MI 3103 GigaOhm Measurements
11
How to carry out the measurement:
-
Select
Insulation resistance
function with appropriate test voltage using the rotary
switch knob.
-
Connect test leads to the item to be tested in accordance with figure 5.
-
Press
the
TEST
key and read the displayed insulation resistance result.
-
A double press of
TEST
key starts the continuous measurement. The measurement
is concluded after pressing
TEST
key again. The latest result will stay on the display.
Fig. 6. Example of displayed insulation resistance result
Notes!
If an external voltage higher than 20 V AC/DC is present at the test terminals, the
insulation resistance measurement will not be carried out after pressing START
key. Symbol ! will be displayed.
Tested item is discharged automatically after finishing the measurement and the
actual voltage is displayed during discharge operation (only if high capacity is
present on the test leads).
Positive pole of test voltage is attached to the red test terminal.
4.2 R
200mA
Continuity of protection conductors is measured before mains voltage is connected to
the tested installation (new or adapted installation). Max. allowed resistance value
depends on power of connected loads, used installation system (TN, TT), etc.
Test current of at least 200 mA is required by the EN 61557-4 regulation which is why
this function has to be used whenever tests are done in accordance with this standard.
For additional general information concerning this measurement refer to the handbook
Measurements on electric installations in theory and practice
.
Warning!
Make sure that the tested item is de-energised (mains voltage disconnected)
before starting the measurement! Fuse will blow if the test probes are
connected to the mains voltage during the test.
