5080A
Service Manual
48
DC Current Calibration
The equipment shown in Table 34 is necessary for calibration of the dc current
function. (The equipment is also listed in the consolidated table, Table 29.)
You must use the calibrated dc current function of the Product later to prepare for
ac calibration. Because of this, you must save the dc current constants after dc
current calibration and exit calibration, then resume calibration. The dc current
calibration procedure shows how to save, exit, and resume calibration.
Table 34. Test Equipment Required for DC Current Calibration
Quantity Manufacturer Model Equipment
1 Fluke 8508A DMM
1 Fluke 742A-1k Resistance Standard, 1 kΩ
1 Fluke 742A-100 Resistance Standard, 100 Ω
1 Fluke 742A-10 Resistance Standard, 10 Ω
1 Fluke 742A-1 Resistance Standard, 1 Ω
1 Guildline 9230 0.01 Ω shunt
To calibrate the dc current function:
1. Make sure to zero each range before each DMM measurement.
2. Make sure the UUT is in standby.
3. Set the DMM to the dc voltage function.
4. Connect the DMM and 742A-1k Resistance Standard to the UUT as shown in
Figure 12.
5. On the first dc current calibration point in Table 35, wait for the output to
settle, record the DMM voltage measurement, and compute the UUT current
output with the certified resistance value of the 742A.
6. Type in the computed value into the UUT.
7. Go to the subsequent calibration point, make sure that the UUT is in standby,
and disconnect the 742A.
8. Redo steps 3 through 6 above with the resistance standard or current shunt
specified for each calibration point in Table 35.
9. Exit calibration and save the calibration constants changed so far through the
front panel menus or the CAL_STORE remote command.
Table 35. Calibration Steps for DC Current
Step 5080A Output (AUX, HI, LO) Shunt to Use
1 300.000 μA Fluke 742A-1k 1 kΩ Resistance Standard
2 3.00000 mA Fluke 742A-100 100 Ω Resistance Standard
3 30.000 mA Fluke 742A-10 10 Ω Resistance Standard
4 300.000 mA Fluke 742A-1 1 Ω Resistance Standard
5 1.9000 A Guildline 9230 0.01 Ω shunt
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