Measurement Procedure For "3P" Test Mode - Amprobe MultiTest 1000 Manual Del Usuario

4.4.2. Measurement procedure for "3P" test mode

The measurement is taken according to what is prescribed for CEI 64.8, IEC 781, VDE
0413, EN61557-5.
1. Select "3P" earth measurement mode using the F1 key.
2. Connect the Black, Red, Green and Blue cables to the corresponding input terminals of the
instrument T1, T2, T3, T4 (see possible connections in the following picture).
3. Connect the black, and green cables to the earth plant and red and blue cables to the
auxiliary rods.
Measuring small earth plants, current probe must be positioned a distance from the earth
equipment outline corresponding to five times the diagonal of the area of the earth
equipment under test, measuring big earth plants this distance could be reduced up to one
times the diagonal.
START
4. Press the START/STOP key. The instrument starts the test.
STOP
At the end of the test the instrument
displays the values alongside.
Average value of earth resistance calculated over
the number of test displayed.
The display of "Measuring" means that the instrument is measuring. During
this phase never disconnect test leads.
3 points earth resistance measurement
WARNING
B1 B2 B3 B4
EARTH
0.96
Ω
2P
0.93 Ω
Resistance value
measured
Mode "2P".