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Tektronix KEITHLEY 2182 Service Manual
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Tektronix KEITHLEY 2182 Service Manual

Nanovoltmeter
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Model 2182 and 2182A
Nanovoltmeter
Service Manual
2182A-902-01 Rev. B July 2022
*P2182A-902-01B*
2182A-902-01B
tek.com/keithley

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Summary of Contents for Tektronix KEITHLEY 2182

  • Page 1 tek.com/keithley Model 2182 and 2182A Nanovoltmeter Service Manual 2182A-902-01 Rev. B July 2022 *P2182A-902-01B* 2182A-902-01B...
  • Page 2 Model 2182 and 2182A Nanovoltmeter Service Manual...
  • Page 3 © 2022, Keithley Instruments, LLC Cleveland, Ohio, U.S.A. All rights reserved. Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part, without the prior written approval of Keithley Instruments, LLC, is strictly prohibited. These are the original instructions in English. All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments, LLC.

  • Page 4: Safety Precautions

    Safety precautions The following safety precautions should be observed before using this product and any associated instrumentation. Although some instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury.
  • Page 5 For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be impaired. Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.

  • Page 6: Table Of Contents

    Table of contents Introduction ....................... 1-1 Welcome ..........................1-1 Introduction to this manual ....................1-2 Extended warranty ....................... 1-2 Contact information ......................1-2 General ratings ........................1-2 Performance verification ..................2-1 Introduction .......................... 2-1 Verification test requirements ....................2-2 Environmental conditions ..................... 2-2 Warmup period ........................
  • Page 7 Table of contents Model 2182 and 2182A Nanovoltmeter Service Manual Front-panel error reporting ......................3-5 Remote error reporting ......................3-6 Aborting calibration ......................3-6 Normal calibration ........................ 3-6 Recommended calibration equipment ................. 3-6 Front panel calibration......................3-7 Preparing the 2182A for calibration ................... 3-7 Front panel short and open calibration ..................
  • Page 8 Model 2182 and 2182A Nanovoltmeter Service Manual Table of contents Key matrix ..........................5-6 Digital circuitry ........................5-6 Microprocessor .......................... 5-6 Memory circuits ......................... 5-7 RS-232 interface ........................5-7 IEEE-488 interface ........................5-7 Trigger circuits ........................... 5-7 Analog circuitry ........................5-8 Input signal conditioning ......................
  • Page 9 Table of contents Model 2182 and 2182A Nanovoltmeter Service Manual :CALibration:PROTected:SAVE ....................7-6 :CALibration:PROTected:DATE ....................7-7 :CALibration:PROTected:NDUE ....................7-8 :CALibration:PROTected:DATA? ....................7-8 Calibration step commands ....................7-9 :CALibrate:PROTected:DC:STEP<n> ..................7-9 Precalibration commands....................7-10 :CALibrate:PROTected:PCAL:STEP<n> ................. 7-10 :CALibrate:PROTected:PCAL:DATA? ..................7-11 Detecting calibration errors ....................7-11 Reading the error queue ......................

  • Page 10: In This Section

    Section 1 Introduction In this section: Welcome ...................1-1 Introduction to this manual ............1-2 Extended warranty ..............1-2 Contact information ..............1-2 General ratings .................1-2 Welcome The two-channel Model 2182A Nanovoltmeter is optimized for making stable, low-noise voltage measurements and for characterizing low resistance materials and devices reliably and repeatably. Features of the 2182A Nanovoltmeter include: •...

  • Page 11: Introduction To This Manual

    If you have any questions after you review the information in this documentation, please contact your local Keithley Instruments office, sales partner, or distributor. You can also call the Tektronix corporate headquarters (toll-free inside the U.S. and Canada only) at 1-800-833-9200. For worldwide contact numbers, visit tek.com/en/contact-tek.

