Use; Measurement Procedure; Insulation Measurement - Chauvin Arnoux C.A 6545 Notice De Fonctionnement

5.1. MEASUREMENT PROCEDURE

 Start up the instrument by setting the switch to the desired measurement position. All the segments
of the LCD screen are displayed, then the battery voltage.
 Connect the + and - leads to the measurement points.
 The input voltage is measured continuously and indicated on the small display.
If an external voltage higher than the authorised limit value (see § 3.2) is present, the
measurement will be inhibited.
 A press on START/STOP starts the measurement.
 Another press on START/STOP stops the measurement. The last result remains displayed until the
next measurement or the rotation of the switch.
If a voltage higher than the authorised limit value (see § 3.2) appears during all the measurements, the
device will indicate this voltage on the small display using the fl ashing warning symbol and stop the
measurement in progress.
Note: A certain number of special functions may be used (see § 4).

5.2. INSULATION MEASUREMENT

(See § 3.2)
With this function, the instrument can measure insulation between 10 k  and 10 T  , according to the
chosen test voltage (among 500 - 1000 - 2500 - 5000 V) or programmed voltage (between 40 V and 5100 V).
 Position the switch on "500 V-2 T  ", or "1000 V-4 T  ", or "2500 V-10 T  ", or "5000 V-10 T  " or
"Var 50-5000 V"
 Connect the device to the part to be tested.
If the voltage present is higher than the authorised limit value (see § 3.2) the measurement
will be inhibited.
 Start the measurement and note the results.
It is possible to scroll through all the results on the main display using the R-DAR-PI-DD key (see § 4.3)
or on the small display using the V-TIME key (see § 4.2).
R(t) is used to access the intermediate values measured and stored at a rate set in SET-UP, in
"Programmed-time test" mode. These samples are available until the start of another measurement or
until the next rotation of the switch (see § 4.3)
To measure high insulation values (> 1 G  ), you are advised to use the "G" guard terminal to remove
the infl uence of surface leakage currents. The guard terminal should be connected to a surface where
surface leakage currents may fl ow via dust and humidity: for example, the insulation surface of a cable
or transformer, between two measurement points.
As soon as insulation measurements stop, the tested circuit is automatically discharged via an
internal resistor of the device.

5. USE

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