Chauvin Arnoux PAC 25 Notice De Fonctionnement page 40

3. To enter the adjustment mode, hold the DC Zero button down and shift the switch from the OFF
setting to the range to be adjusted (1 mV/A or 10 mV/A). Keep the DC Zero button pressed for
30 seconds, until the ON indicator blinks yellow, then green. Release the DC Zero button. The clamp
is in the adjustment mode.
4. The clamp then performs an adjustment of the zero.
5. Clamp a conductor carrying a current of:
400 Aac 60 Hz for the 1 mV/A range
„
60 Aac 60 Hz for the 10 mV/A range
„
6. Then press the DC Zero button. The first press substantially lowers the polarization adjustment of
Hall effect sensors. Subsequent presses increase this adjustment by one step. So press the DC Zero
button until the correct output voltage is reached.
404 mVrms for the 1 mV/A range.
„
598 mVrms for the 10 mV/A range.
„
If you overshoot this value, continue to press the DC Zero button until the output signal falls below
the desired value, then restart the adjustment.
7. Once this adjustment is done, press the DC Zero button again for 30 seconds, until the ON indicator
blinks yellow, then green. You can then release the DC Zero button. The adjustment is recorded and
the clamp exits from the adjustment mode.
Remarks
„ When the clamp is in the adjustment mode (in other words, from step 3), any change of the switch
setting causes an exit from the adjustment mode with no modification. The clamp will then use the
previous adjustments.
„ To adjust both ranges, you must switch the clamp off, then repeat the adjustment procedure from
step 3.
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