Keithley 2182 Service Manual
  1. Manuals
  2. Brands
  3. Keithley Manuals
  4. Measuring Instruments
  5. 2182
  6. Service manual

Keithley 2182 Service Manual

Nanovoltmeter
Hide thumbs Also See for 2182:
Table of Contents

Advertisement

Quick Links

Download this manual See also: User Manual, Quick Reference Manual
www.keithley.com
Model 2182/2182A Nanovoltmeter
Service Manual
2182A-902-01 Rev. A / July 2004
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

Advertisement

Table of Contents
loading

Related Manuals for Keithley 2182

Summary of Contents for Keithley 2182

  • Page 1 Model 2182/2182A Nanovoltmeter Service Manual 2182A-902-01 Rev. A / July 2004 G R E A T E R M E A S U R E C O N F I D E N C E...
  • Page 2 Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, software, rechargeable batteries, diskettes, and documentation. During the warranty period, Keithley Instruments will, at its option, either repair or replace any product that proves to be defective.
  • Page 3 Model 2182/2182A Nanovoltmeter Service Manual This Service Manual supports both the Models 2182 and2182A. References to the Model 2182 also apply to the Model 2182A. ©2004, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. First Printing, July 2004 Document Number: 2182A-902-01 Rev. A...
  • Page 4 Revision A (Document Number 2182A-902-01) .............. July 2004 All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand names are trademarks or registered trademarks of their respective holders.

  • Page 5: Safety Precautions

    Service personnel are trained to work on live circuits, perform safe installations, and repair products. Only properly trained service personnel may perform installation and service procedures. Keithley Instruments products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664.
  • Page 6 (note that selected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product). If you are unsure about the applicability of a replacement component, call a Keithley Instruments office for information.

  • Page 7: Table Of Contents

    Table of Contents Performance Verification Introduction ................Verification test requirements ............ Environmental conditions ........... Warm-up period ..............Line power ................Recommended test equipment ..........Verification reading limits ..........Restoring factory defaults ........... Auto-calibration (ACAL) ........... Performing the verification test procedures ....... Test summary ..............
  • Page 8 Troubleshooting Introduction ................Repair considerations ..............Power-on self-test ............... Front panel tests ..............KEY test ................DISP test ................Principles of operation ..............Power supply ............... Display board ..............Digital circuitry ..............Analog circuitry ..............Troubleshooting ................ 4-10 Display board checks ............4-10 Power supply checks ............
  • Page 9 Replaceable Parts Introduction ................Parts lists ..................Ordering information ..............Factory service ................Component layouts ..............Specifications Calibration Reference Introduction ................Command summary ..............Default calibration constants and tolerances ......Miscellaneous commands ............:CODE ................:COUNT? ................:LOCK ................:SAVE ................:DATE ................

  • Page 11: List Of Illustrations

    List of Illustrations Performance Verification Figure 1-1 Connections for 100mV-100V range accuracy ..... Figure 1-2 Connections for 10mV range accuracy ........Figure 1-3 Connections for temperature accuracy verification ....Figure 1-4 Connections for analog output accuracy ......1-11 Calibration Figure 2-1 Low-thermal short connections ..........

  • Page 12: List Of Tables

    List of Tables Performance Verification Table 1-1 Recommended verification equipment ........Table 1-2 Input cable color codes ............Table 1-3 DC voltage measurement accuracy limits ......Table 1-4 Temperature measurement accuracy limits ......1-10 Table 1-5 Analog output accuracy limits ..........1-11 Calibration Table 2-1...
  • Page 13 Replaceable Parts Table 6-1 Motherboard parts list ............Table 6-2 Motherboard parts list (continued) ......... Table 6-3 Motherboard parts list (continued) ......... Table 6-4 Motherboard parts list (continued) ......... Table 6-5 Motherboard parts list (continued) ......... Table 6-6 Motherboard parts list (continued) ......... Table 6-7 Display board parts list ............

  • Page 14: Performance Verification

    Performance Verification Performance Verification...

  • Page 15: Introduction

    Performance Verification Introduction Use the procedures in this section to verify that Model 2182 accuracy is within the limits stated in the instrument’s one-year accuracy specifications. You can perform these verification procedures: • When you first receive the instrument to make sure that it was not damaged during shipment.

