10
GroundFlex™ Adapter Model 6474
7.
The device calculates and stores a calibration coefficient for the GroundFlex
™
sensor connected to channel 1.
4
H
E
S x 1
1
AUTO
mA
m A
This operation must be repeated for channels 2, 3 and 4; the
INPUT SELECTION
switch must be set to the corresponding position each time.
The calibration values are now stored into memory.
NOTE:
Always connect the same sensor to the same input.
2.3 Measurements in AUTO Mode
2.3.1 Preparation
The GroundFlex
™
Adapter Model 6474 is designed to be used only with the Model
6472 device. The two devices must be connected using the special connection
cable supplied. The Model 6474 has no ON/OFF button, and is powered only by
the Model 6472, via this connection cable.
The Model 6474 is intended primarily to measure the current that flows through a
high-voltage pylon to the ground. You can wrap up to 4 legs of the pylons each with
a GroundFlex
™
sensor and measure the current flowing to earth through each of
the legs or through several legs.
After calibration, the GroundFlex
™
sensors must always be connected to their re
-
spective channels.
1.
Set the switch to GroundFlex
™
.
When you connect the GroundFlex
™
Adapter Model 6474 to the 6472, a self-
test will begin. During this test, the OVERLOAD check light on the 6474 is lit.
2.
Connect the required number of sensors to channels 1, 2, 3, and/or 4.
NOTE:
The direction of coiling of the GroundFlex
™
sensors around a conductor
has no effect on the measurement, but
all
of the GroundFlex
™
sensors must
be coiled in the same direction and have the same orientation (check the
arrow on the connector of the sensor) and they must
all
have the same
number of turns.
