Ground Resistance Tester Models 3711 and 3731
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Digital Display Features
+
m
A
R
.1
HOLD
MEM
MR
NOISE
Displayed when the beeper is active. To turn the beeper On/Off,
push ON & Ω together at power-up. The beeper is active when
displayed.
Displayed when the HOLD function is activated. This function
locks the present displayed value. During HOLD: A, Ω, and
Alarm functions are deactivated. The Memory function may still
be used.
Indicates that the jaws of the instrument are not properly closed.
The Open Jaw indication is present only in the Ω Mode. Check
for foreign matter in the jaw mating surface.
In the Ω function, this symbol indicates the presence of
excessive stray noise in the ground electrode under test. This
symbol will be present if noise signals reach an amplitude of
approx. 5A or 50V. Resistance measurement values are no
longer valid. The beeper is also activated.
Displayed when measured resistance is below 0.1Ω. This may
indicate that grounding electrode you are clamped onto is
continuous with itself (the instrument is measuring a metallic
loop and not the ground electrode resistance). In this situation,
electrode resistance measurements may not be valid. The main
display can measure between 0.7 to 0.07Ω, but without any
specified accuracy.
Current measurement mode.
Ground resistance measurement mode.
Figure 3
HOLD
NOISE
mA, A
R
.1
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