  • Page 16: Warm-Up Period

    Line power The Model 2182 requires a nominal line voltage of 100, 120, 220, or 240V and a line frequency of 50 to 60Hz or 400Hz. Verification tests must be performed with the correct line voltage. If necessary, change the line voltage setting as covered in...

  • Page 17: Verification Reading Limits

    Performance Verification Verification reading limits The verification limits stated in this section have been calculated using only the Model 2182 one-year accuracy specifications, and they do not include test equipment uncertainty. If a particular measurement falls outside the allowable range, recalculate new limits based both on Model 2182 specifications and corresponding test equipment specifications.

  • Page 18: Performing The Verification Test Procedures

    Be sure to restore factory front panel defaults, and perform a full auto-calibration (ACAL), as outlined above. • Make sure that the Model 2182 and test equipment are properly warmed up, and that the test equipment is connected to the appropriate Model 2182 jacks. •...

  • Page 19: Verification Procedures

    The test involves applying precise DC voltages and then verifying that the Model 2182 voltage readings are within required limits. 100mV – 100V range accuracy With the power off, connect the DC calibrator to CHANNEL 1 of the Model 2182 input jack, as shown in Figure 1-1.
  • Page 20 Set the DC calibrator output voltage to the indicated value. • Verify that the Model 2182 voltage reading is within the limits given in the table. Repeat step 7 for negative source voltages with the same magnitudes as those listed in Table 1-3.

  • Page 21: Temperature Measurement Accuracy

    However, the following procedure is provided for those who wish to independently measure temperature measurement accuracy. With the power off, connect the temperature calibrator to the Model 2182 CHANNEL 1 input jack, as shown in Figure 1-3.
  • Page 22 Press SHIFT then TCOUPL, then use the RANGE and left and right arrow keys to select the following: • UNITS: C • JUNC: SIM, set to 0°C • TYPE: J • SENS: TCOUPLE Select the Model 2182 TEMP 1 function.

  • Page 23: Analog Output Accuracy

    Be sure that DC voltage measurement accuracy is within required limits before attempting this procedure. With the power off, connect the Model 2182 CHANNEL 1 input jack to the DC voltage calibrator, and connect the rear panel ANALOG output jack to the digital multimeter, as...
  • Page 24 • M: +1.0000000 • B: +00.000000 Set the calibrator voltage to 0.00000V, then enable the Model 2182 REL mode. Also enable REL on the digital multimeter. Verify analog output accuracy for each of the voltages listed in Table 1-5. For each test point: •...
  • Page 25 1-12 Performance Verification...

  • Page 26: Calibration

    Calibration Calibration...

  • Page 27: Introduction

    Line Power The Model 2182 requires a nominal line voltage of 100, 120, 220, or 240V and a line frequency of 50 to 60Hz or 400Hz. Calibration must be performed with the correct line voltage. If necessary, change the line voltage setting as covered in...

  • Page 28: Calibration Considerations

    • Keep test connections and all equipment away from drafts to avoid thermal drift. • Do not connect test equipment to the Model 2182 through a scanner or other switching equipment. • If an error occurs during calibration, the Model 2182 will generate an appropriate error message.
  • Page 29 Calibration Calibration dates Choose the DATES selection in the calibration menu to display the date the Model 2182 was calibrated and the date calibration is due. The unit will display these dates as in the examples below: DATE:12/07/97 NDUE:12/08/98 Calibration count Choose the COUNT selection in the calibration menu to display the number of times the unit was calibrated.

  • Page 30: Calibration Errors

    (Use the *STB? query to request the status byte.) Query the instrument for the type of error by using the :SYST:ERR? query. The Model 2182 will respond with the error number and a text message describing the nature of the error. See Appendix B for details.

