Fluke 5520A - Page 68

5520A
Service Manual
3-12
Table 3-8. Test Equipment Required for Calibrating DC Current
Quan. Manufacturer Model Equipment
1 Fluke 5500A/LEADS Test lead set
1 Hewlett Packard 3458A with -002 option 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
Proceed as follows to calibrate the dc current function:
1. Perform the ACAL ALL and MATH NULL operations on the HP 3458A before you
begin.
2. Verify that the UUT is in standby.
3. Set the DMM to measure dc voltage.
4. Connect the DMM and 742A-1k Resistance Standard to the UUT as shown in
Figure 3-6.
5. On the first dc current calibration point in Table 3-9, wait for the output to settle,
record the DMM voltage reading, and compute the UUT current output using the
certified resistance value of the 742A.
6. Enter the computed value into the UUT.
7. Proceed to the next calibration point, verify that the UUT is in standby, and
disconnect the 742A.
8. Repeat steps 3 through 6 above using the resistance standard or current shunt
specified for each calibration point in Table 3-9.
9. Exit calibration and save the calibration constants modified so far by using the front
panel menus or the CAL_STORE remote command.