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9.3.1.1 Continuous Insulation Resistance Measurement
When the tester is powered on, it enters the default mode of continuous insulation
resistance measurement (250V output voltage). Connect test leads with measured
object, press
▲
and ▼ to select high-voltage range, press and to select fine-
tuned step voltage, then press “TEST” to perform test, the LCD shows basic elements
including battery power, high-voltage warning symbol (“2Hz” flashes), leakage current,
real-time output voltage, measured insulation resistance, testing value of analog bar
graph, continuous measurement duration, storage capacity, etc. Press “TEST” to
end the testing, turn off the testing voltage of insulation resistance, turn off the testing
indicator light, and automatically discharge fast (discharge course is displayed), the
LCD maintains current measured element on it.
9.3.1.2 Timer Measurement
Under insulation resistance testing condition without high voltage output, press “TIME”
to enter timer measurement mode.
When cycling through in insulation resistance measurement mode, the display of
timer measurement mode differs from that of other measurement modes.
There is no time setting interface in the default continuous mode interface, there is
PI symbol for polarization index measurement, and there is DAR symbol for absorption
ratio measurement.
When entering timer measurement mode, Time1 and timer symbol are displayed on
LCD, the default countdown of 05:00 flashes (mantissa) to indicate user can set the
time. Press and to select the digit (similar with cursor) of the time to be changed,
press ▲ and ▼ to change the value of the selected digit of the time, then press “ENTER”
to confirm and save the change or press “ESC” to cancel the change.
Press “TEST” to perform test, the LCD shows basic elements including battery power,
high-voltage warning symbol, leakage current, real-time output voltage, measured
insulation resistance, testing value of analog bar graph, Time1, set countdown time,
storage capacity, etc.
When the set time is up, the test ends automatically, the testing indicator light turns
off, and the tester automatically discharge fast (discharge course is displayed), the
LCD maintains current measured element on it.
Note: Before removing the lithium battery pack, please power off the tester and
remove all test leads to prevent electric shock!
9.3 Basic Measurement Operations
9.3.1 Insulation Resistance Measurement
Note:
To perform wiring and measurement operations, please wear high-voltage
insulation gloves and protective gear before testing.
Before testing, please make sure that the measured object is de-energized,
and do not measure the insulation of live equipment or circuit.
Please operate the tester with care as high-voltage output exists. Please
ensure good contact between measured object and test lead. Keep your hands
away from the test clips before pressing “TEST” button to perform test.
Do not short-circuit the two test leads during testing (high-voltage output state)
or measure insulation resistance after high-voltage output, otherwise it may
cause personal injury, fire or product damage.
Where R is the measured insulation, U is the tester output voltage and I is the
current of measured circuit.
R=
U
I
Calculation formula: (Ohm’s law)
Fig. 9.2.2 Charged with charging stand (optional: UT-W12)
UT512D/E User Manual
UT512D/E User Manual
For resistance below 1M
Ω
at the 250V range, the measurement duration cannot
exceed 10 seconds and multiple consecutive measurements cannot be performed.
For resistance below 2M
Ω
at the 500V range, below 5M
Ω
at the 1000V range,
and below 10M
Ω
at the 2500V range , the same limitations apply.
