CMO Equipment Calibration & Diagnostics 3

Question 1

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:

Accepted Answer

Gain (span) error

Answer

When the error increases proportionally with the measured value rather than remaining constant, it indicates a gain or span error in the sensor.

Question 2

What is the recommended minimum ratio of reference instrument accuracy to the instrument under test during calibration?

Accepted Answer

4:1

Answer

The 4:1 accuracy ratio (also called the test uncertainty ratio) ensures the reference standard contributes minimal uncertainty to the calibration result.

Question 3

During a diagnostic cycle, the Mobilyze control unit displays an intermittent CAN bus communication error. The most likely cause is:

Accepted Answer

Loose or corroded connector on the CAN bus network

Answer

CAN bus communication errors are most commonly caused by physical layer issues such as loose connections, corrosion, or damaged wiring rather than calibration problems.

Question 4

After replacing a Mobilyze proximity sensor, the operator must perform which procedure before returning the equipment to service?

Accepted Answer

Functional calibration verification using a known reference position

Answer

Any sensor replacement requires a functional calibration check against a known reference to confirm the new sensor is correctly sensing position.

Question 5

Which diagnostic parameter indicates that a Mobilyze actuator is consuming more current than specified at a given load?

Accepted Answer

Current draw above rated amperage

Answer

Current draw exceeding the rated amperage at a specified load typically indicates internal friction, mechanical binding, or motor degradation.

(CMO) Certified Mobilyze Operator Practice Test

(CMO) Certified Mobilyze Operator Practice Test

CMO Equipment Calibration & Diagnostics 3