NCR 7870 manual Procedure 1 Increasing Load Test

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	Remove	Display
		Weight	Weight
1	9.995 kg	0.1 kg		0.1 ±	0.00 kg
	13.995 kg	0.1 kg		0.1 ±	0.00 kg
	30.0 lb.	0.2 lb.		0.2 ±	0.00 lb.
2	9.995 kg	2.5 kg	0.01 kg	2.5 ±	0.00 kg
	13.995 kg	2.5 kg	0.01 kg	2.5 ±	0.00 kg
	30.0 lb.	5.0 lb.	0.2 lb.	5.0 ±	0.00 lb.
3	9.995 kg	2.5 kg		5.0 ±	0.005 kg
	13.995 kg	4.5 kg		7.0 ±	0.005 kg
	30.0 lb.	5.0 lb.		10.0 ±	0.01 lb.
4	9.995 kg	2.5 kg		7.5 ±	0.005 kg
	13.995 kg	3.0 kg		10.0 ±	0.005 kg
	30.0 lb.	10.0 lb.		20.0 ±	0.01 lb.
5	9.995 kg	2.495 kg		9.995 ±		0.005 kg
	13.995 kg	3.995 kg		13.995 ±		0.005 kg
	30.0 lb.	10.0 lb.		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.