Weighing Equipment Operation & Calibration Flashcards
7 cards from real CWT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Weighing Equipment Operation & Calibration flashcards as text
What is the primary purpose of the 'tare' function on a weighing instrument?
Answer: To subtract the weight of a container so only the net contents are displayed
The tare function offsets the display by the weight of an empty container, allowing the scale to show only the net weight of material added afterward.
When inspecting a load cell cable for potential errors, a technician should look for all of the following EXCEPT:
Answer: The cable color matching the platform color
Cable color has no bearing on performance; pinching, moisture ingress, and shield grounding are all real sources of signal error.
A legal-for-trade retail price-computing scale must display price-per-unit and total price. Under NIST Handbook 44, the computed price must be:
Answer: Accurate within the value of one minimum price increment
NIST HB 44 requires that computed prices not exceed the value of one minimum price division in error, protecting both buyer and seller.
Which action should a CWT technician take if a scale's as-found calibration data shows it was operating outside tolerance at the previous inspection interval?
Answer: Document the out-of-tolerance condition, assess impact on prior measurements, and report per applicable procedures
Out-of-tolerance as-found data triggers an impact assessment and nonconformance documentation to evaluate whether prior weighing results were affected.
What does OIML stand for in the context of weighing equipment standards?
Answer: Organisation Internationale de Métrologie Légale
OIML is the Organisation Internationale de Métrologie Légale, the intergovernmental body that issues international recommendations for legal metrology including weighing instruments.
A technician calibrates a scale using test weights that have not been recertified in five years. What metrology principle does this violate?
Answer: Traceability — calibration standards must be traceable to national standards through an unbroken chain with stated uncertainties
Metrological traceability requires that all reference standards used for calibration be periodically recertified and traceable to national or international measurement standards.
In a multi-range scale, when the applied load crosses the transition point into the higher range, what happens to the scale division (d)?
Answer: The scale division increases, reducing resolution in the higher range
Multi-range scales use finer divisions (smaller d) in lower ranges and coarser divisions (larger d) in higher ranges, trading resolution for extended capacity.