Service manual

Calibration and Verification
Performance Verification 3
3-37
Table 3-9. AC Voltage Verification Points and Sequence (cont)
8508A Range Voltage Frequency 8508A Filter Tolerance
[1]
100 V 20 Hz 10 Hz ± 0.0144 V
100 V 55 Hz 40 Hz ± 0.0119 V
100 V 1 kHz 100 Hz ± 0.0099 V
100 V 3 kHz 100 Hz ± 0.0119 V
100 V 10 kHz 100 Hz ± 0.0119 V
100 V 30 kHz 100 Hz ± 0.0295 V
100 V 60 kHz 100 Hz ± 0.0795 V
200V
100 V 100 kHz 100 Hz ± 0.0795 V
500 V 55 Hz 40 Hz ± 0.088 V
500 V 1 kHz 100 Hz ± 0.088 V
500 V 3 kHz 100 Hz ± 0.088 V
500 V 10 kHz 100 Hz ± 0.088 V
500 V 30 kHz 100 Hz ± 0.223 V
1000 V 1 kHz 100 Hz ± 0.331 V
1000 V
1000 V 30 kHz 100 Hz ± 1.476 V
[1] Based on 365 day Tcal ±1°C 99 %CL Absolute specifications. See comments in Applicable Verification Tolerance section above
regarding the impact of calibration uncertainties and use of other specifications.
Resistance Checks
When verifying the resistance function, each of the resistance modes (NormalΩ, TruΩ,
LoIΩ and HiVΩ) must be individually checked. The following procedure assumes use of
a multifunction calibrator and verifies each resistance mode in turn, range by range. If
individual standard resistors are used it may be more convenient to check all the modes in
turn for each resistance value to avoid connecting the same resistance standard several
times during the calibration sequence. A 1 GΩ standard resistor is used for ranges above
200 MΩ as the highest resistance available from the 5720A calibrator is 100 MΩ.
Equipment Configuration
1. Ensure that the calibrator output is set to
STANDBY and configured for Internal
Guard (
EXT GRD is deselected).
2. Connect the equipment as described for Routine Calibration.
3. Press the
Ω key
4. Press the
CONFIG key. Select Filt, RESL7, and 4WΩ.
5. Confirm that the Multimeter is configured for internal guard (External Guard is
deselected) by checking that the
Ext Grd legend does not appear on the left-hand
display.
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