Nice device Tony, I have a slightly worse UNI-T UTP3305-II, but it's good enough for me and I'm happy with it. Thanks for the video and may it serve you for many years.
Hard to believe the price for this much power. I was sure had to at least be a switcher. Some turn-on and current limit waveforms would be interesting. Nice video, thanks.
Thanks! yes it is indeed linear, and good. if you want indepth.. on EEVblog. look for this device and find a guy called Phil .he posted some real good indepth tests there.
Thank you, Tony. Another comprehensive review - much appreciated. Nice looking unit and the zoom feature is a great idea! It is a shame the software doesn't detect the NI-VISA drivers correctly, overwriting the new version with an older one can really cause problems. It looks like there is a USB port on the front panel as well as the rear panel. Regards, David
Thank you David, well spotted on the USB.. The front one is the 4th channel and can be used for charging. in the back is for storage/firmware update. yes the VISA installation was silly. maybe the VISA itself is smart enough not to install over a newer version, i i don't want to try that.... i make a weekly image of the PC.. when it is realy wrong i just restore it :)
Thanks for sharing your review. Apart from the little hick-up with the driver install, this otherwise seems to be a great PSU. Hope the ripple will be small. I actually have ordered the UNI-T 3305S-E from Eleshop today for myself :) as I like to get rid off my several small and cheap-ass PSUs of which I have 4 or 5 devices flying around my lab. I also have the big Aim TTi PL303 QMT-P a full-blown triple PSU which has only knobs to adjust voltage/amps "freestyle". It is my most precise and expensive PSU indeed, but nothing to quickly carry from one workbench to the other when I am working on my different projects ... so, the UNI-T will complement my equipment properly. I very much like the possibility to enter numbers directly on the number key pad of the UNI-T. I have also the Siglent PSU since 3 years or so, where you always need the arrow keys (fine) to change position digits left or right and the knob to adjust and change voltages/amps values for that selected digit - still feels odd. Typing just the number + enter is pretty convenient ;) The Zoom mode of the UNI-T comes in very handy for having visually bigger numbers to better see. Like that! I also love the fact when either in serial or parallel mode, the display always shows the total voltage/amps. This is so weird with my Singlent PSU (as you showed also) where you just see "half" of the voltage or amps in the display when coupling the channels. However, the Siglent did a fantasctic job so far on my work bench, but this new Unit-T device will be doing alike as good on my other workbench ;) ...
Hi Markus, Your TTi wow! good stuff. Same for me about the Siglent, mine i don't use, becouse the 2 arrow buttons ans used to change from A to V and the single [fine] is used to jump digits.. What?? Yes.. stupid . meens every time you need the change voltage you are puching at least 5 time the fine button. while they had the arrows available.. and the [fine] could be used to change from V to A .. thats why i was looking at this one.
@@TonyAlbus Totally agree. I am using my Siglent just with most relevant "fixed" voltages for channel 1 (5V) and channel 2 (12V) and use the 3rd channel with 3.3V. I does not change the values often on this device because of the reason you explained. But the built quality, the software, voltage precision, noise level is all decent and good enough for my applications, also has enough power for me. But the UNI-T will be more versatile and comes with a few cool features. Really looking forward playing with that "big boy" during next few days ... :)
@@markuskeller9734 Yes i must agree also, aside form the controls, is a great form factor, good build quality, stable, low rimple.. it wil be a great 2nd with the fixed values as you did. and have fun with the UNI-T
Nice review. I agree with your impressions. Just need GPIB and four-wire sensing. It would be nice to measure its ripple. I'm still happy with my old PS2521G.
Nice Tony....I only have one device from this company...it was High voltage meter, i use to test our x ray units high tension cables, i did not know that grew so fast to have all sort of devices now....i was honestly looking to buy the 4 channels INSTEK power supply ...hmmm
Interesting unit for sure. But when you put it in seriel mode, as in 30 + 30 volts, do you then have access to the midpoint, so you can get -30 - ground - +30 volts out of it? To drive something that needs both negative and positive voltage.
@@GeorgePapadopoulos11 Yes the procidure is in the zip file. but : format usb-stick FAT32 use 8 or 16 gb i would advice.. not to big. copy firmware file in root, do not rename switch off device, usb in the back, hold [UTILITY] and switch on, wait for process to finisch.