  • Page 31: Aborting Calibration

    The calibration procedures described below are generally the only instrument calibration required in the field. If, however, the Model 2182 has been repaired, the factory calibration procedures described in Factory calibration at the end of this section should be performed instead.
  • Page 32 Calibration Preparing the Model 2182 for calibration Turn on the Model 2182, and allow it to warm up for at least 2-1/2 hours before performing the calibration procedure. Start the calibration process as follows: A. Access the calibration menu by pressing SHIFT then CAL.
  • Page 33 After the front panel short and open procedure, the unit will prompt you for the first DC voltage: 10.000000 V Connect the calibrator to the CHANNEL 1 input of the Model 2182 using the low- thermal cable, as shown in Figure 2-2.
  • Page 34 At the end of the calibration procedure, the instrument will display the CALIBRATION COMPLETE message. Press ENTER to continue, and the Model 2182 will prompt you to enter the calibration date and the calibration due date. Set these dates as follows: At the CAL DATE: mm/dd/yy prompt, use the left and right arrow keys, and the RANGE keys to set the calibration date, then press ENTER.

  • Page 35: Remote Calibration

    Select the DCV1 function. Make sure the primary address of the Model 2182 is the same as the address specified in the program that you will be using to send commands. (Use the GPIB key.) Unlock the calibration function by sending this command: :CAL:PROT:CODE 'KI002182' (The above command shows the default code, KI002182.
  • Page 36 :CAL:PROT:DC:STEP2 DC volts calibration After front panel short and open steps, do the following: Connect the calibrator to the CHANNEL 1 input of the Model 2182 as shown in Figure 2-2. (SeeTable 2-3 for wire colors.) Allow two minutes for thermal equilibrium.

  • Page 37: Factory Calibration

    Table 2-6 Recommended factory calibration equipment Description Manufacturer/model Specifications* DC Calibrator Fluke 5700A 1V: ±7ppm 10V: ±5ppm Low Thermal Input Cable Keithley 2107 Low Thermal Short Keithley 2188 BNC-to-Clip Leads * 90-day total uncertainty at specified output.

  • Page 38: Remote Factory Calibration

    RS-232 port using a straight-through 9-pin to 9-pin cable (use a 9-25-pin adapter if necessary). Press in and hold the STEP key, then turn on the Model 2182, and allow it to warm up for 2-1/2 hours before performing calibration.

  • Page 39: Figure 2-3 Connections For Factory Dc Volts Calibration

    2-14 Calibration Precalibration Connect the calibrator to CHANNEL 1 of the Model 2182 input jack using the low- thermal cable, as shown in Figure 2-3. Wait two minutes to allow for thermal equilibrium before proceeding. (See Table 2-3 for Model 2107 cable connections.) Set the calibrator to output DC volts, and turn external sense off.

  • Page 40: Figure 2-4 Low Thermal Short Connections For Factory Calibration

    2-4. Wait at least three minutes before proceeding to allow for thermal equilibrium. Send the following command: :CAL:PROT:DC:STEP1 After the Model 2182 completes this step, remove the low-thermal short, and send this command: :CAL:PROT:DC:STEP2 Figure 2-4 Low thermal short connections for factory calibration...
  • Page 41 2-16 Calibration Analog output calibration Connect the Model 2182 analog output to CHANNEL 1 of the front panel input jack, as shown in Figure 2-5. Send the following command to calibrate the analog output: :CAL:PROT:DC:STEP5 Figure 2-5 Connections for analog output calibration...
  • Page 42 Calibration 2-17 Saving calibration constants After completing the calibration procedure, send the following command to save the new calibration constants: :CAL:PROT:SAVE NOTE Calibration constants will not be saved unless the :SAVE command is sent. Calibration constants can be returned using the :CAL:PROT:DATA? command. For details, see “Miscellaneous commands,...
  • Page 43 2-18 Calibration...

  • Page 44: Routine Maintenance

    Routine Main- tenance Routine Maintenance...

  • Page 45: Introduction

    The power line fuse is accessible from the rear panel, just adjacent to the AC power receptacle in the power module (see Figure 3-1). Figure 3-1 Line fuse replacement Model 2182 WARNING: WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. MADE IN ANALOG OUTPUT U.S.A.

  • Page 46: Line Voltage Selection

    (front and rear) before changing the line voltage. The Model 2182 can be set to operate on either 100V, 120V, 220V, or 240V nominal line voltages. You can change the line voltage as follows: Carefully pry the locking tab that secures the fuse carrier to the power module.
  • Page 47 Routine Maintenance...

  • Page 48: Troubleshooting

    Troubleshoot- Troubleshooting...

