Service manual

Calibration and Verification
Performance Verification 3
3-43
Frequency Checks
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
ACV key, select the 2V range
4. Press the
CONFIG key. Select Tfer On, Filt 40Hz.
5. Confirm that the 8508A is configured for internal guard (External Guard is
deselected) by checking that the
Ext Grd legend does not appear on the left-hand
display.
Procedure
1. On the 8508A press
MONITOR and then CONFIG. Deselect FREQ GATE Fast.
2. Press the
MONITOR key and select FREQ.
3. On the calibrator set the output to the voltage to 1V and frequency to 1MHz. Set the
output to
OPERATE.
4. Note the Multimeter’s frequency reading. Check the result is within ±0.000012MHz,
taking into account any known error from nominal of the calibrator output frequency
for this point.
5. Set the calibrator output to
STANDBY.
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