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17
Model UT511: OPERATING MANUAL
When performing insulation resistance tests,
remove all power from the circuit to be measured
and discharge all the power.
Do not short circuit two test leads under high
voltage status.
Do not measure insulation resistance after high
voltage output.
Do not measure over 10 seconds when:
100V measure resistance lower than 500k
250V measure resistance lower than 1M
500V measure resistance lower than 2M
1000V measure resistance lower than 5M
When the measurement is completed, don’t
touch the circuit as the circuit has already stored
capacitance which may cause electric shock.
Don’t touch the test leads even after it has been
removed from the circuit until voltages are all
released.
Caution
To measure insulation resistance, set up the Meter as
Figure 5 and do the following:
1.
2.
3.
4.
5.
Press
HO
button to select insulation resistance
measurement.
Press and button to select voltages of 100V,
250V, 500V or 1000V.
Insert the red test lead into the
LINE
terminal and
the black test lead into
EARTH
terminal.
Connect the red and black alligator clip to the circuit
to be measured, positive voltage output from
LINE
terminal.
Choose below insulation resistance measurement
mode.
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Press
TIME
button to select continuous
measurement mode, there is no timer icon on
the LCD.
Press and hold
TEST
button for 1 second to
carry out continuous measurement. Output
insulation resistance testing voltage,
TEST
button
light up,
blinks on every 0.5 seconds.
