Chauvin Arnoux C.A 6505 Notice De Fonctionnement page 42

The measurement starts for a duration of 10 min.
A countdown displays the time remaining.
min min sec
Press the DISPLAY key to display:
Before the measurement
(2 presses)
During the measurement
(4 presses)
After the measurement
(6 presses)
The values of PI and DAR are calculated as follows:
PI = R R
10 min / 1 min
DAR = R R
1 min / 30 s
They are especially useful for monitoring the ageing of the insulation of revolving machines or of very
long cables.
On items of this type, the measurement is initially perturbed by spurious currents (capacitive charging
current, dielectric absorption current) that gradually cancel out. To measure the leakage current
representative of the insulation accurately, it is therefore necessary to make measurements of long
duration.
2 : For the calculation of the PI, the times of 1 and 10 minutes can be modified by the user, if required,
for a particular application. See § 4.1.
the voltage present on the device to be tested,
the test voltage,
the leakage current present.
the measurement time remaining,
the instantaneous insulation resistance value,
the test voltage,
the current flowing in the resistance being measured,
the value of the PI (available at the end of 10 mn),
the value of the DAR (available at the end of one minute).
the test voltage generated during the measurement,
the PI,
the DAR,
the duration of the measurement,
the insulation resistance value just before the measurement was
stopped,
the current that flowed in the resistance measured,
the voltage present on the device being tested,
the capacitance,
the surface leakage current.
(2 values to be recorded during a measurement lasting 10 mn)
(2 values to be recorded during a measurement lasting 1 mn)

And the measurement stops automatically.
PI
V
2