  • Page 49: Introduction

    Troubleshooting Introduction This section of the manual will assist you in troubleshooting and repairing the Model 2182. Included are self-tests, test procedures, troubleshooting tables, and circuit descriptions. Note that disassembly instructions are located in Section 5, while component layout drawings may be...

  • Page 50: Power-On Self-Test

    Troubleshooting Power-on self-test During the power-on sequence, the Model 2182 will perform a checksum test on its EPROM and test its RAM. If one of these tests fails, the instrument will lock up. Front panel tests There are two front panel tests: one to test the functionality of the front panel keys and one to test the display.

  • Page 51: Principles Of Operation

    Troubleshooting Principles of operation The following information is provided to support the troubleshooting tests and procedures covered in this section of the manual. Refer to the following block diagrams: Figure 4-1 — Power supply block diagram Figure 4-2 — Digital circuitry block diagram Figure 4-3 —...

  • Page 52: Display Board

    Troubleshooting AC power is applied to the AC power module receptacle. Power is routed through the line fuse and line voltage selection switch of the power module to the power transformer. The power transformer has several secondary windings for the various supplies. AC voltage for the display filaments is taken from a power transformer secondary at F1 and F2, and then routed to the display board.

  • Page 53: Digital Circuitry

    Troubleshooting Microcontroller U401 is the display board microcontroller that controls the display and interprets key data. The microcontroller uses three internal peripheral I/O ports for the various control and read functions. Display data is serially transmitted to the microcontroller from the digital section via the TXB line to the microcontroller RDI terminal.

  • Page 54: Analog Circuitry

    Troubleshooting Memory circuits ROMs U102 and U103 store the firmware code for instrument operation. U103 stores the D0-D7 bits of each data word, and U103 stores the D8-D15 bits. RAMs U104 and U105 provide temporary operating storage. U104 stores the D0-D7 bits of each data word, and U105 stores the D8-D15 bits.
  • Page 55 Troubleshooting Figure 4-3 Simplified schematic of analog circuitry...
  • Page 56 Troubleshooting Input signal conditioning Protection circuits The CH1 HI, CH2 HI, and CH2 LO inputs have protection circuits designed to prevent circuit damage from over-voltage signal conditions. Q666 and Q667 provide protection for CH1 HI, while Q661 and Q662 provide similar protection for CH2 HI. Signal paths There are two basic signal paths: DIV_COM (divider common) and LN_COM (low noise common).

  • Page 57: Troubleshooting

    4-10 Troubleshooting Circuit gain Table 4-1 summarizes the circuit gain factors for the various ranges. Table 4-1 Circuit gain factors Range Divider attenuation Preamp gain Multiplexer gain 100V 100:1 100mV X100 10mV X100 Troubleshooting Troubleshooting information for the various circuits is summarized below. Use the “Principles of operation”...

  • Page 58: Power Supply Checks

    Troubleshooting 4-11 Power supply checks Power supply problems can be checked out using Table 4-3. Table 4-3 Power supply checks Step Item/component Required condition Remarks Line fuse Check continuity. Remove to check. Line voltage 120V/240V as required. Check power module position. Line power Plugged into live Check for correct power-up...

  • Page 59: Digital Circuit Checks

    4-12 Troubleshooting Digital circuit checks Digital circuit problems can be checked out using Table 4-4. Table 4-4 Digital circuit checks Step Item/component Required condition Remarks Power-on test RAM OK, ROM OK. Verify that RAM and ROM are functional. TP301 Digital common. All signals referenced to digital common.

  • Page 60: Analog Circuit Checks

    Troubleshooting 4-13 Analog circuit checks Table 4-5 summarizes checks for the analog circuits. These tests involve applying specific test voltages to the channel 1 input terminals and measuring voltages at the indicated test points. See Figure 1-1 Section 1 for DC voltage input test connection. Table 4-5 Analog circuit checks Step...

  • Page 61: Analog Signal Switching States

    4-14 Troubleshooting Analog signal switching states Table 4-6 Table 4-7 provide switching states of the various ICs and transistors for the basic measurement functions and ranges. These tables can be used to assist in tracing an analog signal from the channel 1 and channel 2 inputs to the A/D multiplexer. Table 4-6 Signal multiplexing gain switching U626...

