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Troubleshooting

4-7

Display

DS401 is the display module, which can display up to 12 alpha-numeric characters and

includes the various annunciators.

The display uses a common multiplexing scheme with each character refreshed in sequence.

U402 and U403 are the drivers for the display characters and annunciators. Note that data for
the drivers are serially transmitted from the microcontroller (MOSI and PC1).

Filament voltage for the display is derived from the power supply transformer (F1 and F2).

The display drivers r37VDC and +5VDC, which are supplied by U144 (+5VD) and
U101 (+37V).

Key matrix

The front panel keys (S401-S430) are organized into a row-column matrix to minimize the

number of microcontroller peripheral lines required to read the keyboard. A key is read by
strobing the columns and reading all rows for each strobed column. Key-down data is inter-
preted by the display microcontroller and sent back to the main microprocessor using propri-
etary encoding schemes.

Digital circuitry

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 and provides an 19-bit address bus. It also has parallel and serial
ports for controlling various circuits. For example, the RXDA, TXDA, RXDB and TXDB lines
are used for the RS-232 interface.

The MPU clock frequency of 14.7456MHz is controlled by crystal Y101. MPU RESET is

performed momentarily on power-up.

Memory circuits

ROMs U156 and U157 store the firmware code for instrument operation. U157 stores the

D0-D7 bits of each data word, and U156 stores the D8-D15 bits.

RAMs U151 and U152 provide battery backed operating storage. U152 stores the D0-D7

bits of each data word, and U151 stores the D8-D15 bits.

Semi-permanent storage facilities include NVRAM U136. This IC stores such information

as instrument setup and calibration constants. Data transmission from this device is done in a
serial fashion.

U171, Y103, and BT100 make up the battery watchdog control, along with the real-time

clock. U171 automatically senses when the +5VD supply is being powered down and then
switches to BT100 for power.

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Содержание 2700

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 16: ......

Страница 17: ...1 PerformanceVeri cation...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 48: ...1 32 Performance Verification...

Страница 49: ...2 Calibration...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 72: ...2 24 Calibration...

Страница 73: ...3 RoutineMaintenance...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 81: ...4 Troubleshooting...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 99: ...5 Disassembly...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 106: ...5 8 Disassembly...

Страница 107: ...6 ReplaceableParts...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 121: ...A Speci cations...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 136: ...A 16 Specifications...

Страница 137: ...B CalibrationReference...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 173: ......

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

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