  • Page 12: Performance Verification

    Section 2 Performance verification In this section: Introduction ................2-1 Verification test requirements ............2-2 Environmental conditions ............2-2 Warmup period .................2-2 Line power ................2-2 Recommended verification equipment ........2-3 Verification reading limits ............2-3 Restoring factory defaults ............2-4 Autocalibration (ACAL) .............2-5 Performing the verification test procedures .......2-5 Introduction Use the procedures in this section to verify that 2182A accuracy is within the limits stated in the instrument’s one-year accuracy specifications.

  • Page 13: Verification Test Requirements

    Section 2: Performance verification Model 2182 and 2182A Nanovoltmeter Service Manual Verification test requirements Be sure that you perform the verification tests: • Under the proper environmental conditions. • After the specified warmup period. • Using the correct line voltage. •...

  • Page 14: Recommended Verification Equipment

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 2: Performance verification Recommended verification equipment The following table summarizes recommended verification equipment. You can use alternate equipment if that equipment has specifications at least four times better than corresponding 2182A specifications. Test equipment accuracy adds to the uncertainty of each measurement. Recommended verification equipment Description Manufacturer/Model...

  • Page 15: Example Limits Calculation

    Section 2: Performance verification Model 2182 and 2182A Nanovoltmeter Service Manual Example limits calculation As an example of how verification limits are calculated, assume you are testing the 10 V dc voltage range using a 10 V input value. Using the 2182A 10 V range one-year accuracy specification of ±(25 ppm of reading + 2 ppm of range), the calculated reading limits are: Reading limits = 10 V ±...

  • Page 16: Autocalibration (Acal)

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 2: Performance verification Autocalibration (ACAL) Before verifying accuracy, perform an autocalibration to ensure the instrument meets its specifications. Autocalibration takes several minutes to complete. Do not perform full autocalibration with a test voltage connected to the input jack. Test voltage connected to the input jack may cause instrument damage.

  • Page 17: Test Considerations

    Section 2: Performance verification Model 2182 and 2182A Nanovoltmeter Service Manual Test considerations When performing the verification procedures: • Be sure to restore factory front panel defaults, and perform a full auto-calibration (ACAL), as outlined above. • Make sure that the 2182A and test equipment are properly warmed up, and that the test equipment is connected to the appropriate 2182A jacks.
  • Page 18 Model 2182 and 2182A Nanovoltmeter Service Manual Section 2: Performance verification 100 mV to 100 V range accuracy To verify the voltage measurement accuracy for the 100 mV to 100 V ranges: 1. With the power off, connect the DC calibrator to CHANNEL 1 of the 2182A input jack, as shown in the following figure.
  • Page 19 Section 2: Performance verification Model 2182 and 2182A Nanovoltmeter Service Manual 10 mV range accuracy To verify the voltage measurement accuracy for the 10 mV range: 1. With the power off, connect the DC calibrator and low-thermal divider to the 2182A CHANNEL 1 terminals of the input jack, as shown in the following figure.

  • Page 20: Temperature Measurement Accuracy

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 2: Performance verification Temperature measurement accuracy This procedure involves applying thermocouple voltages from a temperature calibrator and then verifying that 2182A temperature measurements are within required limits. If the 2182A meets its dc volts accuracy specifications, temperature accuracy is automatically guaranteed, and it is not necessary to verify temperature measurement accuracy.

  • Page 21: Analog Output Accuracy

    Section 2: Performance verification Model 2182 and 2182A Nanovoltmeter Service Manual 5. Verify temperature measurement accuracy for each of the temperature settings listed in the following table. For each measurement:  Set the 2182A for the appropriate thermocouple type.  Set the temperature calibrator to the correct thermocouple type and temperature setting.
  • Page 22 Model 2182 and 2182A Nanovoltmeter Service Manual Section 2: Performance verification Figure 4: Connections for analog output accuracy 2. Select the 2182A DCV1 measurement function and choose the 10 V range. 3. Press SHIFT then AOUT, then use the RANGE and left and right arrow keys to set the following: ...

