 4 w zero...

Page 158: ...750 vac noise error 467 Post filter offset error 468 1 aac zero error 469 1 aac full scale error 470 3 aac zero error 471 3 aac full scale error 472 Input time constant error 473 Frequency gain error...

Page 159: ...Q 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 exact nature of the error Detecting calibration step completion W...

Page 160: ...e 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 serial polling to...

Page 161: ...C CalibrationProgram Appendix C Page 1 Friday February 18 2000 7 45 AM...

Page 162: ...rements 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 later HP style Universal Language Driver C...

Page 163: ...has been changed modify the CAL PROT CODE parameter accordingly 7 Run the program and follow the prompts on the screen to perform calibration Program C 1 Model 2700 calibration program Model 2700 cal...

Page 164: ...4 STBY PRINT Connect calibrator to J and INPUT LO jacks GOSUB KeyCheck PRINT 1 OUTPUT 4 Msg PRINT 1 OUTPUT 4 OPER END SELECT IF I 2 THEN GOSUB Settle PRINT 1 OUTPUT 16 C Cmd OPC Send cal command to 2...

Page 165: ...NPUT 2 E Err IF E 0 THEN PRINT Err GOTO ErrCheck Display error RETURN Settle Calibrator settling routine DO PRINT 1 OUTPUT 4 ISR Query status register PRINT 1 ENTER 4 INPUT 2 s LOOP UNTIL s AND H1000...

Page 166: ...KHZ AC STEP4 DATA OUT 1 V 50 KHZ AC STEP5 DATA OUT 10 V 1 KHZ AC STEP6 DATA OUT 10 V 50 KHZ AC STEP7 DATA OUT 100 V 1 KHZ AC STEP8 DATA OUT 100 V 50 KHZ AC STEP9 DATA OUT 700 V 1 KHZ AC STEP10 DATA OU...

Page 167: ...gram 4 9 Analog signal switching states 4 13 Assembly drawings 5 3 B battery replacement 3 8 C Calibration 2 1 calibration aborting 2 6 AC current 2 12 AC voltage 2 11 code 2 4 comprehensive 2 5 consi...

Page 168: ...DC characteristics accuracy A 12 DC current A 14 A 15 verifying Model 2700 1 11 verifying Model 7700 1 22 DC voltage A 14 A 15 Verifying Model 2700 1 8 verifying Model 7700 1 18 DCA signal multiplexi...

Page 169: ...Microcontroller 4 6 Microprocessor 4 7 Model 7700 amps fuse 3 5 Model 7700 calibration commands B 16 Model 7702 amps fuses 3 7 Module slot control 4 8 Motherboard removal 5 4 Multiplexer and A D conve...

Page 170: ...5 3 Status byte EAV Error Available bit B 23 Switching device locations 4 17 T Temperature A 14 A 15 temperature RTD Model 2700 1 16 RTD Model 7700 1 29 thermocouple Model 2700 1 15 thermocouple Mode...

Page 171: ...d Will not read applied input Calibration only Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement including all instru...

Page 172: ...Service fm Page 2 Friday February 18 2000 7 44 AM...

Page 173: ......

Page 174: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...

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