8508A
Users Manual
AC Current Checks
Equipment Configuration
1. Ensure that the calibrator output is set to
STANDBY and configured for Internal
Guard (
EX GRD is deselected).
2. Connect the equipment as described for Routine Adjustment.
3. Press the
ACI key
4. Confirm that the 8508A is configured for internal guard (External Guard is
deselected) by checking that the
ExGd legend does not appear on the left-hand
display.
Procedure
Repeat the following sequence for each range, starting with the 200µA range and
working up to the 20A range, as listed in Table 6-12.
1. Select the required 8508A range.
2. On the calibrator set the output to the current and frequency for the point being
verified as listed in Table 6-12. Set the output to
OPERATE.
3. Note the 8508A reading. Compare the result with the allowable tolerance, taking into
account any known error from nominal of the calibrator for this output.
4. Repeat steps 2 – 4 for each point to be verified on the 8508A range to be verified.
5. Set the calibrator output to
STANDBY.
6-48
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