VOLTCRAFT EMZ-1000 Bedienungsanleitung Seite 43

After that connect the RC and RA as shown in the figure below. Use the tester to obtain the
third reading R3.
EMZ-1000
In the three steps above, the each of the readings is the array value of the two grounding resist-
ances. Thus, we can easily calculate the value of each of the grounding resistances:
R1 = RA + RB,
R2 = RB + RC,
R3 = RC + RA
RA = (R1 + R3 - R2) / 2
This is the grounding resistance value of the grounding body RA. This formula can be easily
memorised by imagining that these three grounding bodies form a triangle; then the measured
resistance is equal to the sum of the resistance values of the adjacent edges minus the resist-
ance value of the opposite side and divided by 2.
The grounding resistance values of the two other grounding bodies are as follows:
RB = R1 - RA
RC = R3 - RA
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