Model 6517A Getting Started Manual Measurement Options 2-11
Zero check
With zero check enabled (“ZeroCheck” displayed), the input signal is routed to low
through a high impedance shunt. For volts, amps, and ohms measurements, zero check
should be enabled when connecting or disconnecting input signals. For charge measure-
ments, zero check should be disabled. If left enabled, the charge will dissipate through the
10MΩ shunt.
The Z-CHK key is used to enable and disable zero check.
NOTE To ensure proper operation, always enable zero check before changing functions
(V, I, R, or Q).
Zero correct
The Z-CHK and REL keys work together to cancel (zero correct) any internal offsets that
might upset accuracy for voltage and current measurements.
Perform the following steps to zero correct the volts or amps function:
1. Select the V or I function.
2. Enable Zero Check.
3. Select the range that will be used for the measurement, or select the lowest range.
4. Press REL to zero correct the instrument. The REL indicator turns on and the
“ZCor” message is 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.
NOTES The instrument will remain zeroed even if the instrument is upranged. If down-
ranged, re-zero the instrument.
To disable zero correct, first enable zero check and then press REL.
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