CHAPTER 4 TESTING
Ohaus Corporation www.ohaus.com
4-6
Ranger
™
(Count) 3000 Series Service Manual
5. Maximum allowable change in displayed weight readings for each of the four
positions can be found in Tables 1-1 (Specifications, page 1-2).
If this maximum is exceeded, follow procedures in Section 4.4.5, Adjusting Off
Center Load.
4.4.5 Adjusting Off Center Load
If the Off Center Load (OCL) is excessive, perform adjustment as follows:
A
B
C
D
Weighing Pan’s center
,
with points A
–
D indicated
2
3
1
4
Top view of Load Cell
Side view of Load Cell
Pan
Fixed end
2
1
4
3
Figure 4-1. Scale drawing of Ranger 3000/Ranger Count 3000 Load Cell and Weighing Pan.
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.
4. Move the weight to point B and record the reading.
5. Move the weight to point C and record the reading.
6. Move the weight to point D and record the reading.
7. If the reading at point A is negative, file at points 1 and 4 AT AN ANGLE.
8. If the reading at point B is negative, file at points 1 and 2 STRAIGHT ACROSS.
9. If the reading at point C is negative, file at points 2 and 3 AT AN ANGLE.
10. If the reading at point D is negative, file at points 3 and 4 STRAIGHT ACROSS.
Note:
It is not recommended that you try to adjust more than
–
5 counts if the beam has
been filed already. If the beam has not been filed previously, you can adjust
–
10 counts.
Remember, when filing you are weakening the beam. File a little at a time.