  • Page 62: Table 4-7 Input Protection And Low-Noise Preamplifier Analog Switching States

    Troubleshooting 4-15 Table 4-7 Input protection and low-noise preamplifier analog switching states Function U645 U645 U645 Q666 Q667 Q664 Q665 Q672 Q673 Q674 and Range Pin 1, 16 Pin 8 Pin 9 DCV1: 10mV 100mV 100V DCV2: Q661 Q662 Q671 100mV...

  • Page 63: No Comm Link Error

    4-16 Troubleshooting No comm link error A “No Comm Link” error indicates that the front panel processor has stopped communicating with the main processor, which is located on the motherboard. This error indicates that one of the main processor ROMs may require re-seating in its socket. ROMs may be reseated as follows: Turn off the power, and disconnect the line cord and all other test leads and cables from the instrument.

  • Page 64: Disassembly

    Disassembly Disassembly...

  • Page 65: Introduction

    Disassembly Introduction This section explains how to handle, clean, and disassemble the Model 2182. Disassembly drawings are located at the end of this section. Handling and cleaning To avoid contaminating PC board traces with body oil or other foreign matter, avoid touching the PC board traces while you are repairing the instrument.

  • Page 66: Static Sensitive Devices

    Use the following assembly drawings to assist you as you disassemble and reassemble the Model 2182. Also, refer to these drawings for information about the Keithley part numbers of most mechanical parts in the unit. The drawings are located at the end of this section.

  • Page 67: Disassembly

    Disassembly Disassembly Case cover removal Follow the steps below to remove the case cover to gain access to internal parts. WARNING Before removing the case cover, disconnect the line cord and any test cables from the instrument. Remove Handle — The handle serves as an adjustable tilt-bail. Adjust its position by gently pulling it away from the sides of the instrument case and swinging it up or down.

  • Page 68: Motherboard Removal

    Disassembly Motherboard removal Perform the following steps to remove the motherboard. This procedure assumes that the case cover is already removed. Remove the IEEE-488, RS-232 and BNC jack fasteners. The IEEE-488 and the RS-232 connectors each have two nuts that secure the connectors to the rear panel, while the BNC jack has a single nut.

  • Page 69: Main Cpu Firmware Replacement

    Disassembly Main CPU firmware replacement Changing the firmware may be necessary as upgrades become available. The firmware revision levels for the main and front panel CPUs are displayed during the power-on sequence. (The main firmware revision level is displayed on the left; the front panel firmware revision level is displayed on the right.) For example: REV: A01 A02 indicates a main firmware revision level of A01 and a front panel firmware revision level of A02.

  • Page 70: Changing Trigger Link Lines

    Disassembly Changing trigger link lines The Model 2182 uses two lines of the TRIGGER LINK rear panel connector as External Trigger (EXT TRIG) input and Voltmeter Complete (VMC) output. At the factory, line 1 is configured as VMC and line 2 as EXT TRIG. Line 1, 3 or 5 of the Trigger Link can be configured as VMC, while line 2, 4 or 6 can be configured as EXT TRIG.

  • Page 71: Removing Power Components

    Disassembly Removing power components The following procedures to remove the power transformer and/or power module require that the case cover and motherboard be removed, as previously explained. WARNING Disconnect the line cord and input connector before removing the case cover. Power transformer removal Perform the following steps to remove the power transformer: Remove motherboard.

  • Page 72: Instrument Reassembly

    Disassembly Instrument reassembly Reassemble the instrument by reversing the previous disassembly procedures. Make sure that all parts are properly seated and secured, and that all connections are properly made. WARNING To ensure continued protection against electrical shock, verify that power line ground (green and yellow wire attached to the power module) the power transformer ground (black wire), and input jack ground (green wire) are securely connected to the chassis.
  • Page 73 5-10 Disassembly...

  • Page 79: Replaceable Parts

    Replaceable Parts Replaceable Parts...

