Unipulse F159 User Manual

4.CALIBRATION
45
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.

Unipulse F159 Specifications

General

Brand	Unipulse
Model	F159
Category	Control Unit
Language	English