How would I go about testing a regulated power supply. 5-20vdc 2amp
an old lafayete model.

wrote:
How would I go about testing a regulated power supply. 5-20vdc 2amp
an old lafayete model.

Much depends on what you wish to use the power supply for. However,
try a 10 ohm 50 Watt resistor across its output and measure the D.C.
output voltage for purity from A.C. ripple and/or noise. A scope
would be nice here.

If you have the specs for this power supply, does it conform to your
expectations? Maybe some of its caps have aged and require
replacement?

--
1PW

"1PW" "OneNpOeSnPuAtMwhistle att a0l dot calm" wrote in message
. ..
wrote:
How would I go about testing a regulated power supply. 5-20vdc 2amp
an old lafayete model.

Much depends on what you wish to use the power supply for. However,
try a 10 ohm 50 Watt resistor across its output and measure the D.C.
output voltage for purity from A.C. ripple and/or noise. A scope
would be nice here.

If you have the specs for this power supply, does it conform to your
expectations? Maybe some of its caps have aged and require
replacement?

--
1PW

A 24v truck headlamp bulb or two is a good test load for this sort of thing.
You can put just one on the end and sweep the supply from 5 to 20v whilst
monitoring the output for voltage (make sure that it goes as far as it did
with no load) and for ripple ('scope useful here, but low AC voltage range
on a multimeter will do), then set back to half way - say 10v - then put a
second bulb across the output to double the load, and make sure that the
output voltage does not drop by more than a few mV. At the midway point of
10v, I would not expect the output voltage to change more than say 100mV on
a halfway decent supply that was working correctly. On a good quality
supply, it will be a whole order better than that.

Arfa

wrote:
How would I go about testing a regulated power supply. 5-20vdc 2amp
an old lafayete model.

How about providing a less open-ended question. Some details would be
nice. Otherwise you may get answers like:
To test the dimensions, use a ruler.
To test the weight, use a scale.
To test the voltage, use a voltmeter.

I'm impressed that you got two good answers already!