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2
Making Measurements
Insulation Resistance Test
Set up your tester as shown in
value that does not exceed the maximum voltage limitation of the circuit under
test. Ensure that the device-under-test (DUT) is de-energized before performing
any resistance measurement.
Table 2-1
Rotary switch position for insulation resistance tests
Legend
Defaul t function
Rotary switch
Primary d isplay
position
50 V insulation
resistance test
100 V insulation
resistance test
250 V insulation
resistance test
500 V insulation
resistance test
1000 V insulation
resistance test
– DO NOT perform insulation resistance test in distribution systems with
CAUTION
– The tester automatically detects if the circuit is energized. If the external
52
Secondary d isplay
AC+DC V
or
DC V (during test)
voltages higher than 600 V.
voltage is detected to be greater than 30 V (or 50 V or 75 V; depending on
selected option in Setup), the test is inhibited. The symbol
the display when either the external voltage or the test voltage is greater
than 30 V. Disconnect the tester and remove the power of the circuit
before proceeding.
Figure
2-1. Set the rotary switch to a test voltage
Function when
Primary d isplay
1 Timed (T) test
2 Dielectric
Absorption Ratio
(DAR) test
3 Polarization
Index (PI) test
is pressed
Secondary d isplay
AC+DC V
or
DC V (during test)
is shown on
U1461A/U1453A User's Guide
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