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Inside the new Korad KA3305P linear PSU

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SantaClaw:
I wonder if I get the "new" version with the EU style banana terminals on the front... I did ask the seller if it came with the updated firmware for the M4 memory button issue, and they replied that all their stock had this update.

SantaClaw:

--- Quote from: TopLoser on December 08, 2015, 07:31:14 pm ---See the teardown above, that's exactly what the Tenma ones are. The dual channel ones are just two identical sets of boards in one case.

--- End quote ---

1 question though, I see that the Tenma does NOT come with a 110v/220v selector switch, what is it's voltage range ?

TopLoser:

--- Quote from: SantaClaw on December 09, 2015, 07:10:56 am ---
--- Quote from: TopLoser on December 08, 2015, 07:31:14 pm ---See the teardown above, that's exactly what the Tenma ones are. The dual channel ones are just two identical sets of boards in one case.

--- End quote ---

1 question though, I see that the Tenma does NOT come with a 110v/220v selector switch, what is it's voltage range ?

--- End quote ---

Google says 207v-253v

torch:

--- Quote from: pascal_sweden on December 07, 2015, 07:28:38 pm ---Is it better than or similar to the Siglent SPD3303X power supply?

--- End quote ---

Based on recent Siglent business practices, I'd say anything is better than theirs.

SantaClaw:
Well, It arrived today! Considering the shipping costs, I suppose I shouldn't really be surprised. Looks identical with the one torch got.
Fired it up, not forgetting to  swap over the 220/110V switch, it seems to be working just fine.
Came with TWO sets of banana/alligator leads, extremely slippery silicone/plastic protector on the alligator clips.

So, how do I feel it works? Well, it's down to what I have to measure it with.
lol, I've got a Uni-T (yeah, you can all stop laughing now.) UT81C scope meter, the top of the range scope meter from Uni-T.

According to it, (yes, I AM going to buy me a fluke 87, stop bugging me about the Uni-T)  it's as following:

Indicated: 5.00V on the psu, measured: 4.99-5.00V
Indicated: 31.00V on the psu, measured: 31.03V

Indicated: 0.01v on the psu, measured: 12.4mV(without REL 400mV range)  [0.012V 4V range]
Indicated: 0.01v on the psu, measured: 71.9mV [with REL 400mV range] [0.072V 4V range]

^So, that's why I don't really trust it all that much, and it IS a Uni-T lol^

How bout current?

Well, I hooked up an 56ohm (5%) resistor, because I had one.. lol

4V 0.5A current limit: Blew 500mA fuse on multi-meter... lol

Tried again: 4V 0.5A current limit, this time, on the A range on the multi-meter... lol
Indicated 4V, 0.066A on the psu, measured 0.071A on the meter 4A range.

5V 0.5A current limit:
Indicated 5V 0.084A Measured 0.089A 4a range.

Resistor is heating up :)

5.5V 0.5a current limit:
Indicated 5.50V 0.092A Measured 0.098A 4a range.

6V 0.5A current limit:
Indicated 6V 0.102A Measured 0.107A

Btw, Meter is indicating 0.000A when psu output is off.

I also shorted it out @ 31V 5.1A, and 0.001V 5.1A both channels no problems at all, fan spun up loud.

The only issue I have met, is that one time I powered it on, it turned on with the output on !!
I think it was because of the settings in the software? I've been unable to replicate it.

I set all the M buttons to 0.00V and 0.00A to be on the safe side. In case I hit one accidentally.. lol

So, the USB interface is working fine. Below is both the PSU interface(on the right) and the Meter interface (on the left)
As you can see, it's indicating 6V 0.102A on the psu, and 0.107A on the meter.



Note, update rate on the PSU is much higher then the gif will allow, similarly the update rate on the meter is set to 1sec, but you can get "instant" updating by disabling it.
Alos, the most noisy thing is the regulators for the fan, they keep buzzing, changing with the pitch of the fan...

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