Model 6517B Electrometer Reference Manual Section 5: Measurement options
6517B-901-01 Rev. C / August 2015 5-21
Multiple display of REL
One of the "multiple displays" allows you to view the reading without REL applied on the bottom line
of the display and the REL’d reading on the top line. The display is available by repeatedly pressing
either the PREV or NEXT DISPLAY key to scroll through the multiple displays of the particular
function. The following is a typical message for a REL multiple display:
+000.012 mA
Actual = +001.012 (without REL)
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 for the measurement.
4. Press REL to zero correct the instrument (REL indicator is lit and "Zcor" displayed). Note that for
the volts function, the "Zcor" message is not 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 remains zeroed even if the instrument is upranged. If downranged, press
REL to zero the instrument again.
To disable zero correct, press REL with zero check enabled.
Specification considerations
For taking measurements "when properly zeroed", per instrument specifications:
1. Perform the zero correct procedure described above.
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 remains on.)
Repeat steps 1 through 4 whenever the measurement range is changed. To disable REL mode,
press REL with zero check not enabled.
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