NCR 7870 manual Procedure 2 Over-Capacity Test

Chapter 5: Calibration 5-13

Procedure 2: Over-Capacity Test

This test checks for the proper indication from the scale when too much weight is placed on the Top Plate. An over-capacity is indicated by dashes appearing on the display. If a failure occurs during this test, the scale must be recalibrated.

Note: This test must immediately follow the Increasing Load Test. Do not remove any of the weights prior to running this test.

Instructions

1.Use the following chart to select the correct weight.

2.Follow steps on chart for adding and removing weights. Weight must be placed in center of Top Plate.

Step	Weight Feature	Add	Remove	Display
		Weight	Weight
1	9.995 kg	0.04 kg		- -.- -
	13.995 kg	0.04 kg		- -.- -
	30.0 lb.	0.08 lb.		- -.- -
2	9.995 kg		0.04 kg	9.995 ±	0.005 kg
	13.995 kg		0.04 kg	13.995 ±	0.005 kg
	30.0 lb.		0.08 lb.	30.0 ± 0.01 lb.

3.If a series of dashes are not shown, then the scale has failed and must be recalibrated.

4.The scale passes the test if a series of dashes is displayed and all

measured values fall within the acceptable limits Continue to Procedure 3: Decreasing Load Test