14
Insulation Measurements
Insulation measurement results can be affected by the impedances of additional circuits
connected in parallel or by transient currents. Do not start any measurement while the
symbol
is displayed.
1. Set the rotary switch to one of the
MΩ
positions. The test voltage depends on the voltage of the
installation to be tested.
2. Use the leads to connect the system to be tested to the instrument's terminals. The system under
test must be powered down and discharged. When testing insulation, the typical connection is
negative (black) lead to conductor and positive (red) lead to ground or the outer insulation of the
device under test.
3. (Optional) Press the
u
button to display the current or the elapsed time. (You can also do this
during the measurement.)
4. Press the
TEST
button and hold it down until the displayed measurement is stable. Note that if the
instrument detects a voltage greater than 25V in the system under test, pressing the
TEST
button
has no effect because the test will be prohibited. (An error screen will appear.)
V
DC
100V
V
k
Ω
MR
OFF
Ω
250V
500V
1000V
50V
M
Ω
