VR2250
Page 20 of 131
6.2. M
Ω
: INSULATION RESISTANCE MEASUREMENT WITH 50V, 100V, 250V,
500V, 1000V TEST VOLTAGE
These measurement comply with IEC 61557-2 and VDE 0413 part 1.
CAUTION
Before affecting the insulation test make sure that the circuit under test is
not energised and all the loads are disconnected.
Turn the
switch
to the
M
Ω
position.
The key
F1
permits to select one of the following measuring modes:
Mode "
MAN"
(Manual mode). Recommended test.
Mode "
TMR
" (Timer mode: test duration depends on the selected interval
from 10 to 999 seconds). This test can be performed when the test
requires a defined duration.
6.2.1. Measurement Procedure
1. Select the desired mode by means of the
F1
key.
2. Connect the test leads to the instrument input terminals
B1
and
B4
respectively,
M
B2
B3
B4
B1
I1
Example: insulation measurement between phase L1 and earth in a 3 PHASE electrical installation
using test leads.
3. If the cables supplied with the instrument are not long enough for the measurement
you can extend the black cable.
4. Connect the instrument terminals to the object which is to be submitted to the
insulation test
after de-energizing the circuit under test and all the relative
loads
(see previous picture).
5. By means of
F2
select the test voltage suitable for the type of test to be carried
out (see Table1). The values to be selected are:
•
50V (test on telecommunication system)
•
100V
•
250V
•
500V
•
1000V
BLACK
RED