GOSSEN-METRAWATT
15
Example
You measure an insulation resistance of 179.3 k
Ω
on the
300 M
Ω
measuring range at a nominal voltage of 1 000 V.
The following is shown on the LCD display (5):
Then switch to the 300 k
Ω
measuring range. The display
changes as follows:
í
With manual range selection, all features of the tester, as
described in section „7.1 ISO-
Ω
measurement up to
3 G
Ω
with autoranging“, apply analogously.
í
The tester switches back to autoranging when you briefly
press the pushbutton „AUTO /
⊗
“ (2).
7.3
Evaluation of the measured values
So that the limits of the insulation resistance required by
DIN VDE specifications are not fallen below under any con-
dition, the measuring error of the insulation tester must be
considered. The required minimum display values for insula-
tion resistances which may be indicated with consideration
of the maximum service error of the insulation tester (under
nominal conditions of use) without exceeding the specified
limits (DIN VDE 0413 Part 1) can be found from the follow-
ing table. Intermediate values can be interpolated.
The service error is different on the three nominal voltages
ranges. That is why different minimum display values must
be considered, depending upon the selected nominal volt-
age.