Dc Current Checks - Fluke 8508A Service Manual

8508A
Service Manual
8508A Range
20 M
200 M
2 G
20 G
[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.
[2] Ranges require separate input zero operation in each resistance mode.

DC Current Checks

Equipment Configuration
1. Ensure that the calibrator output is set to
2. Connect the equipment as described for Routine Calibration.
3. Press the
4. Press the
5. Confirm that the Multimeter is configured for internal guard (External Guard is
Procedure
Repeat the following sequence for each range, starting with the 200 A range and
working up to the 20A range, as listed in Table 3-11. An input zero operation is
performed on each Multimeter range prior to performing the range verification
measurements with the calibrator set to zero by range locking the calibrator in the range
from which the output will be obtained.
1. Select the required Multimeter range.
2. On the calibrator set the output to zero. Select OPERATE.
3. On the Multimeter press the
4. On the calibrator select the value required for verification in the positive polarity.
5. Note the Multimeter's reading. Compare the result with the allowable tolerance,
3-40
Table 3-10. Resistance Verification Points and Sequence (cont)
Resistance
0 G
10 M
0 G
100 M
0 G
1 G
0 G
1 G
Guard ( is deselected).
EXT GRD
key
DCI
key. Select
CONFIG
deselected) by checking that the
display.
operation.
The legend will appear, and then extinguish when the zero operation has
Busy
completed.
taking into account any known error from nominal of the calibrator for this output.
Tolerance
Perform input zero operation to calibrator range locked zero output
0.0000202 M
Perform input zero operation to calibrator range locked zero output
0.0000870 M
Perform input zero operation to calibrator range locked zero output
0.0003150 G
Perform input zero operation to calibrator range locked zero output
0.012675 G
STANDBY
and .
Filt RESL7
legend does not appear on the left-hand
Ext Grd
key, and select
INPUT Zero Rng
1
2
HiV
and configured for Internal
to initiate the zeroing