Posted by Bob M on November 17, 2009 at 09:05:48 from (151.190.254.108):
In Reply to: Electrical experts? posted by Dave H (MI) on November 17, 2009 at 07:53:46:
Dave - I’ve had one of those ammeters for many years but have not found it very useful.
While it is convenient it is NOT very accurate. Readings are highly affected by the presence of any nearby magnetic field – ie, a generator, alternator, motor, voltage regulator, etc. Even another current-carrying wire located nearby will screw up the reading. (I’ve found an operating alternator is the worst offender – just holding the meter a couple feet away from the alternator on my truck will cause it to read 60 amps or more)
So unless you can place it on a single wire several feet from any other electrical component its readings will be suspicious at best.
As for testing your meter a quick “yes no” test is to bring a small magnet near the meter housing. If the hand deflects as the magnet comes close it means the meter is working.
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