6. MEASURING CONSIDERATION FOR
Meg OHM TESTING
1) The amount of time during which the test voltage applied will
also affect the reading. With good insulation, the measured
value of insulation resistance will slowly increase is applied
typically. This is due to dielectric absorption effect of the
applied DC voltage on the bulk insulation resistance.
2) Measurements made in a humid environment will result in
lower insulation resistance values than a dry environment.
7. RS-232 PC SERIAL INTERFACE
The instrument has RS232 PC serial interface via a 3.5
mm terminal ( 3-4, Fig. 1 ).
The data output is a 16 digit stream which can be
utilized for user's specific application.
A RS232 lead with the following connection will be
required to link the instrument with the PC serial port.
Meter
PC
(3.5 mm jack plug)
(9W 'D" Connector)
Center Pin.............................Pin 4
Ground/shield..........................Pin 2
2.2 K
resistor
Pin 5
8
