Reasonable ripple in a PSU

[StarFishPrime]

Hi

I've recent purchased an old Coutant LQT100 dual 0-30V psu and have been testing it under different loads. The output PD seems stable when changing load and over time. At 5V & 10V I am seeing approx 120mV peak-peak ripple regardless of load. Does this seem reasonable to you for a psu for home use?

Cheers

Ian

[Andy Watson]

Manual says ripple should be 0.5mV or less. Probably wants its caps replacing.

[valentinc]

      Giving the fact that it's a linear power supply, it's ripple must be in the order of a few milivolts... 100 mVpp is a ripple for a crappy switchmode power supply...

[StarFishPrime]

Thanks for the advice. The larger caps are large cans some 5cm x 2cm which I presume are film?..  Apart from the specs is there a particular type that people would recommend?

Cheers

ian

[Andy Watson]

It will be the larger, electrolytic caps that need replacing. I assume you've found this:
http://elektrotanya.com/coutant_lqt100_lqt200.zip/download.html