322 Calibration Adjustment - Fluke 321 Calibration Information Manual

32x
Calibration Information

322 Calibration Adjustment

Use the following steps to adjust the calibration of the meter (refer to Figure 5):
1. Turn the meter to DC V.
2. Remove the screws on the bottom of the Meter.
3. Lift off the top case.
4. Apply 300.0 V DC from the 5520A to the Meter..
5. Adjust VR1 until the UUT (Unit Under Test) display reads within 0.1 V.
6. Change the meter to the V AC function.
7. Apply 300 V @ 60 Hz.
8. Adjust VR2 until the UUT display reads within 0.1. V.
9. Change to the A AC function.
10. Apply 6 A 60 Hz to the 50-turn coil. The 50-turn coil will cause the Meter read this as 300.0 A 60Hz.
11. Adjust VR3 until this difference between steps 8 and 11 is within 0.1 A. A mirror will need to be used
because the calibration point cannot be seen from the top side of the meter.
12. Replace top case.
13. Verify the calibration by going through the Performance Test procedures.
12