Equipment Calibration & Diagnostics Flashcards
7 cards from real CMO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Equipment Calibration & Diagnostics flashcards as text
A Mobilyze operator is calibrating a temperature sensor and finds the output is accurate at 32°F but reads 4°F low at 212°F. This error is best described as:
Answer: Gain (span) error
When the error increases proportionally with the measured value rather than remaining constant, it indicates a gain or span error in the sensor.
What is the recommended minimum ratio of reference instrument accuracy to the instrument under test during calibration?
Answer: 4:1
The 4:1 accuracy ratio (also called the test uncertainty ratio) ensures the reference standard contributes minimal uncertainty to the calibration result.
During a diagnostic cycle, the Mobilyze control unit displays an intermittent CAN bus communication error. The most likely cause is:
Answer: Loose or corroded connector on the CAN bus network
CAN bus communication errors are most commonly caused by physical layer issues such as loose connections, corrosion, or damaged wiring rather than calibration problems.
After replacing a Mobilyze proximity sensor, the operator must perform which procedure before returning the equipment to service?
Answer: Functional calibration verification using a known reference position
Any sensor replacement requires a functional calibration check against a known reference to confirm the new sensor is correctly sensing position.
Which diagnostic parameter indicates that a Mobilyze actuator is consuming more current than specified at a given load?
Answer: Current draw above rated amperage
Current draw exceeding the rated amperage at a specified load typically indicates internal friction, mechanical binding, or motor degradation.
The purpose of a 'dead-weight tester' in pressure calibration is to:
Answer: Provide a highly accurate reference pressure using known masses and piston area
A dead-weight tester uses calibrated masses on a known piston area (P = F/A) to generate precise, traceable reference pressures for calibrating gauges and transducers.
When documenting a calibration event for a Mobilyze instrument, which information is NOT typically required in the calibration record?
Answer: Operator's daily mileage log
The operator's mileage log is unrelated to calibration records; required data includes as-found/as-left readings, reference standards, and environmental conditions.