Operating Procedure; Switching On; Dc Zero Adjustment; Measurement - Chauvin Arnoux PAC 21 Manual De Instrucciones

3/ OPERATING PROCEDURE

3.1/ SWITCHING ON

Set the sliding switch ’ to the appropriate position (range with 1 mV/A or 10 mV/A sensitivity).
Correct operation is indicated by a green light ‘ indicating that the battery is in good condition.
After approximately 10 minutes of operation of the clamp without manipulation of the controls,
the power supply cuts off automatically (see " Auto off " below).
If this green indicator does not come on when the clamp is switched on, or goes out before
it has operated for 10 minutes, it is necessary to replace the battery (see MAINTENANCE
chapter).

3.2/ DC ZERO ADJUSTMENT

Ensure that the jaws of the clamp are correctly closed and that they do not enclose any
conductor. Connect the clamp to your measurement instrument. Press the auto zero button
. The red light  comes on for approximately three seconds to indicate that the instrument
is on zero calibration. If zero can not be obtained, this indicator light remains lit to indicate the
fault.

3.3/ MEASUREMENT

After having switched on the clamp, connected it to the measurement instrument on the
appropriate range, and followed the auto zero procedure (see the two paragraphs above),
enclose the conductor to be measured Πin the jaws of the clamp.
The value is displayed on the measurement instrument.
Depending on the sensitivity selected on the clamp and the range of your measurement
instrument, apply the conversion ratio to get the value of the current.
On DC current measurement, ensure that the arrow located on the external edge
of the jaws corresponds to the direction of the current flowing in the conductor
(source ⇒receiver).

3.4/ OVERLOAD INDICATION

Detection of overload of the range of the clamp is indicated by the red light . This indicator
flashes for a peak current greater than 150 A on the 100 A (10 mV/A) range or 1500 A on the
1000 A (1 mV/A) range.
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