Procedure - Chauvin Arnoux E3N Mode D'emploi

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„ To make a current measurement, switch the clamp on by selecting the 100mV/A range. Check that
the ON battery indicator (green) is lit and that the OL indicator is off.
„ Connect the clamp to the oscilloscope. With the clamp closed and not on a conductor, select the
highest sensitivity (for example 1mV/cm) on the oscilloscope and 100mV/A on the clamp, then use the
thumbwheel to adjust the zero of the clamp with respect to a reference chosen on the oscilloscope.
The zero of the oscilloscope is used to refine this adjustment.
„ Select the measurement sensitivities of the clamp and of the oscilloscope.
„ Choose the coupling best suited to the measurement on the oscilloscope.
„ Identify the direction of the primary current using the arrow marked on the top and bottom of the housing.
„ Insert the conductor carrying the current to be measured in the clamp and make the measurement.
Keep the cable or bar correctly centred in the clamp and the clamp quite perpendicular to the conductor.
Keep away from other conductors that might induce perturbing fields.
„ If necessary, check the origin of the trace again without the conductor in the jaws and repeat the
measurement.
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3. PROCEDURE

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