ADV Service Manual P/N 83020790 A
Ohaus Corporation
www.ohaus.com
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5B. An error in the Off-Center Load Adjustment can affect the results of the Precision Test. Inspect and
correct if necessary. See Off-Center Load Test.
4.2.3.2 Off-Center Load Test - Precision Balances
The Off-Center Load Test is used to determine whether displayed weight values will be affected by moving the
sample to different areas of the Platform. See figure 4-2. Place 1/2 of the balance capacity in the center of the
Platform. Press the
button to return the reading to zero. Move the mass halfway to the rear of the
Platform and note the reading. Move the mass halfway between the center and the left edge front of the Platform
and note the reading. Repeat this test for the right edge position and note the reading. Move the mass halfway to
the front of the Platform and note the reading. Note any differences in the displayed weight reading at all positions.
Maximum allowable change is per Table 4-2 for each of the listed balances four positions.
Figure 4-2 Off-Center Load Test Mass Locations
To correct an off-center load error, proceed as follows:
Transducer Adjustment
This adjustment requires that the balance Top Cover be removed and the Transducer Shield removed to gain
access to the Transducer for adjustments. Refer to Figures 4-4 and 5-1 for location of components called out in
this procedure.
NOTE:
The top cover connector plug may be used to turn the balance on. The pins are numbered from 5 - 1
starting at the left. Shorting pins 5 and 1 turns the unit on and tares. Shorting pins 4 and 1 turns the unit off.
See Figure 4-7, page 4-14 for pin connections.
1. Refer to paragraph 4.3.1, page 4-10 and open the balance.