[sdiy] Testing a power supply

[Magnus Danielson]

Tom Bugs skrev:
> Hiya,
> 
> I just wondered whether anyone can recommend a tutorial or similar to 
> cover thorough testing of a linear PSU (based on LM317 / LM337)
> - basically, putting it through its paces and recording performance values.
> 
> I know how to hook up a dummy load using power resistors, but can't 
> think of much beyond that other than temperature -- what should I be 
> focusing on?
> 
> Any help much appreciated!

Variation of input voltage (usually power line voltage), check min, mean 
and max values.
Variation of load - check stability! (lack of oscillation)
Check over-current limitation and recovery from overcurrent (fuse or 
ducking, which ever is used).

A peculiar issue may be that certain impedances may cause it to 
oscillate unless due care is taken. Measuring source impedance can be 
interesting. As you load/unload the regulator, check for oscillations on 
scope.

Read up on power supplies in TAOE and you will realize what types of 
tests you would like to do.

Cheers,
Magnus