Fluke 5520A Service Manual page 71

3. Perform a dc characterization of the shunt at the amplitude specified in the table (as
demonstrated above).
4. Restart the ac current calibration procedure and using the blue softkeys, perform the
SKIP STEP command to reach the step(s) requiring the newly characterized shunt.
5. Place the 5520A in OPERATE and measure the ac voltage across the shunt.
6. Using the data derived during the dc characterization and the ac correction factors
supplied for the shunt by the manufacturer, calculate the ac current and enter this
value into the calibrator.
7. Continue this process until Table 3-11 is complete.
Following are some important remote commands used in this procedure:
CAL_START MAIN, AI
CAL_SKIP
CAL_ABORT
CAL_NEXT
CAL_STORE
Because of the complexity of this procedure, it is highly recommended that the process
be automated. See Figure 3-9 for a MET/CAL code fragment that demonstrates an
automated approach.
The equipment listed in Table 3-10 is required for calibration of the ac current function.
(The equipment is also listed in the consolidated table, Table 3-1.) Refer to Figure 3-8 for
the proper connections.
Table 3-10. Test Equipment Required for Calibrating AC Current
Quan. Manufacturer
1 Fluke
1 Fluke
1 Fluke
1 Fluke
1 Fluke
1 Fluke
1 Fluke
1 Fluke
Start the ac current calibration procedure.
Skip to the appropriate calibration step.
Used to exit calibration between steps.
Perform the next calibration step.
Store the new calibration constants
Model
5500A/LEADS
PN 900394
5790A
A40-10 mA
A40-200 mA
A40-2A
A40A-20A
792A-7004
Calibration and Verification
Equipment
Test lead set
Type N to dual banana adapter
AC Measurement Standard
Current Shunt, 10 mA
Current Shunt, 200 mA
Current Shunt, 2 A
Current Shunt, 20 A
A40 Current Shunt Adapter
3
Calibration
3-15