Author Topic: Reasonable ripple in a PSU  (Read 1284 times)

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Offline StarFishPrime

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Reasonable ripple in a PSU
« on: March 07, 2014, 05:35:20 pm »
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
 

Offline Andy Watson

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Re: Reasonable ripple in a PSU
« Reply #1 on: March 07, 2014, 05:43:17 pm »
Manual says ripple should be 0.5mV or less. Probably wants its caps replacing.
 

Offline valentinc

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Re: Reasonable ripple in a PSU
« Reply #2 on: March 07, 2014, 07:18:15 pm »
      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...
Valentin
 

Offline StarFishPrime

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Re: Reasonable ripple in a PSU
« Reply #3 on: March 07, 2014, 07:21:10 pm »
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
 

Offline Andy Watson

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Re: Reasonable ripple in a PSU
« Reply #4 on: March 07, 2014, 07:30:04 pm »
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
 


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