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Unipulse F159 - Page 108

Unipulse F159
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9.ERROR CODE
99
Calibration Error 2
Initial dead load exceeds the zero adjustable range of the F159. Check if the cell
is loaded with any extra object.
If the Calibration Error 2 persists while the system is loaded correctly, Zero
calibration must be performed again after inserting a resistor between +EXC and
–SIG terminals of the load cell for shifting zero point. The relation between input
signal shift and resistor values are summarized in the table below.
The values contained in the table assume single 350Ω load cell configuration.
Temperature coefficient of the resistor directly affect reading accuracy. Use
resistor with temperature coefficient better than 50ppm/ (5ppm/ class
recommended)
Resistor Voltage shift equivalent strain
Calculated
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
Insert a resistor
+EXC
+SIG
-EXC
-SIG
between +EXC and –SIG.

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