AEMC 6470-b User Manual page 44

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
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.
• The screen now displays EARTH COUPLING 2. Make a 3-pole earth mea-
surement on the second earth system (measurement of R
measurement, leave the H (Z) and S (Y) electrodes in the same positions as
for the first measurement.
• Store this result in the same memory location as before by pressing the
MEM button twice.
The screen now displays the message EARTH COUPLING 3. Disconnect
•
terminal S (Y) and make a 2-wire resistance measurement with terminal H
(Z) connected to earth 1 and terminal E (X) to earth 2.
Record this result by pressing the MEM button twice.
•
• EARTH COUPLING 4 and the results of the measurements are displayed.
The calculation is based on the following formulas:
R = (R
C
C = R
1
R = R
b
To display all of the measurement parameters, press the MR button.
•
• To scroll through all of the measurements, use the ► and ▲ buttons.
42
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