
AD-4408C Weighing Indicator Page 56
10.4. Checking the Load Cell Connection Using the Digital Multimeter
Using the digital multimeter, load cell connection can be checked easily.
The figure below indicates the measurement points to check the connection.
When a summing box is used, the same measurements are required inside the box.
Fig.15 Checking the load cell connection
Checking the load cell connection
Measurement point What to measure How to judge
EXC+
1
SEN+
2
Voltage drop at
EXC+ of the load
cell cable
Normally less than 100mV.
Can exceed 1V when the load cell cable is
extremely long.
Should be 0V for 4-wire connection.
EXC+
1
EXC-
4
Load cell excitation
voltage
Correct value: 4.75 to 5.25V
SEN-
3
EXC-
4
Voltage drop at
EXC- of the load cell
cable
Normally less than 100mV.
Can exceed 1V when the load cell cable is
extremely long.
Should be 0V for 4-wire connection.
SIG-
6
EXC-
4
Load cell median
voltage
About 2.5V (half of the excitation voltage)
SIG+
5
SIG-
6
Load cell output
voltage
Compared with the theoretical value
obtained from the load cell rating, actual
load and excitation voltage.
Normally 0 to 15mV.
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