Weights and Testing

Certified calibration weights are designed to provide accurate results in accordance with strict standards. A truck scale should be calibrated with at least 12.5 percent of its nominal capacity or 25,000 pounds of certified test weights, which verifies that the scale is reading correctly.

Several tests will be performed at different areas of the scale, but it’s essential to see how the scale performs before adjustments begin. A scale technician will move a test cart across scale sections to record initial weight readings.

Corner, load cell and repeatability tests may also be done. Testing each load cell verifies that they function properly and that readings match the loaded value. Corner tests are similar in that they test the load cell, but they also verify that weight is distributed evenly across the scale. A repeatability test will be performed to see if the scale consistently reads the correct number of loaded weights.

Adjustments

After noting areas needing adjustment, the technician will fine-tune the scale at the junction box.

Verification

The cart of weights will be placed on the scale again to check for errors. If errors remain, the technician will repeat any needed adjustments. After correcting all errors, the final test is to weigh a vehicle and ensure the proper weight is displayed on the indicator.

Number of daily weighments

Number of days the
scale is used consecutively

Weather and environment

Materials weighed