Unipulse F701-P, Operation Manual

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29
4 CALIBRATION
29
C
A
LI
B
R
A
TI
O
N
Chapter
4
(calibration error)
The initial dead load exceeds the zero adjustment range.
Connect a resistor of an appropriate value between the +EXC and -SIG terminals of the load cell,
shift the zero point, and then perform zero calibration again.
(calibration error)
The initial dead load is negative.
Check to see if the load cell is put under load in the correct direction and check the wiring of +SIG
and -SIG for reversal, and then perform zero calibration again.
For reference, relationships between connected resistance values and input
signals are listed below.
- The numerical values in this table assume that one 350-ohm load cell is used.
In the case where four load cells are connected in parallel, the sensitivity
decreases to 1/4; therefore, the resistance values should be considered as 1/4.
- The temperature coefficient of the resistance connected here directly affects
the accuracy of the indicator.
Use resistance of 50ppm/
℃
or higher (approx. 5 - 10ppm/
℃
recommended) at
least.
Resistance value Input conversion strain
Calculated value Approximate value μ-STRAIN mV/V
875 kΩ 866 kΩ
200 0.1
437 kΩ 442 kΩ
400 0.2
291 kΩ 294 kΩ
600 0.3
219 kΩ 221 kΩ
800 0.4
175 kΩ 174 kΩ
1000 0.5
146 kΩ 147 kΩ
1200 0.6
125 kΩ 124 kΩ
1400 0.7
109 kΩ 110 kΩ
1600 0.8
97 kΩ 97.6 kΩ
1800 0.9
87.3 kΩ 86.6 kΩ
2000 1.0
79.4 kΩ 78.7 kΩ
2200 1.1
72.7 kΩ 73.2 kΩ
2400 1.2
67.1 kΩ 66.5 kΩ
2600 1.3
62.3 kΩ 61.9 kΩ
2800 1.4
58.2 kΩ 57.6 kΩ
3000 1.5
54.5 kΩ 54.9 kΩ
3200 1.6
51.3 kΩ 51.1 kΩ
3400 1.7
48.4 kΩ 48.7 kΩ
3600 1.8
45.9 kΩ 46.4 kΩ
3800 1.9
43.6 kΩ 43.2 kΩ
4000 2.0
41.5 kΩ 41.2 kΩ
4200 2.1
39.6 kΩ 39.2 kΩ
4400 2.2
37.9 kΩ 38.3 kΩ
4600 2.3
36.3 kΩ 36.5 kΩ
4800 2.4
34.8 kΩ 34.8 kΩ
5000 2.5
Point