Capacitance Measurement; Residual Current Measurement - Chauvin Arnoux C.A 6549 Notice De Fonctionnement

 If, when the START key is pressed, the external voltage on the terminals of the instrument is greater
than the value U peak defi ned below, the insulation measurement is not triggered and an audible
alarm is emitted; the instrument then returns to automatic voltage measurement.
where - Upeak: external voltage, peak or DC, on the terminals of the instrument.
- dlSt: coeffi cient that can be adjusted in SET-UP - 3% (default value), 10% or 20%.
- Un: test voltage selected for the insulation measurement.
 Similarly, if during the insulation measurements, an external voltage greater than the value U peak
defi ned below is detected, the measurement is stopped and the symbol
value of the external voltage measured.
where - Upeak: external voltage, peak or DC, on the terminals of the instrument.
- dlSt: coeffi cient that can be adjusted in SET-UP - 3% (default value), 10% or 20%.
- Un: test voltage selected for the insulation measurement.
Note: Adjust the dISt factor to optimize the measurement build-up time. If there is no disturbance voltage,
dISt can be set to its minimum value to obtain the shortest possible measurement build-up time.
If there is a large disturbance voltage, dISt can be increased so that the measurement can be
started and will not be interrupted.
 Pressing the START/STOP key again stops the measurement.
If a "programmed time test" mode (Timed Run or Timed Run + DD) was selected as measurement
mode, the measurement is stopped (without action on the START/STOP button) at the end of this time.
Similarly, if the DAR or PI mode is selected as measurement mode, the measurement is stopped after
the time needed to calculate them.
Note: When measuring resistances smaller than the resistance range indicated for the selected test
voltage, the test voltage is automatically reduced. So 10 k  can be measured as the minimum
resistance regardless of the selected test voltage..

3.3. CAPACITANCE MEASUREMENT

The capacitance measurement is performed automatically during the insulation measurement, and is
displayed after the measurement stops and the circuit has been discharged.

3.4. RESIDUAL CURRENT MEASUREMENT

The residual current circulating in the installation is measured automatically upon connection to the
installation, then before and after the insulation measurement.
U peak  2 x dlSt x Un
U peak  (dlSt + 1.1) x Un,
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appears next to the