321 Calibration Adjustment - Fluke 321 Calibration Information Manual

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Calibration Information

321 Calibration Adjustment

Use the following steps to adjust the calibration of the 321 (refer to Figure 4):
1. Remove the screws on the bottom of the Meter.
2. Lift off the top case.
3. Apply 600.0 V 50 Hz from the 5520A.
4. Adjust VR1 until display reads within 1.0 V.
5. Apply 4 A 50 Hz from the 5520A to the 50-turn coil. The 50-turn coil will make the meter read 200.0
A 50 Hz .
6. Adjust VR2 until the display reads within 0.5 A. A mirror will need to be used because the calibration
point cannot be seen from the top side of the meter.
7. Replace the top case.
8. Replace the case screws.
9. Verify the calibration by going through the performance test procedures.
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