A condition trend is compared under different loads
A fictional technician compares a new vibration reading taken at a high production load with an older reading taken at low speed and light load. The larger number is labelled definitive bearing damage, although the measurement position, instrument settings and operating conditions differ. A colleague suggests replacing the machine immediately without further evidence. Another checks comparability, the manufacturer’s applicable criteria and additional supported observations before deciding which hypothesis merits investigation. This written exercise performs no measurement and sets no vibration limit. It asks the learner to distinguish an observation from a diagnosis, identify why a baseline can mislead and explain how an accountable condition assessment uses actual context rather than one isolated number.
1. Why is the numerical comparison insufficient?
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The measurements differ in operating and measurement conditions, so the change cannot be assigned uniquely to a bearing defect.
2. What evidence would improve the assessment?
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Use comparable documented measurement conditions, appropriate equipment criteria and corroborating observations, then investigate through authorized procedures rather than declare a universal threshold or immediate component diagnosis.