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Originally Posted by Dakota
I'm surprised by this. As an engineer who uses calibrated test equipment every day in my job, I can't imagine using a piece of test equipment that remained uncalibrated for an arbitrary length of time. Perhaps where you worked, they had a set schedule for sending the units back to the factory for calibration, but an informal checking of accuracy with a tuning fork before / after each shift is NOT sufficient metrology to pass any kind of rigorous lab procedure, nor should it be sufficient for law enforcement purposes.
But, we are digressing here. No amount of calibration can overcome the proud papa phactor.
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Originally Posted by JMAELLIS
Radar units are "calibrated" by the factory in accordance with a recommended schedule, department policy and any relevant law.
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Not arbitrary. The units are sent in for calibration according the manufacturer's recommended schedule, department policy (which may be more frequent) and the law. Tuning forks are used to check the accuracy of the radar between calibrations (the forks also go in with the unit to verify their accuracy .. at least thats what we did .. can't speak for others.)