AEMC 6471 - 4-Pole Earth;Ground Measurements; Soil Resistivity Measurements; Measurements with Two Clamps; Smoothing

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
1E
arth 2
Measurement
#2Measurement
#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 rst 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 ashes 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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