Measurement Functions; Voltage Measurement; Insulation Measurement - Chauvin Arnoux C.A 6505 Manual De Instrucciones

3. MEASUREMENT FUNCTIONS

3.1. vOLTAGE MEASUREMENT

As soon as the switch is set to an insulation measurement position, the instrument automatically
measures the presence of any AC/DC voltage. This voltage is measured at all times and indicated on
the small display unit.
The instrument automatically determines AC or DC: the AC measurement is an RMS value
If an excessively high external voltage is present on the terminals (> 0.4 Un), pressing the START button
has no effect and no measurements are made. Similarly, if an excessively high spurious voltage (> 0.4
Un) is detected during the measurement, the measurement is automatically stopped.

3.2. INSULATION MEASUREMENT

Depending on the measurements to be made, there are three ways to connect the instrument.
In all cases, disconnect the device to be tested from the source.
Weak insulation

Connect the red high-voltage lead
between earth and the + terminal of the
instrument.
Connect the black high-voltage lead
between one phase of the motor and the
- terminal of the instrument.
Strong insulation

For a very high insulation value, connect
the small blue high-voltage lead between
the rear earth pick-up jack of the
black lead and the G terminal of the
instrument.
This serves to reduce any external
influence and obtain a more stable
measurement.
1 : RMS (Root Mean Square): root-mean-square value of the signal, determined by taking the square
root of the mean value of the signal squared.
-
M
-
M

.
1
+
+
G