  • Page 23: Calibration

    Section 3 Calibration In this section: Introduction ................3-1 Environmental conditions ............3-2 Warmup period .................3-2 Line power ................3-2 Calibration considerations ............3-2 Calibration cycle ................3-3 Calibration menu ...............3-3 Calibration errors ..............3-5 Aborting calibration ..............3-6 Normal calibration ..............3-6 Recommended calibration equipment ........3-6 Front panel calibration ..............3-7 Remote calibration ..............3-10 Factory calibration ..............3-14 Recommended test equipment ..........3-14...

  • Page 24: Environmental Conditions

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual Environmental conditions Conduct the calibration procedures at an ambient temperature of 18°C to 28°C (65°F to 82°F) with relative humidity of less than 70% unless otherwise noted. Warmup period Allow the 2182A to warm up for at least 2½ hours before performing calibration. If the instrument has been subjected to temperature extremes (those outside the ranges stated in Environmental conditions (on page 3-2)), allow additional time for the instrument’s internal...

  • Page 25: Calibration Cycle

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration The maximum voltage between any terminals to chassis ground is 350 V . Exceeding this PEAK value may cause a breakdown in insulation, creating a shock hazard that could result in personal injury or death.

  • Page 26: Calibration Count

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual Calibration count Choose the COUNT selection in the calibration menu to display the number of times the instrument was calibrated. The instrument displays the calibration count as in this example: COUNT: 1 Calibration temperature Select TEMP to display the internal temperature of the instrument at the time it was calibrated;...

  • Page 27: Remote Calibration Unlock

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration Remote calibration unlock To unlock calibration using remote communications, send the following command: :CAL:PROT:CODE '<code>' For example, the following command uses the default code: :CAL:PROT:CODE 'KI002182' To change the calibration code, first send the present code, then send the new code. If you change the first two characters of the password to something other than "KI", you will not be able to unlock calibration from the front panel.

  • Page 28: Remote Error Reporting

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual Remote error reporting You can detect errors while in remote by testing the state of EAV (Error Available) bit (bit 2) in the status byte. Use the *STB? query to request the status byte. Query the instrument for the type of error by using the :SYST:ERR? query.

  • Page 29: Front Panel Calibration

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration Front panel calibration The procedures for front panel calibration include: • Preparing the 2182A for calibration • Front panel short and open calibration • DC volts calibration • Setting calibration dates and saving calibration •...

  • Page 30: Dc Volts Calibration

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual Figure 5: Low-thermal short connections 3. Press ENTER to start short-circuit calibration. While the instrument is calibrating, it will display: CALIBRATING 4. When the instrument is done calibrating, it displays the following prompt: REMOVE INPUT 5.
  • Page 31 Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration The Model 2107 cable connections are summarized in the following table. Input cable color codes Input connection Wire color Channel 1 HI Channel 1 LO Black Channel 2 HI Green Channel 2 LO White 3.

  • Page 32: Setting Dates And Saving Calibration

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual Setting dates and saving calibration At the end of the calibration procedure, the instrument displays the CALIBRATION COMPLETE message. Press ENTER to continue. The 2182A prompts you to enter the calibration date and the calibration due date.

  • Page 33: Preparing The 2182A For Calibration

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration Preparing the 2182A for calibration To prepare the 2182A for remote calibration: 1. Connect the 2182A to the IEEE-488 bus of the computer using a shielded IEEE-488 cable, such as the Keithley Model 7007, or connect the instrument to a computer through the RS-232 port using a straight-through 9-pin to 9-pin cable (use a 9 to 25-pin adapter if necessary).

  • Page 34: Dc Volts Calibration

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual 3. Send the following command: :CAL:PROT:DC:STEP1 4. After the 2182A completes this step, remove the low-thermal short. 5. Send this command: :CAL:PROT:DC:STEP2 DC volts calibration To perform the dc volts calibration: 1.

