www.megger.com
24
Operation
Making a measurement – three terminal resistance measurement using ART
1. Connect the instrument as below. Close the
Megger Current Clamp around the conductor under test.
I
CAT IV
300V
12-15V
1.2A
V
Electrode
under test
Potential
stake
Current
stake
2. Set the left hand rotary selctor switch to
RE
.
3. Set the right hand rotary selector switch to the
3P
position.
4. Press and release the
TEST
button [by holding the
TEST
button, the resistance measurement will be
continually updated].
The instrument will perform pre-measurement checks, the status of which will be indicated on the display. The
three-terminal resistance reading using ART will be displayed
Caution: Ensure that the Megger Current Clamp jaw mating surfaces are free of dust and
contamination. They must contact completely when the Megger Current Clamp is closed.
Note:
Currents carried by conductors in close proximity to the Megger Current Clamp may affect calibration and
reduce the accuracy of measurements made.
Note:
Re/Rs ratio must be less than 100, where Re = Ground resistance, Rs = Shunt resistance.