Capacitance Measurement; Residual Current Measurement; Special Functions; Mode/Print Key - Chauvin Arnoux C.A 6549 Mode D'emploi

where - Upeak : external voltage, peak or DC, on the terminals of the instrument.
- dlSt : coefficient that can be adjusted in SET-UP - 3% (defaut 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
defined below is detected, the measurement is stopped and the symbol
the external voltage measured.
where - Upeak : external voltage, peak or DC, on the terminals of the instrument.
- dlSt : coefficient that can be adjusted in SET-UP - 3% (defaut value), 10% or 20%.
- Un : test voltage selected for the insulation measurement.
Note :
The dISt factor is adjusted to optimize the measurement build-up time.
If there is no spurious voltage, dISt can be adjusted to its minimum value to obtain the shortest possible
measurement build-up time.
If there is a large spurious voltage, dISt can be increased so that the measurement will not be interrupted
as soon as a negative alternation occurs during the generation of the test voltage; this amounts to optimizing
the measurement build-up time in the presence of a spurious voltage.
§ Pressing the START/STOP key again stops the measurement
If the "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 and PI modes are selected as measurement modes, the measurement is stopped
only after the time needed to calculate them (time defined in SET-UP).
A number of special functions can be used during the measurement (cf. § 4.).

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 during and after the insulation measurement.
4.1. MODE / PRINT KEY
The primary function of the MODE key is very important : it is used before the
measurement to define the course of the measurement.
This key is inactive in the "Adjust. Step" and SET-UP positions.
Pressing the MODE key gives access to the list of possible measurement modes. Select the mode
using the 5, 6, 4 and 3arrows.
U peak ≥ dlSt x Un
U peak ≥ (dlSt + 1,05) x Un,

4. SPECIAL FUNCTIONS

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appears next to the value of