  • Page 35: Programming Calibration Dates

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration For each step:  Set the calibrator to the indicated voltage and make sure the instrument is in operate. (Use the recommended voltage whenever possible.)  Allow the signal voltage to settle. ...

  • Page 36: Factory Calibration

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual Factory calibration The following calibration procedures are normally performed only at the factory, but the necessary steps are included here in case the instrument is repaired (such as changing internal components) and the instrument requires these calibration procedures.

  • Page 37: Preparing The 2182A For Factory Calibration

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration Preparing the 2182A for factory calibration To prepare the 2182A for remote calibration: 1. Connect the 2182A to the IEEE-488 bus of the computer using a shielded IEEE-488 cable, such as the Keithley Model 7007, or connect the instrument to a computer through the RS-232 port using a straight-through 9-pin to 9-pin cable (use a 9 to 25-pin adapter if necessary).

  • Page 38: Short And Open Calibration

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual The Model 2107 cable connections are summarized in the following table. Input cable color codes Input connection Wire color Channel 1 HI Channel 1 LO Black Channel 2 HI Green Channel 2 LO White 2.

  • Page 39: Dc Volts Calibration

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration 2. Send the following command: :CAL:PROT:DC:STEP1 3. After the 2182A completes this step, remove the low-thermal short, and send this command: :CAL:PROT:DC:STEP2 DC volts calibration After front panel short and open steps, do the following: 1.

  • Page 40: Analog Output Calibration

    Section 3: Calibration Model 2182 and 2182A Nanovoltmeter Service Manual Analog output calibration To perform analog output calibration: 1. Connect the 2182A analog output to CHANNEL 1 of the front-panel input jack, as shown in the following figure. Figure 12: Connections for analog output calibration 2.

  • Page 41: Saving Calibration Constants

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 3: Calibration Saving calibration constants After completing the calibration procedure, you must save the new calibration constants. Calibration constants are not saved unless the :SAVE command is sent. To save the new calibration constants, send the following command: :CAL:PROT:SAVE Calibration constants can be returned using the :CAL:PROT:DATA? command.

  • Page 42: In This Section

    Section 4 Maintenance In this section: Introduction ................4-1 Line fuse replacement ...............4-1 Line voltage selection ...............4-3 Introduction This section includes information about routine type maintenance that can be performed by the operator. Line fuse replacement A fuse on the 2182A rear panel protects the power line input of the instrument. See the following instructions to replace the fuse.
  • Page 43 Section 4: Maintenance Model 2182 and 2182A Nanovoltmeter Service Manual To replace the line fuse: 1. Power off the instrument. 2. Remove all test leads connected to the instrument. 3. Remove the line cord. 4. Make note of the voltage displayed in the fuse holder assembly window. 5.

  • Page 44: Line Voltage Selection

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 4: Maintenance Line voltage selection Disconnect the line cord at the rear panel and remove all test leads connected to the instrument before changing the line voltage. Failure to do so could expose the operator to hazardous voltages that could result in personal injury or death.

  • Page 45: Troubleshooting

    Section 5 Troubleshooting In this section: Introduction ................5-1 Repair considerations ...............5-2 Power-on self-test ..............5-2 Principles of operation ..............5-4 Power supply ................5-4 Display board ................5-5 Digital circuitry ................5-6 Analog circuitry .................5-8 Troubleshooting ..............5-10 Factory service ................5-14 Introduction This section of the manual will assist you in troubleshooting and repairing the 2182A. Included are self-tests, test procedures, troubleshooting tables, and circuit descriptions.

  • Page 46: Repair Considerations

    Section 5: Troubleshooting Model 2182 and 2182A Nanovoltmeter Service Manual Repair considerations The printed circuit (PC) boards are built using surface mount techniques and require specialized equipment and skills for repair. If you are not equipped or qualified, it is strongly recommended that you send the instrument back to the factory for repairs or limit repairs to PC board replacement.

