KYOWA WGA-120A Instruction Manual page 57

[Example] Compensating the cable extension errors
Assume that a 350-ohm bridge resistance load cell is used with Kyowa's extension cable (0.5mm
cable resistivity (1.7×10
the no load applied, turn the Sensitivity adjuster all the way to the right to execute the balance
adjustment. Then, with an extension cable connected, execute the sensitivity adjustment by the CAL
to output 4 V when the CAL is 0.25mV/V. After the sensitivity adjustment, the WGA-120A outputs
5.00 V. To calculate the true output, remove the cable extension errors as follows.
Two-way cable resistance r (ohm) =
Correction value =
True output =
Calculate the load cell's true output by using the true output signal (voltage).
Load cell's true output =
=0.325 (mV/V)
-8
(ohm・m), 4-conductor shielded cabtyre cable of 100-m long. Then, with
2 × L × ρ
=6.8 (ohm)
r × A +1 = 6.8 × 0.0059 +1 = 1.0401
Measured value × Correction value = 5.00 × 1.0401 = 5.201 (V)
True output signal (V) × CAL (mV/V)
Output signal (V) after adding the CAL
6
× 10 =
S
-52-
-8
2 × 100 × 1.7 × 10
0.5
5.201×0.25
=
4
2
),
6
× 10