▲
MEASUREMENT OF RESISTIVE CURRENT (Ior)
(At the grounding line)
1) Set the power switch "ON".
2) By "Ior SELECT" switch, set the circuit condition to Single Phase (1
φ
/Ir) or
Three Phase (
△
/Ir).
3) Set the range switch to the appropriate range to be measured.
(Select bigger range than the expected current value).
4) Open CT part and clamp it to the grounding line to be measured. Close CT
completely.
5) While reading the displayed value, set the range to the most appropriate one.
(If you can locate the instrument to the direction less influence of external magnetic
field, you can make measurement more accurately).
6) Press "Ior" switch one time. After approx. 6 seconds, the first Ior value will be
displayed. (Take average value of several times). By press "Ior" switch once again,
the mode will return to Io current measurement.
(Except for the grounding line)
・
In case of single phase/two or three wires, clamp CT to two wires or three wires
together. Setting of circuit is "1
φ
/Ir" by Ior SELECT switch.
・
In case of three phase/three or four wires, clamp CT to three or four wires all
together.
Setting of circuit is "
△
/Ir".
・
The operation procedure is same as for leakage current of grounding line.
Note
・
Do not mistake to set the circuit condition in case of Ior measurement
・
In case of harmonics current and Ior current measurements, cannot detect the values
unless the fundamental components (50/60Hz) are inputted more than 2% of full
scale
of each range.
・
Do not change the range according to the values of harmonics current. It may cause
errors.
・
By Auto Power Off function, the power will get off automatically approx. 10 minutes
after the final key operation.
・
When " " sign has appeared on the display during the use, it shows the
batteries are exhausted. Change the batteries to the new ones immediately.
