Verification Test

Tests to Verify Scale Accuracy

Test	Description
Increasing Load Test	Verifies accurate weight measurement with increasing weights placed incrementally on the scale's platter, without returning weight to zero.
Over Capacity Test	Verifies that the correct indication appears on the Scale Display when the maximum weight is exceeded.
Decreasing Load Test	Verifies accurate weight measurement with decreasing weights removed incrementally from the scale's platter, without returning weight to zero.
Return to Zero Test	Verifies that the scale returns to zero when all weights are removed.
Shift Test	Verifies accurate weight measurement in all quadrants.

The verification tests listed in the following tables can be run in successive order. Use the appropriate table based on US (lb) or metric scales (kg) using applicable tolerance for single or dual interval scale models.

Verification Tests for US (lb) Scales

Verification Test for US Scale Applied Load lb		Indication = Applied Load Within Applicable Tolerances	All Tolerances Are +/-	All Tolerances Are +/-
			Acceptance Single Int	Acceptance Dual Int
Increasing Load Test
0.00		0.00	0.0 lb	0.0 lb
0.10		0.10	.005 lb	.0025 lb
5.00		5.00	.005 lb	.005 lb
10.00		10.00	.01 lb	.005 lb
20.00		20.00	.01 lb	.01 lb
30.00		30.00	.015 lb	.015 lb
Over Capacity Test
Over Capacity 30.20		EEEE	N/A	N/A
Decreasing Load Test
30.00		30.00	.015 lb	.015 lb
20.00		20.00	.01 lb	.01 lb
10.00		10.00	.01 lb	.005 lb
5.00		5.00	.005 lb	.005 lb
0.10		0.10	.005 lb	.0025 lb
Return to Zero Test
0.00		0.00	0.0 lb	0.0 lb
Shift Test (see Weight Positions on the Scale Platter).
10.00	Position 1	10.00	.01 lb	.005 lb
10.00	Position 2	10.00	.01 lb	.005 lb
10.00	Position 3	10.00	.01 lb	.005 lb
10.00	Position 4	10.00	.01 lb	.005 lb

Verification Tests for Metric Scale

Verification Test for Metric Scale Applied Load kg		Indication = Applied Load Within Applicable Tolerances	All Tolerances Are +/-	All Tolerances Are +/-
			Acceptance Single Int	Acceptance Dual Int
Increasing Load Test
0.000		0.000	0.0 kg	0.0 kg
0.100		0.100	.0025 kg	.001 kg
2.500		2.500	.0025 kg	.002 kg
5.000		5.000	.005 kg	.003 kg
10.000		10.000	.005 kb	.005 kg
15.000		15.000	.0075 kg	.0075 kg
Over Capacity Test
Over Capacity 15.100		EEEE	N/A	N/A
Decreasing Load Test
15.000		15.000	.0075 kg	.0075 kg
10.000		10.000	.005 kg	.005 kg
5.000		5.000	.005 kg	.003 kg
2.500		2.500	.0025 kg	.002 kg
0.100		0.100	.0025 kg	.001 kg
Return to Zero Test
0.000		0.000	0.0 kg	0.0 kg
Shift Test (see Weight Positions on the Scale Platter).
5.00	Position 1	5.000	.005 kg	.003 kg
5.00	Position 2	5.000	.005 kg	.003 kg
5.00	Position 3	5.000	.005 kg	.003 kg
5.00	Position 4	5.000	.005 kg	.003 kg

The weight checked at each position on the scale as shown below represents halfway between the center of the platter and corner. Use a stack configuration of weights if needed (for example, (2) 5.00 lb weights, or (2) 2.500 kg weights) depending on the units of measure programmed.

While performing a shift test, the indication of each position is within the applicable tolerance and the range of results obtained should not exceed twice the applicable tolerance.