Amprobe Multitest-1000 Continuity-Tester Manual de usuario descargar pdf (Pagina 36)

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.

B4B1

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

times the diagonal.

4. Press the START/STOP key. The instrument starts the test.

)

EARTH

0.96

Ω

0.93 Ω

t the end of the test the instrument

displays the values alongside.

WARNING

The display of “Measuring” means that the instrument is measuring. During

this phase never disconnect test leads.

verage value of earth resistance calculated over

test

ayed

Resistance value

measured

Mode “2P”.

START

STOP

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Amprobe Multitest-1000 Continuity-Tester Manual de usuario Pagina 36