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5-12 Chapter 5: Calibration
Procedure 1: Increasing Load Test
This test checks the scale’s accuracy by incrementally adding weight to
the center of the Top Plate. Use weights that correspond to the NCR
7870 weight feature. If this test fails, recalibrate scale.
Instructions
1.
Select the appropriate weight feature from the table below.
Step Weight Feature
Add
Weight
Remove
Weight
Display
1
9.995 kg
13.995 kg
30.0 lb.
0.1 kg
0.1 kg
0.2 lb.
0.1
±
0.00 kg
0.1
±
0.00 kg
0.2
±
0.00 lb.
2
9.995 kg
13.995 kg
30.0 lb.
2.5 kg
2.5 kg
5.0 lb.
0.01 kg
0.01 kg
0.2 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.
2.5 kg
4.5 kg
5.0 lb.
5.0
±
0.005 kg
7.0
±
0.005 kg
10.0
±
0.01 lb.
4
9.995 kg
13.995 kg
30.0 lb.
2.5 kg
3.0 kg
10.0 lb.
7.5
±
0.005 kg
10.0
±
0.005 kg
20.0
±
0.01 lb.
5
9.995 kg
13.995 kg
30.0 lb.
2.495 kg
3.995 kg
10.0 lb.
9.995
±
0.005 kg
13.995
±
0.005 kg
30.0
±
0.01 lb.
2.
Follow steps shown in table for the weight feature of your scale.
3.
Check readout after completing each step and verify the measured
value falls within the acceptable limits.
4.
If a measured value does not fall within limits, recalibrate scale. If
all measured values are acceptable, the scale has passed the
Increasing Load Test. Go to Procedure 2:
Over-Capacity Test
.
Note:
Do NOT remove any weights from the Top Plate.