KYORITSU 3128 User Manual

Page 31

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