  • Page 80: Introduction

    Model 2182. Parts lists The electrical parts lists for the Model 2182 are shown in tables at the end of this section. For part numbers to the various mechanical parts and assemblies, use the Miscellaneous parts list and the assembly drawings provided at the end of...
  • Page 81 Replacement Parts Table 6-1 Motherboard parts list Circuit designation Description Keithley part no. C101-113,130-132,136-141,150,152,501- CAP, .1UF, 10%, 25V, CERAMIC C-495-.1 C114,C116,C117,C323 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1 C118,134,515,520,751,758,761,763,765 CAP, 47P, 5%, 100V, CERAMIC C-465-47P C119,C120 CAP, 22P 5%, 100V CERAMIC...
  • Page 82 Replacement Parts Table 6-1 Motherboard parts list (continued) Circuit designation Description Keithley part no. CN701 MODIFIED POTTING BOX 2182-321A CN702 SHIELD CN-68 CN703 SHIELD CN-70 CR101,102,316,317,654 DIODE, DUAL SWITCHING, BAV99L RF-82 CR301-309,311-314 DIODE, SWITCHING, MMSD914T19 RF-112 CR310 DIODE,BRIDGE,VM18 RF-52 CR315...
  • Page 83 Replacement Parts Table 6-1 Motherboard parts list (continued) Circuit designation Description Keithley part no. Q619,Q652 TRANS, NPN PAIR, LM394 TG-142 Q620,Q621 TRANS, N CHANNEL JFET, SST4118 TG-347 Q624,U651 SELECTED TRANSISTOR 2010-600A Q627,Q630 TRANS,N CHANNEL JFET TG-225 Q633,Q634,Q638,Q670,Q639,Q507 TRANS, N CHANNEL JFET, SNJ132199...
  • Page 84 Replacement Parts Table 6-1 Motherboard parts list (continued) Circuit designation Description Keithley part no. R501 RES, 1.28M, .1%, 1/8W METAL FILM R-176-1.28M R505 RES, 5.11K, 1%, 100MW, THICK FILM R-418-5.11K R506,R691 RES, 470,5%, 125MW, METAL FILM R-375-470 R508,R625 RES, 24.9K, 1%, 100MW, THICK FILM R-418-24.9K...
  • Page 85 Replacement Parts Table 6-1 Motherboard parts list (continued) Circuit designation Description Keithley part no. R670,R673,R687,R688 RES, 2.49K, 1%, 125MW, METAL FILM R-391-2.49K R671,672,689,690,694,695 RES, 1M, 5%, 125MW, METAL FILM R-375-1M R681 RES, 20K,1%,125MW, METAL FILM R-391-20K R692 RES, 4.99K, 1%, 125mW,METAL FILM R-391-4.99K...
  • Page 86 Replacement Parts Table 6-1 Motherboard parts list (continued) Circuit designation Description Keithley part no. U151,U613,U629,U307,U308 IC,OP-AMP,AD707, IC-712 U301 IC,+5V REGULATOR,500mA,7805 IC-93 U302 IC,POS VOLTAGE REG +15V,500MA,78M15 IC-194 U303 IC,NEG VOLTAGE REG -15V,500MA,79M15 IC-195 U304 IC, LOW DROPOUT REGULATOR, LM295T IC-962...
  • Page 87 Replacement Parts Table 6-1 Motherboard parts list (continued) Circuit designation Description Keithley part no. VR151,152,303,602,608,650,603 DIODE,ZENER 5.1V, BZX84C5V1 DZ-88 VR301,VR302,VR655,VR656 DIODE, ZENER 11V,MMSZ11T1 DZ-103 VR304 DIODE ZENER DZ-121 VR601,VR604,VR613,VR614 DIODE, ZENER 3.3V, MMBZ5226BL DZ-94 VR609,VR610,VR651,VR652 DIODE ZENER 12V, MMSZ12T1 DZ-112...
  • Page 88 6-10 Replacement Parts Table 6-3 Connector board parts list Circuit designation Description Keithley part no. CONNECTOR CS-236 CONNECTOR, HOUSING CS-638-3 CONNECTOR CS-933 C670 CAP,.1UF, 20%,50V,CERAMIC C-418-.1 U644 IC, CENTIGRADE TEMP SENSOR LM35DM IC-906 Table 6-4 Mechanical parts list Toy. Description Keithley part no.

  • Page 92: Specifications

    Specifica- tions Specifications...

