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5-14 Chapter 5: Calibration
Procedure 3: Decreasing Load Test
This test checks the scale’s accuracy when incrementally removing
weight from the Top Plate. Use weights that correspond to the NCR
7870 weight feature. If a failure occurs during this test, you must
calibrate the scale again.
Note: This test must immediately follow the Over-Capacity Test; do
not remove any of the weights prior to running this test.
Instructions
1.
Select appropriate Weight Feature for your Scanner/Scale.
2.
Follow the four steps shown in chart.
Step Weight Feature Add
Weight
Remove Weight Display
1 9.995 kg
13.995 kg
30.0 lb.
2.495 kg
3.995 kg
10.0 lb.
7.5 ± 0.005 kg
10.0 ± 0.005 kg
20.0 ± 0.01 lb.
2 9.995 kg
13.995 kg
30.0 lb.
5.0 kg
7.5 kg
15.0 lb.
2.5 ± 0.00 kg
2.5 ± 0.00 kg
5.0 ± 0.00 lb.
3 9.995 kg
13.995 kg
30.0 lb.
0.1 kg
0.1 kg
0.2 lb.
2.5 kg
2.5 kg
5.0 lb.
0.1 ± 0.00 kg
0.1 ± 0.00 kg
0.2 ± 0.00 lb.
4 9.995 kg
13.995 kg
30.0 lb.
0.1 kg
0.1 kg
0.2 lb.
0.0 ± 0.00 kg
0.0 ± 0.00 kg
0.0 ± 0.00 lb.
4.
If display does not read within limits shown, the scale has failed
and must be recalibrated.
5.
If the displayed measurements fall with the acceptable limits, the
scale has passed. Go to Procedure 4:
Shift Test