Off-Center Load Test - OHAUS NV212 Service Manual

9. The difference in the weights of the test mass should be within the tolerance in Table 4-2. If
the differences are out of tolerance, calibrate (see Appendix A.1) and repeat the test.
10. If the Scale remains out of tolerance, the Load Cell may need to be replaced.

4.5.4 Off-Center Load Test

The Off-Center Load Test is used to determine whether displayed weight values are affected by
moving the sample to different areas of the Pan.
11. Place half of the scale's capacity in the center of the Pan.
7. Note the reading.
8. Move the mass halfway (between the center and the edge) to the front of the Pan. Note any
differences in the displayed weight reading.
9. Repeat the test for the back, left, and right position of the Pan.
10. Maximum allowable change in displayed weight readings for each of the four positions can
be found in Specifications Tables (Chapter 1). If this maximum is exceeded, follow
procedures in Section 4.5.5, Adjusting Off Center Load.
4.5.5 Adjusting Off Center Load
If the Off Center Load (OCL) is excessive, perform adjustment as follows:
Weighing Pan's
center, with points
A – D indicated
1. Place the test weight in the center of the Weighing Pan.
2. Tare the balance.
3. Move the weight to point A and record the reading.
Navigator Series Service Manual
Figure 4-4. Navigator Load Cell and Weighing Pan
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Top view of Load Cell
Side view of Load Cell
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CHAPTER 4 TESTING
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