Service manual

Calibration and Verification
Performance Verification 3
3-41
6. On the calibrator select the value required for verification in the negative polarity.
7. Note the Multimeter’s reading. Compare the result with the allowable tolerance,
taking into account any known error from nominal of the calibrator for this output.
Table 3-11. DC Current Verification Points and Sequence
8508A Range Current Tolerance
[1]
0 μA Perform input zero operation to calibrator range locked zero output
+100μA ± 0.00190 μA
200 μA
-100μA ± 0.00190 μA
0 mA Perform input zero operation to calibrator range locked zero output
+1mA ± 0.0000190 mA
2 mA
-1mA ± 0.0000190 mA
0 mA Perform input zero operation to calibrator range locked zero output
+10mA ± 0.000200 mA
20 mA
-10mA ± 0.000200 mA
0 mA Perform input zero operation to calibrator range locked zero output
+100mA ± 0.00530 mA
200 mA
-100mA ± 0.00530 mA
0 A Perform input zero operation to calibrator range locked zero output
+1A ± 0.0002260 A
2 A
-1A ± 0.0002260 A
0 A Perform input zero operation to calibrator range locked zero output
+10A ± 0.004950 A
20 A
-10A ± 0.004950 A
[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.
AC Current 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
ACI key
4. Press the
CONFIG key. Select RESL6 and 100Hz Filter.
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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