ERICO EST401 ERITECH Clamp-on Ground Resistance Tester - Manual (Page 13)

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Function Controls
Resistance
The Ω function provides resistance measurements
from 0.1 to 1200Ω in seven autoranges. (Fig. 8).
Range Resolution
0.07 to 1Ω 0.01Ω
1.0 to 50.0Ω 0.1Ω
50 to 100Ω 0.5Ω
100 to 200Ω 1Ω
200 to 400Ω 5Ω
400 to 600Ω 10Ω
600 to 1200Ω 50Ω
Upon initial power-on, the Ω function is chosen
by default.
The EST401 will track down to 0.07Ω and
indicate below 0.1Ω (Fig. 9). Accuracy is not
defined below 0.1Ω. Measurements below 0.1Ω
typically (or even 1Ω) indicate the ground tester is
clamped onto a closed loop and that the signal
is not flowing through the ground under test.
If the resistance readings are above 1200Ω, OL will
be displayed on the LCD (Fig. 10). This may indicate
high ground resistance but may also be caused by a
disconnected or poorly bonded ground.
A
ON
OFF
EST401
GROUND TESTER
Figure 8
Figure 9
Figure 10
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