Discussion
Consider the following statements about reading out a recovered recorder:
1. The physical condition of the memory module is assessed before power is applied.
2. A module recovered from sea water is cleaned and dried first.
3. A wrong conversion factor produces an obviously nonsensical trace.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
The first two describe the readout procedure correctly: the module's physical condition is assessed before any power is applied, and a module from sea water is cleaned and dried first.
The third is the reason validation is needed rather than a fact. A wrong conversion factor usually gives a plausible trace - a gain error scales it, an offset shifts it - which is exactly why the readout must be anchored to independently known events.
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