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.... always engage brain and make absolutely sure you know exactly what you are intending to measure before applying the test probes.
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Seconded.
Some years ago I was checking an amplifier's transformer for continuity. When that was OK, I switched on to measure the a/c out (and mains in) of the said transformer. Yes, the step I missed was to change the multimeter to 300v a/c before applying the probes.
Oh well it was only a cheap meter. I wouldn't mind, but I did exactly the same the following day... with an old avo meter.
My rule since is to check twice measure once as opposed to in woodworking where you measure twice and cut once.
Stuart.