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
Which calibration interval strategy is based on analyzing historical out-of-tolerance rates to optimize the frequency of calibration?
Answer: Risk-based calibration interval optimization (RBCI)
Risk-based calibration interval optimization uses historical as-found data and failure analysis to adjust intervals — tightening them for unstable instruments and extending them for consistently in-tolerance ones.
A Mobilyze operator observes that a sensor's output noise level has increased significantly. Which diagnostic step should be performed first?
Answer: Check power supply voltage stability and grounding integrity
Increased noise often originates from unstable power supply voltage or poor grounding before the sensor itself fails, making electrical checks the logical first step.
What is 'measurement uncertainty' in a calibration context?
Answer: A quantified range within which the true value of the measured quantity is believed to lie
Measurement uncertainty is a statistical parameter that expresses the dispersion of values that could reasonably be attributed to the measurand.
During a Mobilyze hydraulic system diagnostic, pump output pressure is normal but actuator extension speed is below specification. The most likely cause is:
Answer: Internal actuator seal leakage bypassing fluid
When pump pressure is correct but actuator speed is slow, fluid is bypassing the actuator piston internally through worn or damaged seals rather than doing useful work.
What is the purpose of an 'as-left' record in calibration documentation?
Answer: To record the condition of the instrument after any adjustments have been made
The as-left record captures the instrument's final calibrated state after any adjustments, confirming it meets tolerance before being returned to service.
A Mobilyze operator notices a fault code indicating 'LVDT excitation failure.' What does this mean?
Answer: The linear variable differential transformer is not receiving its required AC supply voltage
An LVDT requires an AC excitation voltage to operate; an excitation failure means this supply is absent or out of specification, rendering the sensor inoperable.
Which practice ensures calibration results remain valid when a reference standard is sent out for external calibration?
Answer: Using a secondary transfer standard to maintain traceability until the primary standard returns
A secondary (transfer) standard, itself traceable and in calibration, bridges the gap so calibration work can continue with documented traceability.