CST Scale Installation & Calibration Procedures 2

Question 1

When installing a floor scale in a high-traffic forklift area, which foundation requirement is most critical?

Accepted Answer

Reinforced concrete rated for the scale's capacity plus dynamic load factors

Answer

Forklift dynamic loads can exceed static ratings significantly, so the foundation must be engineered for both the scale capacity and impact loads.

Question 2

A load cell outputs 2.0003 mV/V at full rated load. The nominal specification is 2.0000 mV/V. What is the sensitivity error?

Accepted Answer

0.015%

Answer

Sensitivity error = (2.0003 - 2.0000) / 2.0000 × 100% = 0.015%.

Question 3

Which NIST Handbook 44 requirement governs the minimum number of test weights needed for a complete calibration of a commercial scale?

Accepted Answer

Test loads must cover at least the minimum graduated value up to maximum capacity

Answer

HB44 requires that test loads used span from the minimum test load through maximum capacity to verify accuracy across the full range.

Question 4

During a cornerload test on a 4-load-cell platform scale, one corner reads 2 lb high when 100 lb is placed directly over it. The most likely cause is:

Accepted Answer

That load cell has a higher sensitivity than the others

Answer

Corner errors on individual cells most often indicate sensitivity mismatch; trimming resistors adjust for this once mechanical causes are ruled out.

Question 5

What is the purpose of a 'soak test' performed after scale installation?

Accepted Answer

To allow the scale to reach thermal equilibrium and structural settling before final calibration

Answer

A soak test lets the scale stabilize thermally and mechanically so that initial calibration readings are not skewed by transient conditions.

(CST) Certified Scale Technicians Practice Test

(CST) Certified Scale Technicians Practice Test

CST Scale Installation & Calibration Procedures 2