Fairbanks MATRIX SCALE HIGHWAY SCALE SYSTEM - Manual (Page 35)

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Section 5: Calibration
PRELIMINARY CHECKS
• Seat the suspension components. Drive the test truck across the scale stopping
and starting several times across the scale. Repeat this procedure at least three
times to assure that all parts are properly seated.
• Refer to the appropriate technical manual for the particular Intalogix ™
Technology
Indicator for the setup and calibration procedures.
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.
5. If the scale does not repeat the readings (within tolerance), check for mechanical
obstructions or binds.
─
Check the scale thoroughly for proper assembly.
─
Check to see the load cells are properly aligned, level, and the load is equally
distributed on each load cell.
─
Add or remove shims as required to improve deadload distribution.
SECTION TEST AND ADJUSTMENTS
1. Test the section by centering the test load over each section.
─
A weight cart, block weights, rear axles of the test truck.
2. Note the weight indication of each section.
─
Adjusted each section so the weight indications match within the tolerances
set forth by the
National Institute of Standards and Technology's
Handbook H-44 .
3. Trim the sections by placing the test load over each section, and then adjusting it
as described in the appropriate Intalogix™ instrument service manual.
DIGITAL INDICATOR SPAN CALIBRATION
• Perform the span adjustments, following the appropriate Intalogix
™
Instrument service manual.