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Matrix MPS-3033X 3-channel 198W Isolated PSU - $299!?

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nctnico:

--- Quote from: radensb on November 29, 2022, 05:28:56 pm ---
--- Quote from: nctnico on November 29, 2022, 04:59:28 pm ---This looks to be a good option for somebody looking for a cheap lab PSU. Unlike Siglent's counterpart, it has a keypad, unlike Rigol's counterpart, it has isolated outputs. The readback accuracy isn't stellar though.

--- End quote ---
1mV/1mA is pretty standard as advanced features in other supplies in this price range.

--- End quote ---
That is the programming resolution. Readback accuracy is +/- 10mV / +/- 10mA so not stellar.

radensb:
Ah - yes. Sorry, I read that wrong.

radensb:
I received the Matrix MPS-3033X today. Taking after Dave, I didn't turn it on - instead, I took it apart! Well, somewhat.

PICS ATTACHED!

I have only been able to do some basic stuff, but here is what I found so far.

Pros:

* PWA's look like quality builds.
* Toroidal transformer has nice thick isolation.
* All wires are bundled and the ones near the case edges are in a protective sleeve
* The fans only spin up when needed. So far, I only briefly tested a short circuit condition on one of the the outputs and the noise was minimal.
* Accuracy is pretty good. CH1 was +3mV from the set voltage, CH2 was +1.5mV, and CH3 was bang on. Used 4V to test and will try with other voltages.
* Dial is also a push button that makes using it a bit simpler.
* So far, near identical software operation as a BK Precision.
Cons:

* From what I can tell, the large caps are YMIN brand? Never heard of them, but they are rated for 105C.
* Loud relays.
* Initial output enable ramp after power on looks pretty janky. Subsequent output enables looks cleaner, but still a small non-monotonic section. (supply set to 32V 3.2A connected to scope only). Can anyone comment on what this should look like? My BK Precision 9031B is cleaner, but also has a step ~2V so maybe this is a characteristic that is expected to some degree?
* Banana posts not standard spacing. Used 0.85" instead of 0.75" (really!? ...)
I know it isnt much of a checkout yet. Ill get a programmable load to really stress it out. Please let me know what testing and output I should do and capture! I know that Dave like the constant resistance 1Ω stress test. >:D



capt bullshot:

--- Quote from: radensb on December 06, 2022, 06:20:14 am ---
* So far, near identical software operation as a BK Precision.
--- End quote ---
This is as to be expected, since the BK Precision is just a rebrand of the same OEM model (itech IT6300: https://www.itechate.com/en/product/dc-power-supply/IT6300.html IIRC)


--- Quote ---Cons:

* From what I can tell, the large caps are YMIN brand? Never heard of them, but they are rated for 105C.
* Loud relays.
* Initial output enable ramp after power on looks pretty janky. Subsequent output enables looks cleaner, but still a small non-monotonic section. (supply set to 32V 3.2A connected to scope only). Can anyone comment on what this should look like? My BK Precision 9031B is cleaner, but also has a step ~2V so maybe this is a characteristic that is expected to some degree?
* Banana posts not standard spacing. Used 0.85" instead of 0.75" (really!? ...)
I know it isnt much of a checkout yet. Ill get a programmable load to really stress it out. Please let me know what testing and output I should do and capture! I know that Dave like the constant resistance 1Ω stress test. >:D





--- End quote ---

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