  • Page 93: Noise Performance

    2182A Nanovoltmeter Specifications VOLTS SPECIFICATIONS (20% OVER RANGE) CONDITIONS: 1PLC with 10 reading digital filter or 5PLC with 2 reading digital filter. ACCURACY: ±(ppm of reading + ppm of range) (ppm = parts per million) (e.g., 10ppm = 0.001%) TEMPERATURE CHANNEL 1 24 Hour 90 Day...
  • Page 94 2182A Nanovoltmeter Specifications Temperature (Thermocouples) (DISPLAYED IN °C, °F, OR K. ACCURACY BASED ON ITS-90, EXCLUSIVE OF THERMOCOUPLE ERRORS.) ACCURACY 90 Day/1 Year 23° ±5°C Relative to Simulated TYPE RANGE RESOLUTION Reference Junction ±0.2°C -200 to +760°C 0.001°C ±0.2°C -200 to +1372°C 0.001°C ±0.2°C -200 to +1300°C...

  • Page 95: Analog Output

    2107-4: Low Thermal Input Cable with spade lugs, 1.2m (4 ft). User manual, service manual, contact cleaner, line cord, alligator clips. REMOTE INTERFACE ACCESSORIES AVAILABLE Keithley 182 emulation. GPIB (IEEE-488.2) and RS-232C. 2107-30: Low Thermal Input Cable with spade lugs, 9.1m (30 ft) SCPI (Standard Commands for Programmable Instruments).

  • Page 96: Calibration Reference

    Calibration Reference Calibration Reference...

  • Page 97: Introduction

    Calibration Reference Introduction This appendix contains detailed information on the various Model 2182 remote calibration commands, calibration error messages, and methods to detect the end of each calibration step. Section 2 of this manual covers detailed calibration procedures.

  • Page 98: Command Summary

    Calibration Reference Command summary Table B-1 summarizes Model 2182 calibration commands. These commands are covered in detail in the following paragraphs. Table B-1 Remote calibration command summary Command Description :CALibration :PROTected :CODE <name> Send the code to unlock calibration. Default: 'KI002182'.

  • Page 99: Default Calibration Constants And Tolerances

    Calibration Reference Default calibration constants and tolerances Default calibration constants and tolerances for the Model 2182 are listed in Table B-2. The tolerances for user-entered values are expressed as a percentage (10%). For example, for the +10V calibration, the calibration signal can be +9V to +11V. The rest of the tolerances are expressed as full-scale values.
  • Page 100 Calibration Reference Table B-2 Default calibration constants and tolerances Cal constant Default cal constant Typical name constant tolerance constants Description usr_10vfs +10e+0 1.0000000E+01 +10V value entered by user. usr_m10vfs -10e+0 -1.0000000E+01 -10V value entered by user. usr_100vfs +100e+0 1.0000000E+02 +100V value entered by user (not used). aper_corr_1plc +1.44e-1 1.44e-2...

  • Page 101: Miscellaneous Commands

    Example Send default code of KI002182. :CAL:PROT:CODE 'KI002182' :COUNT? (:CALibration:PROTected:COUNT?) Purpose To request the number of times the Model 2182 has been calibrated. Format :cal:prot:count? Response Number of times calibrated. Description query may be used to determine the total number of times the :COUNT? Model 2182 has been calibrated.

  • Page 102: Lock

    Calibration Reference :LOCK (:CALibration:PROTected:LOCK) Purpose To lock out calibration. Format :cal:prot:lock Query :cal:prot:lock? Response 0 Calibration unlocked 1 Calibration locked Description command allows you to lock out calibration after completing :LOCK those procedures. Thus, performs the opposite of sending the code :LOCK with the command.

  • Page 103: Date

    Calibration Reference :DATE (:CALibration:PROTected:DATE) Purpose To program the calibration date. Format :cal:prot:date <year>, <month>, <day> Parameters <year> = 1997 to 2096 <month> = 1 to 12 <day> = 1 to 31 Query :cal:prot:date? Response <year>, <month>, <day> Description command allows you to store the calibration date in instrument :DATE EEROM for future reference.

  • Page 104: Data

    Calibration Reference :DATA? (:CALibration:PROTected:DATA?) Purpose To request the calibration constants for the active range. Format :cal:prot:data? Response Comma-separated ASCII floating-point constants Description query requests the calibration constants for the :CAL:PROT:DATA? active range. The returned constants are in ASCII floating-point format delimited by commas.

