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Inside the new Korad KA3305P linear PSU

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Salas:
You think 50HZ will be enough to show if the loop speed of the lab PSU is slow or decent enough though?

Salas:

--- Quote from: torch on September 05, 2015, 09:01:32 pm ---I'll see if I can figure something out.

--- End quote ---

  8) http://gpete.blogs.keysight.com/2012/03/building-electronic-load-with-general.html

wagon:
That looks similar to the 'Tenma' unit I bought from Element14 a couple of months back.  Mine looks like two 'single' supplies, side by side.  I don't think it has a USB interface.  It works OK, and can deliver the rated load (60V at 5A or 30V at 10A) for a reasonable time.  I should pull it apart for the giggles and look inside.

torch:
I found that five 100w "rough service" drop light bulbs in parallel draws 2.64A @ 62v indicated (PSU in series mode, 61.95v measured at the output terminals). I didn't have any luck using the IGBT as a switch (got the bulb output to oscillate slightly @ 1 hz) though.

No chance of overshoot with this load:





The ripple looks pretty bad in that shot, but that's just the screen resolution. Here's the ripple at the same load:


Those two bigger blips almost 200mV P-P about 8uS apart are regular and recurring.

torch:
Nevermind. Those blips must be EMF from something. They're everywhere, on both channels:







Even with everything but the scope shut off:



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