Calibration and Verification
Calibration
3
3-15
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 Start the ac current calibration procedure.
• CAL_SKIP Skip to the appropriate calibration step.
• CAL_ABORT Used to exit calibration between steps.
• CAL_NEXT Perform the next calibration step.
• CAL_STORE Store the new calibration constants
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 Model Equipment
1 Fluke 5500A/LEADS Test lead set
1 Fluke PN 900394 Type N to dual banana adapter
1 Fluke 5790A AC Measurement Standard
1 Fluke A40-10 mA Current Shunt, 10 mA
1 Fluke A40-200 mA Current Shunt, 200 mA
1 Fluke A40-2A Current Shunt, 2 A
1 Fluke A40A-20A Current Shunt, 20 A
1 Fluke 792A-7004 A40 Current Shunt Adapter
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