Ground Resistance Tester Models 3711 and 3731
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Resistance
The Ω function provides resistance measurements from 0.1 to 1200Ω in
seven autoranges. (Fig. 9).
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 Models 3711 and 3731 will track down to
0.07Ω and indicate
R
.1
below 0.1Ω (Fig. 10).
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. 11). This may
indicate high ground resistance but may also be
caused by a disconnected or poorly bonded
ground.
Figure 9
Figure 10
Figure 11
A
ON
OFF
A
Ω
ON
OFF
A Ω
ON
OFF
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