Siglent SPD3303X and SPD3303X-E Power Supplies - Page 1
Forum section: electronics / testgear

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 20, 2024, 03:09:51 pm
content: I couldn't find a generic thread for the SPD3303X, so I made this.I got a used SPD3303X (real, not hacked) for a decent deal on fleabay. It was only powered on 5 times, which is amazing since I nearly tripled that in a few minutes messing with IP and USB connections.Anyway, it came with the 1.01.01.02.07R2 firmware, and Siglent's site has the newer version 1.01.01.03.10, and I want to upgrade to that. It doesn't work though. I tried upgrading and it gives the error "The file does not match the device!" What gives? Is that only for a different hardware version?Thanks,Josh

author: tv84
author_rank: Super Contributor
timestamp: June 20, 2024, 03:13:13 pm
content: Are you flashing with a patched app or the original app?

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 20, 2024, 03:19:12 pm
content: Quote from: tv84 on June 20, 2024, 03:13:13 pmThe original app, but this isn't a hacked X-E, it's the official X model.

author: Mortymore
author_rank: Frequent Contributor
timestamp: June 20, 2024, 03:26:07 pm
content: The 1.01.01.03.10 firmware version only support s V6.1 hardware version, and yours is v3.0

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 20, 2024, 04:15:08 pm
content: Thanks, that's what I figured. I was wondering if there was any reason that the newer hardware might have an improvement, but I'm guessing it was maybe a supply chain related change. 🤷

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 20, 2024, 06:48:08 pm
content: I'm impressed with this so far. Voltage/readback accuracy says0.03% of reading+10mV, and I'm seeing it within ~1.7mV on my SDM3065X.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 21, 2024, 04:03:38 am
content: It turns out I had one channel within 2mV, and the other was much farther off (but still within spec of 0.3% + 10mV)...but that wasn't good enough for me (translation: my entertainment) so I decided to do the calibration crap for it.Did Siglent try to make calibration harder for some reason? They removed it from the newer version of the service manual, and I had to downgrade to .05 fw to get the cal commands to work. But they did!Now everything is dead on across the board on both channels. Max variance is between 0.5mV to 1mV, usually on the money though. Cal carried over fine when I upgraded back to .07R2 fw.

author: tautech
author_rank: Super Contributor
timestamp: June 21, 2024, 05:21:22 am
content: Quote from: Mortymore on June 20, 2024, 03:26:07 pmV6 HW includes the updated rectifier bridge and a slightly improved/better display when in Series or Parallel modes.As below.This thread has info on the older HW rectifier bridge failure and recommended remedy:https://www.eevblog.com/forum/repair/siglent-spd3303x-e-reboot-problem/

author: mawyatt
author_rank: Super Contributor
timestamp: June 21, 2024, 03:29:29 pm
content: @ Josh,Were you able to get LAN access?Best,

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 21, 2024, 03:36:23 pm
content: Quote from: mawyatt on June 21, 2024, 03:29:29 pmLAN access was no problem. There was one weird bug with it though. The default address is 192.168.0.100. I changed that to a different number, and when I went to do the fw update over LAN, it still showed 192.168.0.100 as the address for the update (on the fw update screen specifically). So I switched it back to .100 and left it static that way, and had no other issues. Firmware updated twice over LAN without issue.Even with DHCP on, it still chose the same address. If your LAN is 192.168.1.XXX or some other variation that could be an issue, I don't know whether the fw actually has an issue with IP addresses or not.

author: Mortymore
author_rank: Frequent Contributor
timestamp: June 21, 2024, 03:51:37 pm
content: I have the router setting the IPs for the devices, by MacAddress.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 21, 2024, 04:02:30 pm
content: Quote from: Mortymore on June 21, 2024, 03:51:37 pmSounds like a Netgear?What's the IP for your PSU(s)?