  • Page 47: Key Test

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 5: Troubleshooting KEY test The KEY test allows you to check the functionality of each front-panel key. To run the KEY test: 1. Press SHIFT and then TEST to access the self-test options. 2.

  • Page 48: Principles Of Operation

    Section 5: Troubleshooting Model 2182 and 2182A Nanovoltmeter Service Manual 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 and schematic diagrams: •...

  • Page 49: Display Board

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 5: 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.

  • Page 50: Microcontroller

    Section 5: Troubleshooting Model 2182 and 2182A Nanovoltmeter Service Manual 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 51: Memory Circuits

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 5: Troubleshooting Memory circuits ROMs U102 and U103 store the firmware code for instrument operation. U102 stores the D0 to D7 bits of each data word. U103 stores the D8 to D15 bits. RAMs U104 and U105 provide temporary operating storage.

  • Page 52: Analog Circuitry

    Section 5: Troubleshooting Model 2182 and 2182A Nanovoltmeter Service Manual Analog circuitry Refer to the following figure for the discussion of analog circuitry. Figure 16: Simplified schematic of analog circuitry 2182A-902-01 Rev. B July 2022...

  • Page 53: Input Signal Conditioning

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 5: Troubleshooting Input signal conditioning Protection circuits The CH1 HI, CH2 HI, and CH2 LO inputs have protection circuits designed to prevent circuit damage from overvoltage signal conditions. Q666 and Q667 provide protection for CH1 HI. Q661 and Q662 provide similar protection for CH2 HI.

  • Page 54: Troubleshooting

    Section 5: Troubleshooting Model 2182 and 2182A Nanovoltmeter Service Manual Circuit gain The following table summarizes the circuit gain factors for the ranges. Circuit gain factors Range Divider attenuation Preamp gain Multiplexer gain 100 V 100:1 10 V 100 mV X100 10 mV X100...

  • Page 55: Power Supply Checks

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 5: Troubleshooting Power supply checks Power supply problems can be checked out using the following table. Power supply checks Step Item/component Required condition Remarks Line fuse Check continuity. Remove to check. Line voltage 120 V or 240 V as required.

  • Page 56: Analog Circuit Checks

    Section 5: Troubleshooting Model 2182 and 2182A Nanovoltmeter Service Manual Analog circuit checks The following table 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. Refer to Voltage measurement accuracy (on page 2-6) for the dc voltage input test connections.

  • Page 57: Analog Signal Switching States

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 5: Troubleshooting Analog signal switching states The following tables provide the switching states of the various integrated circuits and transistors for the basic measurement functions and ranges. You can use these tables to assist in tracing an analog signal from the channel 1 and channel 2 inputs to the A/D multiplexer.

  • Page 58: No Comm Link Error

    Section 5: Troubleshooting Model 2182 and 2182A Nanovoltmeter Service Manual No comm link error A "No Comm Link" error indicates that the front panel processor has stopped communicating with the main processor, which is on the motherboard. This error indicates that one of the main processor ROMs may require re-seating in its socket.

  • Page 59: In This Section

    Section 6 Disassembly In this section: Introduction ................6-1 Handling and cleaning ..............6-1 Assembly drawings ..............6-3 Disassembly ................6-3 Main CPU firmware replacement ..........6-5 Changing trigger link lines ............6-6 Removing power components ...........6-7 Instrument reassembly ..............6-8 Introduction This section explains how to handle, clean, and disassemble the 2182A. Disassembly drawings are provided at the end of this section.

  • Page 60: Solder Repairs

    Section 6: Disassembly Model 2182 and 2182A Nanovoltmeter Service Manual Solder repairs Observe the following precautions when soldering a circuit board: • Use an OA-based (organic activated) flux. Take care not to spread the flux to other areas of the circuit board.

  • Page 61: Assembly Drawings

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 6: Disassembly Assembly drawings Use the following assembly drawings to assist you as you disassemble and reassemble the 2182A. The drawings are provided at the end of this section. • Front Panel Assembly: 2182-040 •...

