OHAUS Adventurer Pro Balances, Service Manual

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4-5
CHAPTER 4 TESTING
.
4.2.3 Linearity Test (Cont.)
Test (Cont.)
5. Place the test load on the balance and record the weight.
6. Place Load 3 on the balance and press the ON/ZERO/ Off button.
7. Place the test load on the balance and record the weight.
8. Place Load 4 on the balance and press the ON/ZERO/
Off button.
9. Place the test load on the balance and record the weight.
10. The difference in the weights of the test mass should be within the tolerance in table 4.1 or
4-2. If not, perform a linearity calibration, see Appendix A and do the test again.
4.2.4 Load Cell Adjustments (Strain Gauge Models Only)
When the balance fails the Off-Center Load test and or the Linearity test, the Load Cell may require
checking and adjusting of the down stop and up stop. To make adjustments, the Load Cell Assembly
must be removed from the balance. Perform procedures 3.1.1, 3.1.5 for AV models and 3.2.1, 3.2.5 for
AS models and remove the Load Cell Assembly from the balance.
NOTE: These procedures will require feeler gauges ranging from 0.40mm/0.16in. to 0.65mm/0.026in.
Down Stop Adjustment
Checking and adjusting the down stop.
1. Place masses equaling mass 1 as indicated in Table 4-5 or 4-6 on the pan. You should still
be able to feel some movement with a slight downward push.
2. Place masses equaling mass 2 as indicated in Table 4-5 or 4-6 on the pan. You should feel
no movement with a slight downward push.
3. If the above conditions are not met , adjust the nuts and locktite when complete. See
Figure 4-3.
Figure 4-3. Load Cell End View - Adjustments
Up Stop
Adjustment Nut
Down Stop
Adjustment Nut
Down Stop
Adjustment Nut
Up Stop
Adjustment Nut