Multimetrix EIIT 810 Manual De Funcionamiento página 12

3P measurement
method
2P measurement
method
Analog earth & insulation tester
- the simplified measurement method using only 1 auxiliary rod: 2P method
1 – connect the cables and auxiliary rods remembering first of all to disconnect
the earthing strip of the installation:
connect the green test cable to terminal E, the yellow cable to terminal P, and
the red cable to terminal C.
place the auxiliary rods in line with the rod of the earth electrode to be
measured.
connect the Green cable E with the earth electrode to be measured, the yellow
P and red C cables with the auxiliary rods as shown in figure 1 below:
2 – check the earth voltage
set the rotary switch to the EARTH VOLTAGE position.
start the measurement by pressing the TEST key.
the earth voltage will then be indicated on the ACV scale of the galvanometer.
Important:
If the measured earth voltage is greater than 10 VAC, the earth electrode
resistance measurement will undoubtedly be erroneous.
3 – measure earth electrode resistance
set the rotary switch to EARTH RESISTANCE
select the probable measurement range on the range selector (item 4).
start the measurement by pressing the test button and read the result on the
display unit.
to carry out a stability measurement (over a longer period), press and turn the
test button.
the FUNCTION indicator must be lit, proof that the measurement current circuit
is correctly established.
This method is an alternative to the 3P method only when the resistance of the
earth electrode is greater than 10 Ω or when it is impossible to place two auxiliary
rods in line.
Attention, this method will yield an approximate earth resistance value.
1 – connect the cables and auxiliary rods without forgetting to disconnect the
earthing strip of the installation:
connect the green test cable to terminal E and the double red cable to terminals
P and C of the instrument.
place the auxiliary rod where it is possible to place a rod.
connect the Green cable/E to the earth electrode to be measured and the red
cable / P&C to the auxiliary rod as shown by figure 2 below:
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