NCR 74 OFX (7874), User Manual

Page: 63 / 268

Chapter 3: Installation 3-21
After calibrating the scale, the accuracy must be verified to assure it meets the
government requirements. This consists of a series of four tests that must be run in the
continuous sequence given.
1. Increasing Load Test
2. Over ‐ Capacity Test
3. Decreasing Load Test
4. Shift Test
Increasing Load Test
This test checks the scale’s accuracy when incrementally adding weight to the center
of the Top Plate. Use weights that correspond to the RealScan 74 weight features.
24177
Step Weight Feature Add Weight Remove Weight Display Result
1
2
3
4
5
Kilogram 0.100 kg
Pound 0.20 lb
Pound
2.500 kg
5.00 lb
0.10 kg
0.20 lb
Pound
5.000 kg
5.00 lb
Pound
5.000 kg
10.00 lb
Pound
2.500 kg
10.00 lb
0.100 0.000 kg
+
0.20 0.00 lb
+
Kilogram
Kilogram
Kilogram
Kilogram
2.500 0.000 kg
+
5.00 0.00 lb
+
7.500 0.005 kg
+
10.00 0.01 lb
+
15.000 0.005 kg
+
12.500 0.005 kg
+
20.00 0.01 lb
+
30.00 0.01 lb
+
Note:
Do NOT remove any weight from the Top Plate between test steps unless
directed to do so.
Over-Capacity Test
This test checks for the proper indication from the scale when too much weight is
placed on the Top Plate.
Note: This test must immediately follow the Increasing Load Test; do not remove
any of the weights from the previous test prior to running this test.
Note: Scale capacity is 30 lb or 15 kg in 0.01 lb or 0.005 kg increments.