Laboratory Scale Test |
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U.S. Department of Agriculture |
Grain Inspection, Packers & Stockyards Administration |
Before proceeding with this test, review Chapter 2 of the Equipment Handbook. Clean, level, and balance the scale, before starting. Any test weights needed to determine accuracy must have a current Report of Test to Class F tolerances. |
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Scale make, model, and serial No.: |
Capacity x |
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division size (d): |
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Check mark the Class or Type of use, not both. A marked scale has a roman numeral II or III on the front or the i.d. plate. A marked scale is tested using either Class II or Class III tolerances, regardless of what it is used for. |
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Class II |
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Class III |
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No. of Div. |
Tol. |
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No. of Div. |
Tol. |
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Class II |
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0-5,000 |
1d |
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0-500 |
1d |
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Class III |
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5,001-20,000 |
2d |
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501-2,000 |
2d |
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20,001+ |
3d |
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2,001-4,000 |
3d |
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4,001+ |
5d |
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An unmarked scale is tested according to each type of its uses: Precision (and separations from work portions ≤ 100 g), Moisture (and separations from work portions > 100 g), and General (and separations from work portions > 500 g). |
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Type |
d |
Test Loads Required |
Tol. |
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Precision, etc. |
0.01 g |
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 50, 100 g |
0.02 g |
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Moisture, etc. |
0.1 |
above plus 150, 200, 250, 300, 400 g |
0.2 |
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General, etc. |
1 |
above plus 500, 600, 700, 1000, 1500 g |
1 |
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1. Class F weights used in this exam were last tested on this date (maximum 3 years) |
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2. Zero balance the scale before the sensitivity test, shift test and increasing load test. |
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3. Sensitivity Mechanical scales only. At zero, add weight equal to one scale division. The scale indicator should move to the top of the trig loop (or readings should change by at least one division). Repeat the test at the scale's maximum test load |
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1 |
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4. Shift Test Place weight of approx. 1/2 of the maximum test load (applied during the increasing load test) halfway between the center and the edge of each quadrant. Apply the basic tolerance for the type of scale and test load. |
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4 |
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2 |
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3 |
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Quadrant 1 |
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Quadrant 2 |
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Quadrant 3 |
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Quadrant 4 |
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1 |
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Reading |
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4 |
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2 |
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3 |
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5. Increasing Load For marked scales, test at each load from 1 g to 1500 g (or max. capacity) as indicated below. For unmarked scales test at each load indicated above, for each of the scale's uses. Evaluate the scale according |
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to the tolerances shown above for the type of scale tested. |
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Test Load |
Indication |
Test Load |
Indication |
Test Load |
Indication |
Test Load |
Indication |
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1g |
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7g |
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100g |
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500 |
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2 |
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8 |
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150 |
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600 |
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Test Load |
Indication |
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3 |
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9 |
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200 |
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700 |
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400 |
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4 |
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10 |
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250 |
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1000 |
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200 |
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5 |
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20 |
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300 |
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1500 |
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50 |
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6 |
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50 |
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400 |
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Test Load |
Indication |
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7. Balance Change. Record the maximum no-load indication during the above tests. Tolerance is 1d. |
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0 |
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Approved Disapproved |
Tested by: |
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Form FGIS-904 (1-02) (Previous editions are obsolete.) |
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Expires January 2015 |
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