Keithley Instruments, Inc. warrants this product to be free from defects in material . aspects of Nanovoltmeter operation, refer to the Model User’s Manual. A. Nanovoltmeter. Accessories Supplied. Low Thermal Input Cable with spade lugs, m (4 ft). User manual, service manual, contact cleaner. View and Download Keithley user manual online. Nanovoltmeter. Measuring Instruments pdf manual download. Also for: a.

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During the warranty period, Keithley Instruments will, at its option, either repair or replace any product that proves to be defective. References to the Model also apply to the Model A. First Printing, July Document Number: Revision A Document Number A July All Keithley mnual names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand names are trademarks or registered trademarks of their respective holders.

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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. If you are mannual about the applicability of a replacement component, call a Keithley Instruments office for information. Table of Contents Performance Verification Introduction Performing the verification test procedures Specifications Calibration Reference Introduction Default calibration constants and tolerances Figure Connections for 10mV range accuracy Figure Connections for temperature accuracy verification Figure Connections for analog output accuracy Table Input cable color ,eithley Table DC voltage measurement accuracy limits Table Temperature measurement accuracy limits Replaceable Parts Table Motherboard parts list Table Motherboard parts list continued Table Display board parts list You can perform these verification procedures: Line power The Model requires a nominal line voltage of,or V and a line frequency of 50 to 60Hz or Hz.

Verification tests must be performed with the correct line voltage. If necessary, change the line voltage setting as covered in Performance Verification Verification reading limits The verification limits stated in this section have been calculated using only the Model 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 specifications and corresponding test equipment specifications.

Be sure to restore factory front panel defaults, and perform a full auto-calibration ACALas outlined above. The test involves applying precise DC voltages and then verifying that the Model voltage readings are within required limits. Set the DC calibrator output voltage to the indicated value. Repeat step 7 for negative source voltages with the same magnitudes as those listed in Table However, the following procedure is provided for those who wish to independently measure temperature measurement accuracy.


Be sure that DC voltage measurement accuracy is within required limits before attempting this procedure. Also enable REL on the digital multimeter. keihley

Verify analog output accuracy for each of the voltages listed in Table For each test point: Line Power The Model requires a nominal line voltage of,or V and a line frequency of 50 to 60Hz or Hz.

Calibration must be performed with the correct line voltage. Calibration Calibration dates Choose the DATES selection in the calibration menu to display the date the Model was calibrated and the date calibration is due. The unit will display these dates as in the examples below: Query the instrument for the type of error by using the: The Model will respond with the error number and a text message describing the nature of the error.

See Appendix B for details. The calibration procedures described below are generally the only instrument calibration required in the field. If, however, the Model has been repaired, the factory calibration procedures described in Factory calibration at the end of this section should be performed instead. Start the calibration process as follows: After the front panel short and open procedure, the unit will prompt you for the first DC voltage: Press ENTER to continue, and the Model will prompt you to enter the calibration date and the calibration due date.

Set these dates as follows: Select the DCV1 function. Make sure the primary address of the Model 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: SeeTable for wire colors. Allow two minutes for thermal equilibrium. RS port using a straight-through 9-pin to 9-pin cable use a pin keitlhey if necessary. Wait two minutes to keithlry for thermal equilibrium before proceeding.

See Table for Model cable connections.


Set the calibrator to output DC volts, and turn external sense off. Wait at least three minutes before proceeding to allow for thermal equilibrium. Send the following command: Send the following command to calibrate the analog output: Calibration Saving calibration constants After completing the calibration procedure, send the following command to save the new calibration constants: SAVE command is sent.

Calibration constants can be returned using the: The power line fuse is accessible from the rear panel, just adjacent to the AC power receptacle in the power module see Figure You can change the line voltage as follows: Carefully pry the locking tab that secures the fuse carrier to the power module.


Troubleshooting Introduction This section of the manual will assist you in troubleshooting and repairing the Model 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 If one of these tests fails, the instrument will lock up. Front panel tests There are two front panel tests: Troubleshooting Principles of manuql 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 — Power supply block diagram Figure — Digital circuitry block diagram Figure — Majual 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.

Troubleshooting Microcontroller U is the display board microcontroller that controls the display and interprets key data. Display data is serially transmitted to the microcontroller from the digital section via the TXB line to the microcontroller RDI terminal.

RAMs U and U provide temporary operating storage. Signal paths There are two basic signal paths: Troubleshooting Power supply checks Power supply problems can be checked out using Table Check power module position. Line power Plugged into live Check for correct power-up All signals referenced to digital common.

Troubleshooting Analog circuit checks 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. See Figure Section 1 for DC voltage input test connection. Table Analog circuit checks Step Table Signal multiplexing gain switching U Q Q Q mV 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. Disassembly Introduction This section explains how to handle, clean, and disassemble the Model

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