OHAUS DISCOVERY BALANCE, Руководство по обслуживанию

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CHAPTER 4 TESTING
4.2.5 Linearity Test
This test is used to determine the linearity of the unit throughout its operating range.
The masses used to perform this test can be utility masses.
NOTE:
The balance must pass the Off-Center Load Test and Repeatability Test before the
Linearity Test may be performed.
Loads do not have to be test masses. They can be anything that totals the mass value. The
test mass can be anything that weighs near the test mass value.
TABLE 4-1 DISCOVERY TEST MASSES
Capacity (g) Test Mass (g) Load 1 (g) Load 2 (g) Load 3 (g) Load 4 (g) Model (g)
110 20 20 40 60 80 DV114C
210 40 40 80 120 160 DV214C
310 60 60 120 180 240 DV314C
81/210 40 40 80 120 160 DV215CD
1. Place the test mass on the balance, record the weight and remove.
2. Place Load 1 on the balance and press TARE.
3. Place the test mass on the balance, record the weight and remove.
4. Place Load 2 on the balance and press TARE.
5. Place the test mass on the balance, record the weight and remove.
6. Place Load 3 on the balance and press TARE.
7. Place the test mass on the balance and record the weight.
8. Place Load 4 on the balance and press TARE.
9. Place the test mass on the balance, record the weight and remove.
10. The difference in the weights of the test mass should be within the tolerance
in Table 1-2. If not, perform an internal calibration (see Appendix A.1) and
repeat the test.
11. If the balance remains out of tolerance, the Load Cell may need to be repaired.
Discovery Balance Service Manual 4-5 Ohaus Corporation www.ohaus.com