  • Page 62: Motherboard Removal

    Section 6: Disassembly Model 2182 and 2182A Nanovoltmeter Service Manual Motherboard removal This procedure assumes that the case cover is already removed as described in Case cover removal (on page 6-3). To remove the motherboard. 1. Remove the IEEE-488, RS-232, and BNC jack fasteners. 2.

  • Page 63: Main Cpu Firmware Replacement

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 6: Disassembly Main CPU firmware replacement 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 64: Changing Trigger Link Lines

    Section 6: Disassembly Model 2182 and 2182A Nanovoltmeter Service Manual Changing trigger link lines The 2182A 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.

  • Page 65: Removing Power Components

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 6: Disassembly Removing power components The following procedures to remove the power transformer and power module require that the case cover and motherboard be removed, as described in Case cover removal (on page 6-3) and Motherboard removal (on page 6-4).

  • Page 66: Instrument Reassembly

    Section 6: Disassembly Model 2182 and 2182A Nanovoltmeter Service Manual 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. 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 72: Calibration Reference

    Section 7 Calibration reference In this section: Introduction ................7-1 Command summary ..............7-2 Default calibration constants and tolerances......7-2 General calibration commands ..........7-4 Calibration step commands............7-9 Precalibration commands............7-10 Detecting calibration errors .............7-11 Detecting calibration step completion ........7-13 Introduction This section contains detailed information on the 2182A remote calibration commands, calibration error messages, and methods to detect the end of each calibration step.

  • Page 73: Command Summary

    Section 7: Calibration reference Model 2182 and 2182A Nanovoltmeter Service Manual Command summary The 2182A calibration commands are summarized in the following table. These commands are covered in detail in the following paragraphs. Remote calibration command summary Command Description :CALibration :PROTected :CODE <name>...
  • Page 74 Model 2182 and 2182A Nanovoltmeter Service Manual Section 7: Calibration reference Default calibration constants and tolerances Default cal Cal constant name constant Typical constants Description constant tolerance usr_10vfs +10e+0 1.0000000E+01 +10 V value entered by user. −10e+0 −1.0000000E+01 −10 V value entered by user. usr_m10vfs usr_100vfs +100e+0...

  • Page 75: General Calibration Commands

    Section 7: Calibration reference Model 2182 and 2182A Nanovoltmeter Service Manual General calibration commands The general calibration commands perform functions such as saving calibration constants, locking out calibration, and programming date parameters. :CALibration:PROTected:CODE This command unlocks calibration so that you can perform the calibration procedures. Type Affected by Where saved...

  • Page 76: Calibration:protected:count

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 7: Calibration reference :CALibration:PROTected:COUNT? To request the number of times the 2182A has been calibrated. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :cal:prot:count? Details Returns the number of times the instrument has been calibrated.

  • Page 77: Calibration:protected:save

    Section 7: Calibration reference Model 2182 and 2182A Nanovoltmeter Service Manual To unlock calibration, send the :CODE command with the appropriate password. Example :CAL:PROT:LOCK Lock out calibration. Also see :CALibration:PROTected:CODE (on page 7-4) :CALibration:PROTected:SAVE Saves calibration constants in EEROM after the calibration procedure. Type Affected by Where saved...

  • Page 78: Calibration:protected:date

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 7: Calibration reference :CALibration:PROTected:DATE Programs the calibration date. Type Affected by Where saved Default value Command and query Not applicable Not applicable Not applicable Usage :cal:prot:date <year>, <month>, <day> :cal:prot:date? <year> 1997 to 2096 <month>...

  • Page 79: Calibration:protected:ndue

    Section 7: Calibration reference Model 2182 and 2182A Nanovoltmeter Service Manual :CALibration:PROTected:NDUE Sends the next calibration due date to the instrument. Type Affected by Where saved Default value Command and query Not applicable Not applicable Not applicable Usage :cal:prot:ndue <year>, <month>, <day> :cal:prot:ndue? <year>...

