Unipulse F805AT-CK Operation Manual page 110

Checker scale controller
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CAL. ERR. 2 (Calibration error)
Initial Dead Load is above Zero adjustment range.
Remove any excess load from loadcell or scale. If CAL.ERR.2 is still displayed, connect a resistor
between+EXC and -SIG. loadcell connections. This should shift the Zero point.
Do Zero Calibration again.
Ideal
875 kΩ
437 kΩ
291 kΩ
219 kΩ
175 kΩ
146 kΩ
125 kΩ
109 kΩ
97 kΩ
87.3 kΩ
79.4 kΩ
72.7 kΩ
67.1 kΩ
62.3 kΩ
58.2 kΩ
54.5 kΩ
51.3 kΩ
48.4 kΩ
45.9 kΩ
43.6 kΩ
41.5 kΩ
39.6 kΩ
37.9 kΩ
36.3 kΩ
34.8 kΩ
- This table is for a 350 ohm loadcell.
When 4 load cells are connected in parallel, the sensitivity decrease to 1/4. Be aware that the
resistance also decreases to 1/4 accordingly.
- The temperature coefficient of the connected resistor directly influences the accuracy of the
indicator. Use a resistor with a temperature coefficient below 50ppm.
+EXC
+SIG
-EXC
-SIG
Resistor
Approx.
866 kΩ
442 kΩ
294 kΩ
221 kΩ
174 kΩ
147 kΩ
124 kΩ
110 kΩ
97.6 kΩ
86.6 kΩ
78.7 kΩ
73.2 kΩ
66.5 kΩ
61.9 kΩ
57.6 kΩ
54.9 kΩ
51.1 kΩ
48.7 kΩ
46.4 kΩ
43.2 kΩ
41.2 kΩ
39.2 kΩ
38.3 kΩ
36.5 kΩ
34.8 kΩ
14.TROUBLE SHOOTING
Connect the resistor
between +EXC and -SIG.
Strain
μ-STRAIN
mV/V
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000
3200
3400
3600
3800
4000
4200
4400
4600
4800
5000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
99

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