HT instruments SIRIUS87 - Manual (Page 56)

SIRIUS 87
EN - 54
4.6.2. Measurement procedure for "3P" test mode
The measurement is taken according to what prescribed for VDE 0413, IEC/EN61557-5.
1. Select "
3P" earth measurement mode by means of the F1 key.
2. Connect the Black, Red, Green and Blue cables to the corresponding input terminals of the
instrument B1, B2, B3, B4 (see Fig. 21).
3. Connect the black, and green cables to the earth plant and red and blue cables to the
auxiliary rods.
Fig. 21: 3 points earth resistance measurement
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
time the diagonal.
4. Press
the
START/STOP key. The instrument starts the test.
 At the end of the test the instrument
displays the values alongside.
EARTH
0.96


2P 0.93 
CAUTION
The display of
“Measuring” means that the instrument is measuring. During
this phase never disconnect test leads.
SAVING:
The tests can be stored pressing the
SAVE key twice
(according to § 5.1).
START
STOP
Mode “2P”.
Valore della
resistenza
misurato
Average value of earth resistance calculated over
the number of test displayed.
SAVE