New Uni-t UDP4303S Powersupply - Page 1
Forum section: electronics / testgear

author: dexar
author_rank: Contributor
timestamp: September 14, 2024, 11:44:22 pm
content: Looks like UNI-T have released a new 4 channel power supply the UDP4303S. Looks like a big brother to the UDP3000S. And of course they choose black like everybody else.1uA resolution, sense on all four channels and 6V/10A on one of the channels is really tempting me.

author: ArcticGeek
author_rank: Regular Contributor
timestamp: September 16, 2024, 07:08:02 pm
content: I agree that this is a pretty nice power supply. It has a nice array of features and I love the new black appearance.In my opinion, Uni-T is the brand to watch in the upcoming future. Here in the USA, they now have a couple of dealers that sell some of their products (including Tequipment.net), and they also boast support for their products here in the US. I know lots of folks have complained about Uni-T's non-existent support, but it appears to me that they might be trying to turn that around.

author: dexar
author_rank: Contributor
timestamp: September 27, 2024, 09:51:54 pm
content: Seems like Tequipment has added them to the homepage so now we have a price at $1,399. I thought it would compete with Siglents SPD4000X or Hantek HDP4424 but it is almost double the money. Are they trying to escape the image of a low end brand?https://www.tequipment.net/UNI-T/UDP4303S/DC-Power-Supplies-/-Lab-Power-Supplies/

author: thm_w
author_rank: Super Contributor
timestamp: September 27, 2024, 10:42:04 pm
content: Quote from: dexar on September 27, 2024, 09:51:54 pmYes they are escaping the image, look at their latest signal generator, UTG9604T 600MHz $6,000.SPD4121X $780 for 285W. SPD4306X is $950 for 400W. UDP4303S 300W for $1400.But these are 1mA resolution. The uni-t is 1uA resolution display. So you are paying ~$500 more for 1uA and a few extra sense terminals. Enough to buy a dedicated 5.5 digit DMM.IMO they've overpriced it. But you can see how they could easily have justified the price, since there is nothing similar to it.

author: dexar
author_rank: Contributor
timestamp: September 28, 2024, 09:51:58 pm
content: The question is if they will offer firmware updates and it will perform as the datasheet promises. It feels like a gamble buying it in contrast with buying from one of the old reputable A brands which is the competitor with this price.

author: nctnico
author_rank: Super Contributor
timestamp: September 28, 2024, 10:44:46 pm
content: Quote from: thm_w on September 27, 2024, 10:42:04 pmThe PSU doesn't have a burden voltage, the 5.5 digit DMM does. If you have ever used a PSU with the ability to also accurately show small currents (up to tens of mA), you'll never want one which doesn't. However, I don't know the specs of this UNI-T PSU so I can't comment on how useful it is. The Keysight E36313 on my bench has 1uA resolution as well but accuracy is more in the ballpark of tens of uA (still not bad though).Quote from: dexar on September 28, 2024, 09:51:58 pmI don't want firmware updates. I want a piece of equipment which works right out of the box! The best test equipment you can own are those which don't need any firmware updates.

author: dexar
author_rank: Contributor
timestamp: September 29, 2024, 06:19:51 pm
content: QuoteHave you checked if you have the latest firmware for your Keysight E36313? I see on their homepage that there have been six released firmware updates.For me firmware updates is a way of showing that you support your product. I would never buy anything but the simplest equipment without seeing signs of that there will be updates when bugs are found.

author: thm_w
author_rank: Super Contributor
timestamp: October 01, 2024, 10:21:58 pm
content: Quote from: nctnico on September 28, 2024, 10:44:46 pmThe burden voltage is going to be minimal when you are measuring in the uA range... and if its an issue you use the sense leads.I don't disagree its better, I question if its worth that much to the average buyer here, who would be considering uni-t gear.

author: ArcticGeek
author_rank: Regular Contributor
timestamp: October 04, 2024, 04:27:35 pm
content: I agree that they overpriced this. At $1399 its getting into the "professional" gear category and trying to compete with the Keysight E363XX series. While it does have many of the same features as the Keysight, it will very difficult to compete against the brand recognition of Keysight and others. I'm not saying that will never be able to compete, but its going to take some time.The hobbyists and other folks like me likely will not spend that much money on Uni-T gear when you guy buy other power supplies for less than half that price; at least I can say that it puts it out of consideration for myself.I guess time will tell.Best,

author: DA-N-NY
author_rank: Newbie
timestamp: March 19, 2025, 11:26:58 pm
content: I think the UDP4303S stands out in two ways amongst the other players:1) High current output on the last channel i.e. 10A. I can easily suck 6A on a strip of WS2812s. Power supplies that can handle 8A or more on the 3rd or 4th channel are rare while still being able to supply 3A on the SP channels.2) Customizable OCP delay to ignore inrush current, especially the PS's own inrush. I have constant problems with my Rigol DP2031 nuance tripping the OCP at 500mA or under "without" a load connected. The Rigol supports the notion of an OCP delay but through SCPI only. It's not a first class citizen in the UI.