4-8
CHAPTER 4 TESTING
4.2.3 Linearity Test
The Linearity test is used to determine the span and linearity of the balance throughout its operating range and is in accordance
with the specifications listed in Tables 1-2, 1-3 and 1-4. The masses used to perform this test must meet or exceed ASTM
Class 1 Tolerance.
NOTE:
The balance must pass the Off-Center Load test before the Linearity Test
is performed.
This test is used to determine the linearity of the balance throughout its operating range.
Table 4-2 lists the suggested masses to be used for checking linearity on each balance model.
TABLE 4-2. CENTER LOAD TEST MASSES
ANALYTICAL PRECISION TOP LOADER
CAPACITY 62g 110g 210g 210/100g 210g 410g 410/100g 610g 2100g 4100g 4100/1000g 4100g 6100g 8100g
Ref. Mass 1g 1g 1g 1g/1g 1g 1g 1g 1g 1g 1g 1g 1g 1g 1g
Load 1 10g 10g 10g 10g/10g 10g 10g 10g/10g 10g 100g 1000g 1000g/10g 1000g 500g 1000g
Load 2 20g 25g 100g 20g/20g 50g 100g 50g/50g 200g 500g 1000g 1000g/100g 1000g 2000g 4000g
Load 3 40g 50g 150g 30g/30g 100g 200g 200g/75g 400g 1000g 2000g 2000g/200g 2000g 4000g 6000g
Load 4 50g 100g 200g 40g/40g 150g 400g 400g/100g 600g 2000g 4000g 4000g/500g 4000g 6000g 8000g
A 1g calibration mass is recommended for the reference mass. All masses are nominal values. HOWEVER, BE CERTAIN
TO USE THE SAME REFERENCE MASS THROUGHOUT THE PROCEDURE.
1. Perform a linearity calibration, see the calibration section of the instruction manual. ASTM Class 1 Masses must
be used for the calibration only. The test can be performed using utility masses.
2. Place the test mass on the pan and record the weight.
3. Remove the test mass and place Load 1 on the pan.
4. Zero the balance.
5. Place the test mass on the pan and record the weight.
6. Remove the test mass and place Load 2 on the pan.
7. Zero the balance.
8. Place the test mass on the pan and record the weight.
9. Remove the test mass and place Load 3 on the pan.
10.Zero the balance.
11.Place the test mass on the pan and record the weight.
12.Remove the test mass and place Load 4 on the pan
13. Zero the balance.
14. Place the test mass on the pan and record the weight.
15. All of the recorded weights must be within the tolerance of Table 4-1.
CAPACITY 12000g 22000g 32000g
Ref. Mass 1g 1g 1g
Load 1 2000g 4000g 6000g
Load 2 4000g 8000g 12000g
Load 3 8000g 16000g 22000g
Load 4 12000g 22000g 32000g
HIGH CAPACITY TOP LOADER
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