@@TonyAlbusOk I upgraded the firmware to 1.10,it was very easy. Now it’s much better with all the functions like yours plus it is faster. Thank you for the support Tony.
Any chance showing the world the internals ? There is no teardown video so far (1/2024). I am very interested because I can't decide between this one and Rigol DP832.
Hello! What does the UDP3305S-E do if a voltage higher than that specified in its settings is applied to its input? Does it stop stabilizing or tend to absorb energy? That is, does it switch in electronic load mode or not? I'm used to the HP-AGILENT 6632, which tries to stabilize the current and voltage even if its source is not itself, that is, it switches to electronic load mode, which more closely imitates a chemical source, but without internal resistance.
Heloo Tony. Perhaps it would be good to show how a multi-channel laboratory power supply can be connected as a balanced supply (+12V) : 0 ground : (-12V). Connecting two channels in series does not seem to create a zero point for the positive and negative voltages. I believe that this is possible by connecting (A-) and (B+) separate channels and thus creating a zero potential for both the positive and negative voltage branches. It is good to connect the zero contact to ground (in both channels of the source). It would be good to have a short video on how to connect it and how it works. There are several videos on RUclips about wiring two separate sources as symmetrical. I think that both separate channels of one source should work exactly the same.
To that symmetrical voltage on multi-channel laboratory sources. Probably the most important thing is to measure with a multimeter whether the two optional channels are connected via the (-) connector. If the channels are separated (separate or floating) it is quite easy, But for some, a video on how to connect it can be inspiring, because such a resource not costs a little money and no one wants to destroy it. In addition, the question is whether the central (zero) output should be connected to the ground (usually a green connector) or whether only a "floating" ground without grounding is sufficient. If someone invests in a good lab resource, they should be able to take advantage of its capabilities. A lot of my friends have a three-channel power supply and she made a small symmetrical one with LM317T and LM337T anyway because she didn't know that it can be set even on a large power supply.
Thank you 😉 i have eye on the Keysight power supplys, but they are expensive, like teledyne. Hantek dont like display color and brightnes. I saw there are siglent power units spd4000x serias in the youtube. probably have to enjoy unit-t.
Thanks for quick review! Could You please test OCP function for different current setting? It's not switching off output for me when I set 1A/1A output/OCP and add simple resistive load that is connected all the time. Even when I short outputs. Monitor function works, but it takes few hundred milliseconds to switch output off.
Hi, Thanks, Good question, as far as i know you can not test OCP with a passive load, the CC will kick in first. you need an active load, so when the CC tries to lower the voltage, it will do that until it reaches 0 volts. then the current usualy is 0.. if you then insert current with an external source, then the OCP kicks in and the only thing what is left to do for the PSU is switch-off the output. i have a video about that testing it witrh the Siglent.. it is in teh end of the video.
Hi, i am getting back to you, as i was also not able to test OCP correctly, i send a message to UNI-T Also on my request they have put the latest firmware 1.10 on the official website. They realy want to give a good service, i like that!
@@TonyAlbus thank You for checking it out. I'm pretty sure that I have answered already, maybe YT cut my answer out. My unit is running firmware version 1.10. I think that OCP feature should work like this: if OCP and Current values are equal then PSU should switch output off after a short period when running in CC mode. In expensive PSUs this period is adjustable to prevent false OCP trips. And it shouldn't matter if load is passive or active.
@@jarekdomanski7985 It seems that there are different theories how it should work..and its implemented like wise. they may change that now because of this discussion They are working on this, i have 1.11 for test now. : Strategy for changing the output setting value and protection value i'll keep you posted.
@@TonyAlbus I'm impressed with this PSU. It's a great product overall. However, I've encountered a repeatable bug that could potentially damage connected devices. When setting the CH1 voltage to 30V and creating a square wave pattern with 2V for 0.3s and 5V for 0.3s, a brief voltage spike occurs at the start of the program. I'll share an oscilloscope screenshot via email for further clarification.
Wow! It looks like this power supply is made to automatically be setup to test devices in conjunction with other test equipment devices? 😎 Thank you Tony. Amazon $519? UNI-T UDP3305S Programmable Linear Power Supply 4 Channels 328W 0~30V DC 0~5A
Hi, that is a very good question and not the first, i still need to try that. but the specs say its fully isolated seperate psu's so you would think yes. i will do a video or QA on that.
