Rice Lake SURVIVOR ATV - Manual (Page 18)

12 ATV Portable Truck Scale Assembly Instructions
4. As a final verification of the load cell trimming, do a final corner check. Place a 1000 lb weight on one
corner of the platform and record the raw-count reading on the indicator. Move the weight to all of the
other corners in turn and record those readings. The readings should be within .1% of each other.
4.4 Calibrating with Test Weights
The calibration procedure can only be done after all trimming as described above has been completed. A qualified
scale technician with a test weight truck and the expertise to access the scale indicator’s setup or calibration mode
must perform the calibration procedure.
1 4 3 2
8 5 6 7
Figure 4-6. Calibration with Test Weights
Equipment Required
Truck scales are routinely calibrated using 25% of the capacity weight of the scale. Certified Class F test weights
equaling at least 12.5% of the scale’s capacity are required for calibrating a commercial legal-for-trade truck scale.
In addition, some type of weight for a substitution test of an additional 12.5% of the capacity is required. This can
be the test-weight truck, bags of sand, or any convenient items easy to load onto the scale. This total calibration
weight of 25% of scale capacity (12.5% test weights, 12.5% substitution weight) is required by weights and
measures officials for commercial truck scales in most states. Check with your local weights and measures officials
for the requirements in your jurisdiction.
Industrial scales not used for legal-for-trade transactions do not require certified test weights. Weight equal to 25%
of scale capacity is recommended for calibrating such scales.
See NIST Handbook 44 for detailed calibration requirements and procedures.