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AD-4410
10.4. Confirming the load cell connection with a digital multi meter
The load cell connection can be checked easily using a digital multimeter.
Figure 14 shows points to confirm the load cell connection.
When a summing box is used, the same measurement must be performed, even internally.
Fig.14
Method to confirm the load cell connection
Items to be measured during confirmation of the load cell connection
Measurement
point
Item to be measured
Judging the voltage
EXC+
①
SEN+
②
Decrease in voltage on
the EXC+ side of the
load cell cable
Normally 100mV or less. However, it may
exceed 1V when an extremely long load
cell cable is used. For the 4-wire
configuration, it must be 0V.
EXC+
①
EXC-
④
Load cell excitation
voltage
If it is between 4.75 to 5.25V, it is normal.
SEN-
③
EXC-
④
Decrease in voltage on
the EXC- side of the
load cell cable
Normally 100mV or less. However, it may
exceed 1V when an extremely long load
cell cable is used. For the 4-wire
configuration, it must be 0V.
SIG-
⑥
EXC-
④
Center point voltage of
the load cell
Should be about 2.5 V, approximately half
of excitation voltage.
SIG+
⑤
SIG-
⑥
Output voltage of the
load cell
Compare with theoretical values obtained
from the load cell rated capacit, actural load
and excitation voltage.
Generally within 0 to 15mV.
mV
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