16
Megohmmeter Model 6505 - User Manual
3.5 PI MEASUREMENT
M
Ω
-1000V
M
Ω
-1000V
■
Set the switch to one of the insulation
measurement positions.
■
Start the measurement with a long press (> 2 s)
on the
START/STOP
button. The long press will
be acknowledged by an audible beep.
■
The measurement starts the default duration
of 10 min. A countdown will display the
time remaining. The measurement will stop
automatically.
Press the DISPLAY button to display:
Before the
measurement
(2 Presses)
■
Voltage present on the device to be tested.
■
Test voltage.
■
Leakage current present.
During the
measurement
(4 Presses)
■
Measurement time remaining.
■
Instantaneous insulation resistance value.
■
Test voltage.
■
Current flowing through the resistance being
measured.
■
Value of PI (available at the end of 10 min).
■
Value of DAR (available at the end of one min).
After the measurement
(6 Presses)
■
Test voltage generated during the measurement.
■
PI and DAR.
■
Duration of the measurement.
■
Insulation resistance value just before the
measurement was stopped.
■
Current that flowed in the resistance measured.
■
Voltage present on the device being tested.
■
Capacitance.
■
Surface leakage current.
The values of PI and DAR are calculated as follows:
PI = R 10 min / R 1 min (2 values to be recorded during a measurement
lasting 10 min).*
DAR = R 1 min / R 30 s (2 values to be recorded during a measurement
lasting 1 min).
*For the calculation of the PI, the times of 1 and 10 min can be modified by the
user, if required, for a particular application. See § 3.5.1.
