Calibrator
Mainframe Calibration
51
4. Start the ac current calibration procedure and push the softkey labeled SKIP
STEP to go to the step(s) that use the newly characterized shunt.
5. Put the Product in OPERATE and measure the ac voltage across the shunt.
6. Calculate the ac current from the data derived from the dc characterization
and the ac correction factors supplied by the shunt manufacturer.
7. Type in the ac current value in the Product.
8. Continue the calibration until Table 36 is complete.
There are important remote commands used in this procedure.
• CAL_START MAIN, AI Start the ac current calibration procedure.
• CAL_SKIP Skip to the applicable calibration step.
• CAL_ABORT Used to exit calibration between steps.
• CAL_NEXT Do the subsequent calibration step.
• CAL_STORE Store the new calibration constants
Because of the complexity of this procedure, it is recommended that the
calibration steps be automated. See Figure 14 for a MET/CAL code fragment that
demonstrates how the code can be written. Figure 14 is an example only to be
used for a demonstration.
The equipment shown in Table 36 is necessary to do the calibration steps in
Table 37 for the ac current function.
Table 36. Test Equipment Required for AC Current Calibration
Quantity Manufacturer Model Equipment
1 Fluke PN 900394
Type N to dual banana
adapter
1 Fluke 5790A or 5790B 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 792-7004 A40 Current Shunt, Adapter
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