Clamp-on Ground Resistance Tester Model 6417
29
6. MEASUREMENT MODES
6.1 Rotary Position
W
+A
6.1.1 Standard Mode
Selection of Standard mode is performed in the
SET-UP
(see § 4.4, menu #9).
In Standard mode, only one measurement screen is available. The clamp
measures the loop impedance (
W
) (at the fixed frequency of 2083Hz) and the
leakage current.
NOTE:
Since the measurement frequency is audible, the operator hears a beeping
signal. This is neither an operating fault nor an alarm, and it cannot be eliminated.
This audible signal is amplified by the presence of current in the loop.
The alarm thresholds can be configured as desired (see
4.4, menus #4, #5 &
#6).
6.1.1.1 Making a Measurement
■
Turn the rotary switch to the
Ω+A
position, and wait several seconds
while the instrument performs internal calibration.
■
Clamp around the conductor to be measured. If the clamp is incorrectly
closed, the
icon is displayed.
■
If necessary, use the
HOLD
button to freeze the measurement.
■
If necessary, use the
MEM
button to store the measurement.
NOTE:
If the measured impedance is less than the Loop Alarm setting defined in
the DataView Ground Clamp Control Panel (which by default it 1
W
), the display
alternates between the value measured and the word
LOOP.
This calls the user’s
attention to the possibility that the measurement is likely the resistance through
a local metal path rather than through earth. Note that the Loop Alarm can be dis-
abled via the Control Panel. (See § 7 for information about installing the Ground
Clamp Control Panel.)
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