Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 6517 6517A_910_01A

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                                             Procedure to Properly Zero the Model 6517A
Keithley Instruments, Inc.
28775 Aurora Road                                                           Release Notes
Cleveland, Ohio 44139
(440) 248-0400
www.keithley.com




Introduction
The following is the recommended procedure for completely zeroing the Model 6517A.
Applies to: Model 6517A Electrometer User's Manual and Getting Started Manual. Substitute the following para-
graphs for those in the 6517A User's Manual and the Getting Started Manual.


2.13.3 Zero correct
The Z-CHK and REL keys work together to cancel (zero correct) any internal offsets that might upset accuracy for
volts and amps measurements.
Perform the following steps to zero correct the volts or amps function:
    1.   Select the V or I function.
    2.   Press Z-CHK to enable Zero Check.
    3.   Select the range that will be used for the measurement.
    4.   Press REL to zero correct the instrument (REL indicator will be lit and "Zcor" displayed).

         NOTE     For the volts function, the "Zcor" message will not be displayed if guard was already
                  enabled ("Grd" displayed).

    5.   Press Z-CHK to disable zero check.
    6.   Readings can now be taken in the normal manner.
Note that the instrument will remain zeroed even if the instrument is upranged. If downranged, re-zero the instrument.
To disable zero correct, press REL with zero check enabled.



2.13.4 "Properly zeroed" (as defined for instrument specifications)
For taking measurements "when properly zeroed", per instrument specifications:
    1.   Perform the zero correct procedure described in section 2.13.3.
    2.   Provide a zero input from a calibration source, or short leads in V function, open leads in I function.
    3.   Press REL to null remaining measurement offsets.
    4.   Readings can now be taken in the normal manner. (REL indicator will remain on.)

         NOTE     Repeat steps 1-4 whenever the measurement range is changed.

To disable REL mode, press REL with zero check not enabled.

         NOTE     These release notes are issued with C03 but are valid for all versions of firmware.


                                                                                        6517A-910-01 Rev. A / 9-02

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