AD-4430B
- 43 -
7.5.
Verifying The Load Cell Connections Using Multimeter
The load cell connection can be checked easily using a digital multimeter.
“Illustration 12 Connection Check of Load Cell” shows points to confirm the load cell connection.
When a summing box is used, the same measurement must be performed, even internally.
7.5.1.
Check List Of The Load cell Connections
Measurement
points
Description
Conditions
EXC
+
SEN
+
Drop voltage of cable on
EXC
+
side.
Normally it is 100 mV or less. However, it may exceed
1V when an extremely long load cell cable is used. For
the 4
-
wire connection, it must be 0 V.
SEN
-
EXC
-
Drop voltage of cable on
EXC
-
side.
EXC
+
EXC
-
Input voltage
Normal range is between 4.75 V to 5.25 V.
SIG
-
EXC
-
Center point voltage
Approximately 2.5 V, about a half of excitation voltage.
SIG
+
SIG
-
Output voltage
Generally, it is within 0 V to 15 mV. The theoretical
value is calculated from the load cell rated capacity,
actual load and excitation voltage.
Output voltage of load cell
Center point voltage
Drop voltage between
EXC
-
and SEN
-
.
Input voltage of load cell
Drop voltage between
EXC
+
and SEN
+
.
Load cell
Shield cable
SIG-
EXC-
SEN-
SIG+
SEN+
EXC+
Illustration 12 Connection Check of Load Cell
