DCM330 Adjustment Procedures
14
Handheld and Benchtop Instruments Basic Service
3. Adjust VR2 until the display reads 00.0 ± 5 counts.
4. Remove the short.
5. Press the clamp meter DCA AUTO ZERO button to zero the display.
6. Adjust VR3 until the display reads 00.0.
To adjust the DC 400 A range calibration, perform the following steps.
1. Set the clamp meter to the DC position.
2. Select the appropriate coil to multiply the output of DC current calibrator to
200 A.
3. Position the clamp around the coil of the DC current calibrator and release
the clamp trigger. Ensure that the clamp is entirely closed.
4. Position the clamp to the center of the coil.
5. Adjust VR5 until the display reads 201.5.
6. Remove the clamp meter from the coil.
To adjust the DC 1000 A range calibration, perform the following steps.
1. Set the clamp meter to the DC position.
2. Select the appropriate coil to multiply the output of the DC current calibrator
to 400 A.
3. Position the clamp around the coil of the DC current calibrator and release
the clamp trigger. Ensure that the clamp is entirely closed.
4. Press the clamp meter DCA AUTO ZERO button to zero the display.
5. Position the clamp to the center of the coil.
6. Adjust VR6 until the display reads 400.
7. Remove the clamp meter from the coil.
To adjust the AC 400 A range calibration, perform the following steps.
1. Set the clamp meter to the AC position.
2. Select the appropriate coil to multiply the output of the AC current calibrator
to 390 A at 400 Hz.
3. Position the clamp around the coil of the DC current calibrator and release
the clamp trigger. Ensure that the clamp is entirely closed.
DC 400 A Range
DC 1000 A Range
AC 400 A Range