Check the accuracy of the voltage and current settings. Check the CV and CC compliance functioning. Check the output ripple level.
jspencerg
Startup transients, output ripple ... ?
galileo_rs
You can also use the arrow buttons to move the number setting position.
The unit that was shipped to me didn't get checked before shipping... Both the positive and negative output wires were left in soldered to the circuit board. When i removed the cover the red wire was floating in the air. The black wire was stuck in the hole but not soldered. After I soldered the wires in their holes the unit works.
RogueOntheRoad
For Ham radio applications, does it emit any RF noise?
bobkozlarekwasqq
I like these small power supplies very much and they are getting better version by version. The last 3 of them are on the bench and used for drilling machines soldering irons and normal power supplies. They might not be perfect regarding noise when testing sensitive electronics but a passive filter can be added as self made adapter.
Manf-ftzk
“We need a bigger boat”… I just had cola shoot out of nose thanks to that Jaws ref. Nice!!!LOL!
TheElectronicDilettante
Do the banana jacks have holes for sticking in bare wires? Is the USB port isolated?
erikr
Thank you for reviewing this. I didn't purchase the Supply but did order that big resistor and a huge Rheostat 200w 5 Ohm for doing these type test.
I enjoy doing these type test.
jjqformerlyjailbreak
At the start of the video, I was going to comment that 40V, 20A would be 800W and that thing didn't look big enough to handle it. Nice to see the clarification of the 300W max at the end.
leonerduk
Biggest item on the display is "DC" 🤯
thomasstran
But what is the output noise like? And transient response like? Like does it overshoot and how does it regulate during load transients? How long to get back under control?
soothcoder
That separate 5v switcher is for your USB output but it may also run the display.
jjqformerlyjailbreak
Here in Europe we use 'U' for 'voltage'. Guess that's why it's labelled 'U/I'?
LostAgain
I saw a ground lead going from the heat sink to the front panel, but there is no ground on the front panel.
Is the AC ground tied to Neg output or something?
idahobob
Like to see output ripple with that 1R resistor, and also low current ripple, likely to be not too bad, though the constant current is very likely to have some rather nasty transient peaks, with all that output capacitance, and current limiting might not save your DUT if it has an accident, those capacitors will deliver some brutal spike before the control loop can drop it back down. But not at all a bad looking unit, though it looks like the software and USB is just a CH340 serial interface, wonder just how janky the software is, and what the command set is like for it.
USB output a good extra, plenty of times you need a 5V supply, though as it is part of the control loop, they probably share a common ground, and that can be an issue. Should have provided a separate isolated USB power, an extra few cents to add the extra wire, the diode and the capacitor, and then instead have had it separate, with at least 250VDC isolation, so that you can use other USB powered test equipment with it, or included a small USB C full function supply, or at least one capable of doing negotiation up to 30W instead, so you can run more modern test equipment as well off a single mains connection. Plenty of space in that cabinet to have added that extra board, and fed off the existing aux supply rectifier and capacitor for primary, or off the main board 340V supply rails.
SeanBZA
I wish you had tested its output noise as such SMPS's are known to produce horrible noise that make them almost useless for analog circuits...
RasoulMojtahedzadeh
This is interesting, thanks. Have you tested the RF ripple coming out of the PS when loaded? This may be of significance when testing sensitive RF.
henrikstenlund
I know that some people like the safety ground going to the case, so does most of the regulations for electrical safety. 🙂
TheEmbeddedHobbyist
CC stands for constant current, not current compliance? Right? I don’t like that it’s not obvious that the output is on. Should be a separate light. Or maybe a lighted output button. Buttons and knobs are too squished together. I like a horizontal power supply better than these vertical ones.
jimomertz
I will consider getting one for Ham use bench testing thanks for saving me the trouble on deciding thanks Mike wb7qxu
