Measurement Function; Ac / Dc Voltage; Insulation Measurement - Chauvin Arnoux C.A 6549 Manual De Instrucciones

3. MEASUREMENT FUNCTIONS

3.1. AC / DC VOLTAGE

Turning the switch to an insulation position (position other than OFF or SET-UP) sets the instrument to
automatic AC / DC voltage measurement.
The voltage between the input terminals is measured at all times and indicated on the display unit: Input
Voltage.
Also, as soon as the switch is turned, the frequency and the residual DC current between the terminals of
the instrument are measured. The residual current is measured in order to evaluate its impact on the
insulation measurement to come.
The insulation measurements cannot be started if there is an excessively high external voltage on the
terminals.
Also, if an excessively high spurious voltage is detected during the measurement, the measurement is
automatically stopped : the symbol is displayed next to the measured external voltage (see § 3.2).
Switching between the AC and DC modes is automatics; in AC, RMS values are measured.

3.2. INSULATION MEASUREMENT

§ When the switch is turned to an insulation position, one of the following displays appears :
54