  • Page 80: Calibration Step Commands

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 7: Calibration reference Example :CAL:PROT:DATA? Request calibration constants. Also see None Calibration step commands :CALibrate:PROTected:DC:STEP<n> Performs calibration steps. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :cal:prot:dc:step<n>...

  • Page 81: Precalibration Commands

    Section 7: Calibration reference Model 2182 and 2182A Nanovoltmeter Service Manual Precalibration commands :CALibrate:PROTected:PCAL:STEP<n> Performs precalibration steps. Type Affected by Where saved Default value Command only Not applicable Not applicable Not applicable Usage :cal:prot:pcal:step<n> <n> See Details Details Precalibration :STEP commands are intended to be one-time manufacturing calibration steps. They are only allowed if the STEP key was held in at power-up.

  • Page 82: Calibrate:protected:pcal:data

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 7: Calibration reference :CALibrate:PROTected:PCAL:DATA? Query precalibration constants. Type Affected by Where saved Default value Query only Not applicable Not applicable Not applicable Usage :CALibrate:PROTected:PCAL:DATA? Details The :CAL:PROT:PCAL:DATA? query requests the precalibration constants. Two values are returned; the Linearity Correction Flag (1 or 0), and the offset DAC value.

  • Page 83: Error Summary

    Section 7: Calibration reference Model 2182 and 2182A Nanovoltmeter Service Manual Error summary The following table summarizes calibration errors. Calibration errors Error number Error message +400 "10m vdc zero error" +401 "1 vdc zero error" +402 "10 vdc zero error" +403 "100 vdc zero error"...

  • Page 84: Generating An Srq On Error

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 7: Calibration reference Generating an SRQ on error To program the instrument to generate an IEEE-488 bus SRQ (Service Request) when an error occurs, send the following command: *SRE 4. This command enables SRQ when the EAV bit is set. You can then read the status byte and error queue as outlined above to check for errors and to determine the exact nature of the error.

  • Page 85: Calibration Program

    Section 8 Calibration program In this section: Introduction ................8-1 Computer hardware requirements ..........8-1 Software requirements ..............8-1 Calibration equipment ...............8-2 General program instructions ............8-2 Calibration program ..............8-3 Introduction This section provides a calibration program written in BASIC to help you to field calibrate the 2182A. Refer to Calibration (on page 3-1) for details on calibration procedures, equipment, and connections.

  • Page 86: Calibration Equipment

    Section 8: Calibration program Model 2182 and 2182A Nanovoltmeter Service Manual Calibration equipment The following calibration equipment is required: • Fluke 5700A calibrator • Low thermal input cable • Low thermal shorting plug Recommended verification equipment (on page 2-3) and Recommended calibration equipment (on page 3-6) for detailed equipment specifications.

  • Page 87: Calibration Program

    Model 2182 and 2182A Nanovoltmeter Service Manual Section 8: Calibration program Calibration program ' 2182A calibration program for use with the Fluke 5700A calibrator. ' Rev. 1.0, 8/20/97 OPEN "IEEE" FOR OUTPUT AS #1 ' Open IEEE-488 output path. OPEN "IEEE" FOR INPUT AS #2 ' Open IEEE-488 input path.
  • Page 88 Section 8: Calibration program Model 2182 and 2182A Nanovoltmeter Service Manual PRINT "Calibration completed." PRINT #1, "OUTPUT 7;:SYST:PRES" KeyCheck: ' Check for key press routine. WHILE INKEY$ <> "": WEND ' Flush keyboard buffer. PRINT : PRINT "Press any key to continue (ESC to abort program)." DO: I$ = INKEY$: LOOP WHILE I$ = ""...
  • Page 89 Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments. All other trademarks and trade names are the property of their respective companies. Keithley Instruments • 28775 Aurora Road • Cleveland, Ohio 44139 • 1-800-833-9200 • tek.com/keithley 04/2022...

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