Chapter 8: Calibration
Shift Adjust
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8 Calibration
Shift Adjust
This adjustment should be made only after all mechanical parts are
checked, and the scale has proven repeatable. Repeatability is checked
by repeatedly placing a test weight on the same position of the platform
and checking for repeatable weight reading. Shift adjust is then done to
make the weight reading for each corner of the platform the same for the
same test weight.
The amount of test weight used for the shift test should equal 1/2 of the
rated scale capacity. Test weights should be concentrated at the center of
each quadrant of the scale platform.
Shift Adjustment for
Model 2158
The shift adjustment is made by adjusting load cell trim potentiometers
mounted on the junction box PCB.
1
2
3
4
LC 1 LC2
LC3 LC4
1/4 Scale Capcaity
Maximum Test Load
1
2
3
4
LC 1 LC2
LC3
LC4
1/2 Scale Capcaity
Maximum Test Load
OR
Figure 8-a: Test Load Recommendations
Note: The scale has been roughly shift
adjusted at the factory. Before
proceeding, check the shift
characteristics to determine if any shift
trimming is required. In a new
installation, shift adjustment to a
properly shimmed scale should be
minor.
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