‘locked on’ by pressing the
key while the TEST
button is held down. The
warning
will appear on
the display and both
buttons may be released
whilst the test continues.
The next press of the test
button will terminate the
test.
Note: There is a safety
delay of a few seconds on
the first operation of
‘1000V’ range, each time
the range is selected.
Polarisation Index Testing
Polarisation Index (PI) is the term applied to the Dielectric
Absorption Ratio when resistance values are measured after 1
minute and again after 10 minutes. Polarisation Index is then the
resistance value after 10 minutes divided by the resistance value
after 1 minute. The test can be run at any voltage. More detailed
information on PI Testing and value assessment can be found in
Megger Limited publications listed in the Accessories page.
Automatic Discharge
When the TEST button is released after an insulation test (or
re-pressed if ltb feature is enabled), a 200kΩ load is
automatically switched across the terminals to discharge the
item under test. Any voltage present will be indicated on the
display so that the discharge can be monitored.
TYPICAL TERMINAL VOLTAGE CHARACTERISTICS
Continuity Testing (Ω) (See fig.2)
The continuity tests are activated when the probes make
contact of less than a few kΩ. The tests apply a constant
current and measure the resulting volt drop across the circuit
under test. The test operates without the need to press the
TEST button. When the test leads are removed the reading will
hold for a few seconds and then reset. This range is not
suitable for diode testing since the automatic contact detector
∼
FIG.1