@@TonyAlbus Thanks. I will be ordering that before too long. Actually I have found a Norwegian shop to order it from, and it will be cheaper than from Ali.
![YoungBoy Never Broke Again - Sneaking [Official Video]](http://i.ytimg.com/vi/1ILUps2zDFU/mqdefault.jpg)
Looks pretty good really, even I’m tempted to try and get one to replace my 3 channel Korad
Thanks Scott, yes i love it, i meight keep it :) .. then it needs to be opened also.
Nice device Tony, I have a slightly worse UNI-T UTP3305-II, but it's good enough for me and I'm happy with it. Thanks for the video and may it serve you for many years.
Thank you.. nothing wrong with your 3305-II it seems of good quality.
Uni-T has really been stepping up their game. And it's comparatively priced to 50 year old one's on ebay! 👍
See how it goes in the long term. I have seen and had many uni-t devices fail and warranty repair is a joke.
Yes agree, its getting better and better...
@@MickDownUnder Yes you are correct, we will see, i will maybe keep it, i like it to much to send it back.
Your video is just in time, shopping now and I'm hesitating between Rigol dp832 or dp2031 and now this uni-t for the price looks very well. Thank you!
Thanks, glad it helpen for you to make a more dificlult but hopefully better choice.
Hard to believe the price for this much power. I was sure had to at least be a switcher. Some turn-on and current limit waveforms would be interesting. Nice video, thanks.
Thanks! yes it is indeed linear, and good. if you want indepth.. on EEVblog. look for this device and find a guy called Phil .he posted some real good indepth tests there.
Super interesting... And Christmas is coming... I'm thinking about it.
Thank you Tony for the always interesting videos...✌
Thanks! .. Hohoho :)
Thank you, Tony. Another comprehensive review - much appreciated. Nice looking unit and the zoom feature is a great idea! It is a shame the software doesn't detect the NI-VISA drivers correctly, overwriting the new version with an older one can really cause problems. It looks like there is a USB port on the front panel as well as the rear panel. Regards, David
Thank you David, well spotted on the USB.. The front one is the 4th channel and can be used for charging. in the back is for storage/firmware update. yes the VISA installation was silly. maybe the VISA itself is smart enough not to install over a newer version, i i don't want to try that.... i make a weekly image of the PC.. when it is realy wrong i just restore it :)
Very nice, went ahead and ordered one, Amazon has it and a 20% discount to boot! Thanks for helping me spend some $$ Tony!
LOL sorry Jim.. you did read the disclaimer of my channel :)
Thanks for sharing your review. Apart from the little hick-up with the driver install, this otherwise seems to be a great PSU. Hope the ripple will be small. I actually have ordered the UNI-T 3305S-E from Eleshop today for myself :) as I like to get rid off my several small and cheap-ass PSUs of which I have 4 or 5 devices flying around my lab. I also have the big Aim TTi PL303 QMT-P a full-blown triple PSU which has only knobs to adjust voltage/amps "freestyle". It is my most precise and expensive PSU indeed, but nothing to quickly carry from one workbench to the other when I am working on my different projects ... so, the UNI-T will complement my equipment properly.
I very much like the possibility to enter numbers directly on the number key pad of the UNI-T. I have also the Siglent PSU since 3 years or so, where you always need the arrow keys (fine) to change position digits left or right and the knob to adjust and change voltages/amps values for that selected digit - still feels odd. Typing just the number + enter is pretty convenient ;) The Zoom mode of the UNI-T comes in very handy for having visually bigger numbers to better see. Like that! I also love the fact when either in serial or parallel mode, the display always shows the total voltage/amps. This is so weird with my Singlent PSU (as you showed also) where you just see "half" of the voltage or amps in the display when coupling the channels. However, the Siglent did a fantasctic job so far on my work bench, but this new Unit-T device will be doing alike as good on my other workbench ;) ...
Hi Markus,
Your TTi wow! good stuff. Same for me about the Siglent, mine i don't use, becouse the 2 arrow buttons ans used to change from A to V and the single [fine] is used to jump digits.. What?? Yes.. stupid . meens every time you need the change voltage you are puching at least 5 time the fine button. while they had the arrows available.. and the [fine] could be used to change from V to A .. thats why i was looking at this one.
