Ohaus Corporation www.ohaus.com
18
Defender
™ Series Bases Service Manual
4.5.1 Off Center Load (Shift) Test
The Off Center Load (Shift) Test is made before and after a Base has had the Load Cell
replaced and adjustments have been made that affect its performance. The Off Center Load
Test verifies that all sections of the Base weigh within specified tolerance.
If the Base does not pass the Off Center Load Test, verify that the Overload Stops are properly
set. (See Section 3.1.)
If the Off Center Load Test cannot be passed, the Load Cell must be adjusted or replaced.
Prior to starting this test, the Base must be connected to a properly functioning Indicator, with
capacity and readability values set according to the specifications for the Base under test.
1. Place test weights equal to one third of the Base's capacity sequentially at each of the
positions A, B, C, and D, as shown in Figure 4-1. Note the Indicator reading at each
position. Base capacity, see Table 1-1.
2. Check the variation between mass weights and indicator reading against specified Shift
Tolerance ±4d for maintenance (±2d for the new product), For Base readability, see Table
4-3.)
Figure 4-1. Positions A, B, C and D are centered
at each quarter of the base platform.
A
B
C
D
