CWT Measurement Standards & Accuracy 5

Question 1

What is 'span calibration' on an electronic scale?

Accepted Answer

Adjusting the scale's output to correctly indicate a known reference weight at full capacity

Answer

Span calibration adjusts the gain of the scale's signal processing so that a known reference weight produces the correct displayed reading.

Question 2

Which of the following best describes 'measurement uncertainty'?

Accepted Answer

A quantified range within which the true value of a measurement is expected to lie

Answer

Measurement uncertainty expresses the range of values that could reasonably be attributed to a measurand, reflecting all sources of error combined.

Question 3

A technician performs five consecutive weighings of the same 10 lb test weight and gets readings of 10.01, 9.99, 10.02, 10.00, and 10.01 lb. What does this data primarily assess?

Accepted Answer

Repeatability

Answer

Placing the same load multiple times and comparing results measures repeatability, also called reproducibility under the same conditions.

Question 4

Under NIST Handbook 44, a Class III scale with 5,000 divisions (n=5000) is classified based on which parameter?

Accepted Answer

The number of scale intervals between zero and maximum capacity

Answer

NIST HB 44 classifies scales by accuracy class (I–IIII) and the number of scale intervals (n), which equals max capacity divided by the scale interval value.

Question 5

What is the significance of 'Type Evaluation' (or 'type approval') for a commercial weighing device?

Accepted Answer

It certifies that a device design meets regulatory requirements for commercial use

Answer

Type evaluation confirms that a particular model design conforms to applicable standards, allowing that model to be legally used in commercial trade.

(CWT) Certified Weighing Technician Practice Test

(CWT) Certified Weighing Technician Practice Test

CWT Measurement Standards & Accuracy 5