@@TonyAlbus Totally agree. I am using my Siglent just with most relevant "fixed" voltages for channel 1 (5V) and channel 2 (12V) and use the 3rd channel with 3.3V. I does not change the values often on this device because of the reason you explained. But the built quality, the software, voltage precision, noise level is all decent and good enough for my applications, also has enough power for me. But the UNI-T will be more versatile and comes with a few cool features. Really looking forward playing with that "big boy" during next few days ... :)
@@markuskeller9734 Yes i must agree also, aside form the controls, is a great form factor, good build quality, stable, low rimple.. it wil be a great 2nd with the fixed values as you did. and have fun with the UNI-T
Latest firmware with OCP working better, in the video description, will prob be posted later on the official website but here already.
Nice review. I agree with your impressions. Just need GPIB and four-wire sensing. It would be nice to measure its ripple.
I'm still happy with my old PS2521G.
Thanks, its a linear PSU, the ripple will be low anyway.
Hey Tony, dit is een mooie lab power supply met een goeie prijs. Mocht je niet een teardown doen of tenminste even binnenin gluren?
Haha, nou hij blijft waarschijnlijk, dan gaat ie open :)
@@TonyAlbus woohoo! 😂
Nice Tony....I only have one device from this company...it was High voltage meter, i use to test our x ray units high tension cables, i did not know that grew so fast to have all sort of devices now....i was honestly looking to buy the 4 channels INSTEK power supply ...hmmm
Thanks! .. Yes they are expanding and expanding their range! .. lets see what they will bring more.
Interesting unit for sure.
But when you put it in seriel mode, as in 30 + 30 volts, do you then have access to the midpoint, so you can get -30 - ground - +30 volts out of it?
To drive something that needs both negative and positive voltage.
That is a good one, thank you, yes something i will try.
I have the same and I’m very very happy with it. Hey Tony the zoom option is missing on mine.
Hi George, the zoom function came in version 1.07 if i remember correct. version 1.10 is now available on the official website starting from today
@@TonyAlbusOk thanks for the answer Tony, do you know the procedure for the update? Is it with a usb stick?
@@GeorgePapadopoulos11 Yes the procidure is in the zip file. but : format usb-stick FAT32 use 8 or 16 gb i would advice.. not to big. copy firmware file in root, do not rename
switch off device, usb in the back, hold [UTILITY] and switch on, wait for process to finisch.
@@TonyAlbus Thank you for your valuable help Tony, I will try it tomorrow.
@@TonyAlbusOk I upgraded the firmware to 1.10,it was very easy. Now it’s much better with all the functions like yours plus it is faster. Thank you for the support Tony.
Any chance showing the world the internals ? There is no teardown video so far (1/2024). I am very interested because I can't decide between this one and Rigol DP832.
Yes i did that here: ruclips.net/video/fKXCupux7iA/видео.html
Oh sheesh , I missed that. Thanks@@TonyAlbus
Hello! What does the UDP3305S-E do if a voltage higher than that specified in its settings is applied to its input? Does it stop stabilizing or tend to absorb energy? That is, does it switch in electronic load mode or not? I'm used to the HP-AGILENT 6632, which tries to stabilize the current and voltage even if its source is not itself, that is, it switches to electronic load mode, which more closely imitates a chemical source, but without internal resistance.
No it does not do that, you can set OVP then it will switch off the output, it will not act as load.
@@TonyAlbus Thanks for the reply! This is a sad disappointment...
Do you know any laboratory power supplies with these features? Not for much money
Heloo Tony. Perhaps it would be good to show how a multi-channel laboratory power supply can be connected as a balanced supply (+12V) : 0 ground : (-12V). Connecting two channels in series does not seem to create a zero point for the positive and negative voltages. I believe that this is possible by connecting (A-) and (B+) separate channels and thus creating a zero potential for both the positive and negative voltage branches. It is good to connect the zero contact to ground (in both channels of the source).
It would be good to have a short video on how to connect it and how it works. There are several videos on RUclips about wiring two separate sources as symmetrical. I think that both separate channels of one source should work exactly the same.
