| Products > Test Equipment |
| Inside the new Korad KA3305P linear PSU |
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| torch:
Yes, it can supply either a maximum of 5A (5.1A actually, IIRC) at 62v when connected in series OR a maximum of 10A (10.2A) at 31v when connected in parallel. |
| Kleinstein:
You may not get the maximum voltage and maximum current from both channels at the same time, especially if the line voltage is at the low end. These cheap supplies are usually don't have filter caps that have much reserve to compensate for lower line voltage - adding more capacitance could also overload the transformer, so this is not a good idea. So just don't count of the full 5 A at 30 V, depending on the tolerances and line voltage it might be only 4 A at 30 V or 28 V at 5 A before ripple comes through. |
| SantaClaw:
It had no problem providing 10A dead short when in paralell |
| Kkkkkk:
Thx for the quick response. That's what I was asking for. Possible max voltage OR max current. The technical data sheet and the manuals from KOARD are really crappie :bullshit: I know running equipment on its upper limit is always gambling and you pray that Chinese work with safety margins, too. |
| torch:
--- Quote from: SantaClaw on January 24, 2016, 06:32:48 pm ---It had no problem providing 10A dead short when in paralell --- End quote --- Yes, but the voltage drops off to next-to-nothing with a dead short because the unit goes into constant current mode. I think Keinstein is making reference to possible voltage sag, wherein the voltage drops off before the unit starts limiting the current because the transformer just can't deliver the wattage. Especially likely if the line voltage going into the transformer is low. I did some testing when I bought this, first with a carbon pile (which did not have a fine enough adjustment for precision) then stringing together 100w (120v) light bulbs in parallel to provide a load. I forget the exact numbers, but I snuck up on 5 amps @ 60v by adding more and more bulbs until I was just shy with no voltage sag. Adding one more bulb triggered the CC mode, which throttles the voltage to limit the current. I neglected to draw anything from Channel 3 during the test, but the Korad can at least deliver full power through 2 of the 3 channels simultaneously. FWIW, when I asked the vendor, he replied the weak link would be failure of the cooling fan on the internal heatsink, but as long as the fan keeps going it can supply full power indefinitely. But then, taking a vendor's word could be like buying a used car from the guy who swears it was only driven by a little old lady to church on Sundays... :-\ |
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