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Safety Check - Voltage Test
NOTE: Make sure the jacks are firmly inserted into the megohm-
meter prior to performing any electrical tests!
Before measuring insulation resistance, confirm that the sample is
fully discharged (particularly in dielectric and capacitance samples),
and that the sample is not connected to an energized circuit. To per-
form the voltage test:
1) Insert the red lead into the +earth position and the black lead in the
middle jack position.
2) Set the range selection switch to the VAC position.
3) Connect to the sample
under test.
4) Press the test button.
Insulation Resistance Testing (MΩ Range)
After checking for a live circuit (see Safety Check), connect the
megohmmeter. See Figures 4 through 11 for examples.
TEST VOLTAGE
No published standard tells which voltage to choose for any given
winding. However, published recommendations are summarized as
follows:
Rated Voltage of Motor
Below 115
115
230
460
Megohmmeter Models 1020 and 1025
- Line
Test Voltage
250 V
250 V or 500 V
500 V
500 V or 1000 V
MΩ
~
V
/Ω
AC
+ Earth
Figure 3
9
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