Thanks, nice idea for sure
To that symmetrical voltage on multi-channel laboratory sources. Probably the most important thing is to measure with a multimeter whether the two optional channels are connected via the (-) connector. If the channels are separated (separate or floating) it is quite easy, But for some, a video on how to connect it can be inspiring, because such a resource not costs a little money and no one wants to destroy it. In addition, the question is whether the central (zero) output should be connected to the ground (usually a green connector) or whether only a "floating" ground without grounding is sufficient. If someone invests in a good lab resource, they should be able to take advantage of its capabilities. A lot of my friends have a three-channel power supply and she made a small symmetrical one with LM317T and LM337T anyway because she didn't know that it can be set even on a large power supply.
Hallo, Which power supply is better in your opinion? reliability, stability? Unit-t udp3305s-e or siglent SPD3303X-E?
Having both, i think quality is very equal but usability is much better with the UNI-T
Thank you 😉 i have eye on the Keysight power supplys, but they are expensive, like teledyne. Hantek dont like display color and brightnes. I saw there are siglent power units spd4000x serias in the youtube. probably have to enjoy unit-t.
Thanks for quick review!
Could You please test OCP function for different current setting? It's not switching off output for me when I set 1A/1A output/OCP and add simple resistive load that is connected all the time. Even when I short outputs. Monitor function works, but it takes few hundred milliseconds to switch output off.
Hi, Thanks, Good question, as far as i know you can not test OCP with a passive load, the CC will kick in first. you need an active load, so when the CC tries to lower the voltage, it will do that until it reaches 0 volts. then the current usualy is 0.. if you then insert current with an external source, then the OCP kicks in and the only thing what is left to do for the PSU is switch-off the output. i have a video about that testing it witrh the Siglent.. it is in teh end of the video.
Hi, i am getting back to you, as i was also not able to test OCP correctly, i send a message to UNI-T
Also on my request they have put the latest firmware 1.10 on the official website.
They realy want to give a good service, i like that!
@@TonyAlbus thank You for checking it out. I'm pretty sure that I have answered already, maybe YT cut my answer out. My unit is running firmware version 1.10.
I think that OCP feature should work like this: if OCP and Current values are equal then PSU should switch output off after a short period when running in CC mode. In expensive PSUs this period is adjustable to prevent false OCP trips. And it shouldn't matter if load is passive or active.
@@jarekdomanski7985 It seems that there are different theories how it should work..and its implemented like wise. they may change that now because of this discussion
They are working on this, i have 1.11 for test now. : Strategy for changing the output setting value and protection value
i'll keep you posted.
@@TonyAlbus I'm impressed with this PSU. It's a great product overall.
However, I've encountered a repeatable bug that could potentially damage connected devices. When setting the CH1 voltage to 30V and creating a square wave pattern with 2V for 0.3s and 5V for 0.3s, a brief voltage spike occurs at the start of the program. I'll share an oscilloscope screenshot via email for further clarification.
Wow! It looks like this power supply is made to automatically be setup to test devices in conjunction with other test equipment devices? 😎 Thank you Tony.
Amazon $519? UNI-T UDP3305S Programmable Linear Power Supply 4 Channels 328W 0~30V DC 0~5A
Hi, yes the S version is more expensive then de S-E version i have here. it has a higher resolution, but for me this one is good enough.
Thank you for the information. @@TonyAlbus
Hello Tony, tell me please, if the unit remember the last voltage and current settings after power off and power on.
Yes it does.
Does it do dual rail power for like opamp powering. In serie or normal mode with the center plus and minus connected?
yes it does, tried that last week, because someone asked. it worked with or without the extra ground to center too.
👍
Thank you!
I am very tenpted to get this one. Do you know if it is possibe to get -0+ on the ouputs?
Hi, that is a very good question and not the first, i still need to try that. but the specs say its fully isolated seperate psu's so you would think yes. i will do a video or QA on that.
Yes i tested this, it works, you can even connect your 0 to ground if you want, no problems.
@@TonyAlbus Thanks. I will be ordering that before too long. Actually I have found a Norwegian shop to order it from, and it will be cheaper than from Ali.
@@boeesen Perfect, yes shipping is a killer sometimes.
Nice, but not cheap. By the way, you can get therapy for test equipment hording.
Thanks, Therapy ony works for those who want to be helped :)
Thanks!