Sonel MIC-2 - Page 8

OPERATING MANUAL MIC-2 ver. 1.8
6
ter uses the technical insulation measurement
method (R
X
=U/I). The measurement voltage is se-
lected between the two following values: 250V or
500V.
The level of the output current of the converter
is 1 mA. Activation of the current limitation is sig-
nalled by means of a continuous sonic alarm. The
result of the measurement is then correct, but at
the measurement terminals there is a measure-
ment voltage which is lower than the one adjusted
before the measurement. The current limitation
may occur particularly often in the first stage of the
measurement due to the process of charging of the
capacity of the measured object.
Proper
measurements
Insulation
resistance Rx
Measurement voltage
500V
500k
C
u
r
r
e
n
t
l
i
m
i
t
a
t
i
o
n
s
t
a
t
u
s
250V
250k
The actual measurement voltage as the
function of the measured insulation resistance
R
X
(for the maximum measurement voltage).