  • Page 105: Precalibration Commands

    B-10 Calibration Reference Precalibration commands :PCAL :CALibrate:PROTected:PCAL:STEPn NOTE Precal :STEP commands are intended to be one-time manufacturing calibration steps, and are only allowed if the STEP key was held in at power-up. Purpose To perform various precal steps. Format :cal:prot:pcal:stepn Parameters Table B-4.

  • Page 106: Detecting Calibration Errors

    Several methods to detect calibration errors are discussed below. Reading the error queue As with other Model 2182 errors, any calibration errors will be reported in the error queue. (You can read the error queue by using the :SYST:ERR? query.)

  • Page 107: Status Byte Eav (Error Available) Bit

    B-12 Calibration Reference Table B-5 Calibration errors (cont.) Error number Error message +430 "Precal selection error" +431 "Precal offset DAC zero error" +432 "ACAL Temperature error" +438 "Date of calibration not set" +439 "Next date of calibration not set" +440 "Gain-aperture correction error"...

  • Page 108: Detecting Calibration Step Completion

    After sending *OPC, use the serial poll (SPE, SPD) sequence to monitor the RQS bit of the serial poll (status) byte of the Model 2182. When the calibration step is completed, a service request will be generated and set the RQS bit, indicating that the next calibration step can now be performed.
  • Page 109 B-14 Calibration Reference...

  • Page 110: Calibration Program

    Calibration Program Calibration Program...

  • Page 111: Introduction

    The following computer hardware is required to run the calibration programs: • IBM PC compatible computer. • Keithley KPC-488.2, KPS-488.2, or KPC-488.2AT, or CEC PC-488 IEEE-488 interface for the computer. • Two shielded IEEE-488 connecting cables (Keithley Model 7007). Software requirements In order to use the calibration programs, you will need the following computer software: •...

  • Page 112: General Program Instructions

    Be sure to use shielded IEEE-488 cables for bus connections. Turn on the computer, the Model 2182, and the calibrator. Allow the Model 2182 and the multimeter to warm up for at least 2-1/2 hours before performing calibration.
  • Page 113 PRINT #1, "OUTPUT 4;"; Msg$ PRINT #1, "OUTPUT 4;OPER" END SELECT IF I > 2 THEN GOSUB Settle PRINT #1, "OUTPUT 7;"; C$; Cmd$; ";*OPC" ' Send cal command to 2182. GOSUB CalEnd ' Wait until cal step ends. GOSUB ErrCheck ' Check for cal error.
  • Page 114 Calibration Program ErrCheck: ' Error check routine. PRINT #1, "OUTPUT 7;:SYST:ERR?" ' Query error queue. PRINT #1, "ENTER 7" INPUT #2, E, Err$ IF E <> 0 THEN BEEP: PRINT Err$: GOTO ErrCheck ' Display error. RETURN Settle: ' Calibrator settling routine. DO: PRINT #1, "OUTPUT 4;ISR?"...
  • Page 115 Calibration Program...
  • Page 116 Index Digital circuitry Disassembly 5-1, 5-4 DISP test Display board CODE Display board checks 4-10 COUNT? DATE Environmental conditions 1-2, 2-2 LOCK Error summary B-11 NDUE PCAL B-10 SAVE Factory calibration 2-12 Factory service Front panel calibration Aborting calibration Front panel disassembly Analog circuit checks 4-13 Front panel tests...
  • Page 117 Parts lists Software requirements Performance Verification Solder repairs Performing the verification test procedures Specifications Power module connections Static sensitive devices Power module removal Status byte EAV (Error Available) bit B-12 Power supply Power supply checks 4-11 Power transformer removal Temperature and relative humidity Power-on self-test Temperature measurement accuracy Precalibration commands...
  • Page 118 Service Form Model No. Serial No. Date Name and Telephone No. Company List all control settings, describe problem and check boxes that apply to problem. ❏ ❏ ❏ Intermittent Analog output follows display Particular range or function bad; specify ❏ ❏...
  • Page 120 M E A S U R E C O N F I D E N C E Keithley Instruments, Inc. Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY • www.keithley.com 12/06...

This manual is also suitable for:

2182a

Table of Contents