Re: Testing a transformer for shorted turns
I use the same method as Darius, but it's not portable.
I also sometimes put a 250 or 500 watt halogen lamp in series when testing primaries or even repairing switch mode supplies.
They make a great dynamic current limiter. If the current is low the element stays cool and therefore the resistance is low so there is little voltage drop. If there is a problem the lamp lights and there is no damage to the unit under test.
It's also a great replacement for a fuse if you are having problems tracing the cause of persistant fuse blowing but but cannot find any obvious shorts.
S.M
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