Chauvin Arnoux C.A 6545 Notice De Fonctionnement page 55

 Utilisation of the R-DAR-PI-DD function
During or after a measurement, the R-DAR-PI-DD key is used to scroll through the values:
DAR (if measurement > 1 min)

(3)
 PI (if measurement > 10 min)
 DD can only be calculated 1 mn after the end of the insulation measurement and circuit
discharge, and only if it was selected before beginning the measurement
Capacitance in µF (only after the stopping of the measurement and the discharging of the circuit)

Leakage current circulating in the installation in µA or nA

Insulation resistance in M  or G  or T 

Note: During the measurement, the DAR value is not available if DD was preselected before the
measurement. During the measurement the value PI is not available if DAR or DD was preselected
before the measurement.
Automatic DAR or PI measurement:
If the R-DAR-PI-DD key is actuated during the voltage measurement before the start of a measurement,
the display is as follows:
- - - - M   
 
and the value of the input current (between terminals "+" and "-") is indicated.
Note: The input current may be a depolarisation current resulting from an earlier insulation measurement.
It is recommended to start a new DAR and PI measurement after the current has dropped to a
negligible value (on the order of 100 pA) to avoid variations on these measurements.
Depending on the choice (DAR, PI or DD), here is the measurement procedure:
a) DAR: press START   the DAR symbol fl ashes and the display indicates "- - - -" as long as the
calculation of the coeffi cient is impossible (t < 1 min).
For example:
After 1 min. the measurement stops, the DAR symbol becomes steady and the main display
automatically shows the DAR value if the calculation was possible.
The R-DAR-PI-DD key may be used during and after the measurement to see the insulation
measurement performed, but it does not provide the PI value, since the measurement did not last
long enough.
b) PI: press START   the PI symbol fl ashes and the display indicates "- - - -" as long as the calculation
of the coeffi cient is impossible (t < 10 min).
For example:
After 10 min. the measurement stops, the PI symbol becomes steady and the main display
automatically shows the PI value if the calculation was possible.
During and after the measurement, the R-DAR-PI-DD key is used to display the DAR (after 1 min),
the PI (after 10 min.) and the insulation measurement.
c) DD: press START   the DD symbol fl ashes and the display indicates "- - - -" as long as the calculation
of the coeffi cient is impossible (insulation-measurement time + 1 min.).
(3): For the PI calculation, the 10 and 1 minute times can be modifi ed in the SET-UP menu, so to adapt
to any normative changes or specifi c applications.
 
DAR - - - - PI - - - -
DAR - - - -
PI - - - -
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 
DD - - - -