MRU-120
– USER MANUAL
22
Use buttons
and
to set the
measuring voltage and press
ENTER
.
Press
START
in order for the test to
commence measurement.
Read out the result.
Current electrode resistance
Voltage electrode resistance
Additional uncertainty caused by
the resistance of the electrodes.
The result is displayer for 20 s.
It may be displayed again
ENTER
is
pressed.
S
Repeat the measurements (see points 2 and 5) moving the
voltage electrode by a couple of meters: approaching it to and
moving it away from the tested earth electrode.
If the R
E
test results differ more than 3%, then it is necessary
to increase significantly the distance between the current elec-
trode from the earth electrode in question and repeat the gaug-
ing.
Notes:
Earth resistance measurement may be realised if the interference voltage does
not exceed 24 V. The interference voltage is measured up to 100 V. Do not con-
nect the meter to a voltage exceeding 100 V.
- The clamps are not the part of meter basic accessories, you have to purchase them apart.
- The clamp must be calibrated before it is used for the first time. It may be periodically calibrated in
order to avoid the influence of the ageing elements upon the resolution of measurements. The clamp
calibration option is in the
MENU
.
- Pay particular attention to the quality of the connection of the tested object with the test leads
–
the contact area must be cleaned of paint, rust, etc.
- If the resistance of the auxiliary electrodes is too high, then the measurement of the R
E
earth elec-
trode will be distorted by additional uncertainty. A particularly high measurement uncertainty is gen-
Summary of Contents for MRU-120
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