Fairbanks VSX SERIES TRUCK SCALE - Manual (Page 34)

04/12 34 51173 Rev. 8
Section 4: Calibration
INITIAL ZERO AND SPAN ADJUSTMENTS
1. Seat the suspension components.
2. Drive the test truck across the scale stopping and starting several times.
3. Repeat this procedure at least three times to assure that all parts are properly
seated.
4. The zero and span of the scale need not be set perfectly, but it should be roughly
adjusted to check for repeatability.
5. Return to zero to properly adjust the section readings.
6. Refer to the appropriate technical manual for the scale indicator for the initial and
span calibration procedures.
7. Perform the coarse initial and span adjustments.
8. Perform the final zero and span adjustments after adjusting the sections.
Repeatability and Return-to-Zero Performance Tests
1. Position the test truck in the center of the Weighbridge.
2. Note the weight reading.
3. Pull the truck off the scale and note the return to zero.
4. Repeat this procedure at least three times to assure consistency.
a. If the scale does not repeat the readings, within tolerance, check for
mechanical obstructions or “touches”.
b. Check the scale thoroughly for proper assembly
c. Check the load cells for proper alignment and to be certain it is plumb.
Note: This is best accomplished with the AZT disabled.