TENTECH MD-5075x, User Manual, Page: 23 / 69

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8. Other functions
8.1. Backlight
The equipment display has a backlight. In order to activate it, press
key. After 10 seconds the backlight will auto-turn off. If you want to
reactivate it, press
key again.
8.2. Filter
When insulation measurements are carried out in transformers or in large
dimension machines, in presence of strong electromagnetic fields, it is
possible for the equipment reading to be unstable, especially for
resistance values higher than 100 M
Ω. In these cases it is convenient to
press the key before starting the measurement activating the filter
which allows for the reaching of the insulation resistance value in an
upward curve without significant oscillation.
8.3. True RMS AC/DC Voltmeter
In order to use this function, connect the test points and turn on
MD-5075x . The measured value will be exhibited automatically in the
display.
AC DC
10 V up to 1000 Vr.m.s. 10 V up to 1000 V
Precision: ± (5% of the r 3 digits)
8.4. Leakage current measurement
During the tests, the equipment measures and exhibits in the display the
leakage current value within a range of 1 nA up to 3 mA, with a Precision
of ± (10% of the r 3 digits).