Ground Resistance Tester Model 6471
47
6.4 3-Pole Earth/Ground Measurements & Coupling
6.4.1 3-Pole Earth/Ground Measurements
Pressing on
Hz/OPTIONS
in
MANUAL
mode allows the following parameters to
be changed using the ► button:
•
EARTH blinks
Earth Coupling Measurement
•
128 Hz blinks
Test Frequency Measurement
•
Test voltage blinks
Test Voltage Selection
6.4.2 Earth/Ground Coupling Measurements
This measurement calls for making and storing three intermediate measurements
(at the same frequency). It is available only in
MANUAL
mode.
Connection diagram:
R
C
R
2
R
b
R
1-2
R
A
R
1
Measurement #3
Earth 1
Earth 2
Measurement #2
Measurement #1
Press
Hz/OPTIONS
and use the ► button to switch from
EARTH
to
EARTH COU-
PLING
. Proceed as follows:
•
If you want to eliminate the resistance of the measurement leads, you can
use lead compensation (
2nd + START
) before starting the actual coupling
measurement (see § 5.2.1).
• Turn the rotary switch to 3-Pole.
•
Select a test frequency and a test voltage (if desired).
•
The screen displays
EARTH COUPLING 1
. Make a 3-pole earth measure-
ment on the first earth system (measurement of R
1
in the connection dia
-
gram on previous page).
•
Stop the measurement by pressing the
START/STOP
button. The
MEM
symbol flashes to indicate that this result must be recorded in memory.
Press the
MEM
button twice. To save to another location, refer to §7.1.
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