KYORITSU 3128 - Manual (Page 31)

KEW3128
27
KEW3128 6. Measurement
Note:
* Insulation resistance values of the equipment under test may not be
stable, and the readings on the LCD may be unstable.
* Oscillation sound may be heard during insulation resistance measurement,
but it is not malfunction.
* It takes time to measure a capacitive load.
* Measurements, right after a measurement complete, may not get started
even the Test Button is pressed. In such a case, press the Button in
several seconds later.
* At insulation resistance measurement, positive (+) voltage is outputted
from the Earth terminal and negative (-) voltage is outputted from the Line
terminal.
Connect the Earth Cord to the Earth (ground) Terminal. It is recommended
to connect the positive(+) pole to the earth side when measuring insulation
resistance against the ground or when a part of the equipment under test
is earthed. With this connection, smaller measured value can be obtained
comparing with other way round.
* Do not extend and use the test leads; it may affect on measurement
accuracy or impair the safety of this instrument.
* When measuring high resistance higher than 1TΩ, the Part A of the Line
Probe indicated in the below illustration shouldn’t be touched with the
things other than the measured object. In case that such a contact is
unavoidable, use something with high insulation resistance like Teflon or
foamed polystyrene, as a cushion.
* When making measurements without connecting the test leads to
anything to be tested, an over-range indication , e.g. “>35.0TΩ” (at 10kV
or 12kV Range), may not be displayed.
It is likely caused in high humidity environment due to currents leaked at
unexpected points other than the measured objects due to applying high
voltages.
* Proper measurements cannot be made due to influences of variations in
strong magnetic fields or noises caused at discharging energies stored in
A