author: mawyatt
author_rank: Super Contributor
timestamp: June 21, 2024, 04:06:38 pm
content: Quote from: KungFuJosh on June 21, 2024, 03:36:23 pmCan get LAN access with all 3 PS we have with EasyPower, but can't "see" them with NI-MAX or NI-VISA. We can "see" the SDM3065X with NI but not the three SDP3303Xs??Best,

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 21, 2024, 04:09:04 pm
content: Quote from: mawyatt on June 21, 2024, 04:06:38 pmI used Putty via telnet on port 5025 to do the calibration stuff. NI-Max was too much effort to even consider. 😉

author: Mortymore
author_rank: Frequent Contributor
timestamp: June 21, 2024, 08:26:55 pm
content: Quote from: KungFuJosh on June 21, 2024, 04:02:30 pmMy router is a TPlink Archer C7, but I don't think that matters, since I believe any reasonable router has an IP address reservation table (under DHCP options)For easy memorisation, I tend to attribute IP addresses based on the device reference (SDM3055 --> IP 55)For instance:ID MAC Address Reserved IP Address1 74-5B-C5-xx-xx-xx 192.168.0.33 ---> SPD33032 00-22-24-xx-xx-xx 192.168.0.74 ---> IDS20743 CC-33-31-xx-xx-xx 192.168.0.55 ---> SDM30554 C4-F3-12-xx-xx-xx 192.168.0.32 ---> SDG1032...

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 21, 2024, 09:16:01 pm
content: Quote from: Mortymore on June 21, 2024, 08:26:55 pmIn one way or another, yes. But Netgear (at least used to) have some interesting additional choices for static routing beyond that.My current router is an Amplifi Alien, and it's interesting. You can look at the list of connected devices and manually enter a static IP after clicking on a device. No need to go through a bench of menus to set stuff like that.Have you ever updated firmware over ethernet with those IPs? Or are they all the newer hardware?

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 26, 2024, 06:19:31 pm
content: I'm concerned about the V3 hardware in my SPD3303X. I want to stress test it to see if it will survive or not.What would be a good stress test for this? I don't currently have an electronic load, but I'm not opposed to getting one.Thanks,Josh

author: tautech
author_rank: Super Contributor
timestamp: June 26, 2024, 08:34:47 pm
content: Quote from: KungFuJosh on June 26, 2024, 06:19:31 pmTheir only weak point is the 2A bridge used in earlier HW. The earliest ones gave no problem but bridge supplier may have been changed and then they very occasionally gave trouble.A faulty unit we swapped out was repaired and we stress tested it at 5A @ 32V (Parallel mode) into a Eload for 3 days while at EMEX.It provided some localised heating.

author: 2N3055
author_rank: Super Contributor
timestamp: June 27, 2024, 05:32:56 am
content: Quote from: KungFuJosh on June 26, 2024, 06:19:31 pmYou get a load and then you stress test both at the same time?

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 18, 2024, 03:31:05 am
content: How about the East Tester ET5420A+? Would that be adequate / safe to test the SPD3303X with?Thanks,Josh

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 18, 2024, 08:01:37 pm
content: I ordered the ET5420A+. I guess I'll find out if it's any good.

author: MildInductor
author_rank: Regular Contributor
timestamp: August 26, 2024, 01:05:33 am
content: I'm considering the SPD3303X vs the SPD3303X-E. I am wondering if it is worth it to upgrade from the X-E model to the X model for the 1mV/1mA resolution? I do a lot of microcontroller projects that generally have onboard regulators, so I don't think I will benefit from the X model over the X-E model. Does anyone have any thoughts on the comparison?

author: tautech
author_rank: Super Contributor
timestamp: August 26, 2024, 01:43:29 am
content: Quote from: MildInductor on August 26, 2024, 01:05:33 amAlthough a chunk dearer, also consider the 4ch SPD4323X.https://int.siglent.com/products-overview/spd4000x/I played with one for a bit while at HQ the week before last and now a few are in the order I sent through today.

author: MildInductor
author_rank: Regular Contributor
timestamp: August 26, 2024, 01:47:18 am
content: Geez that does look nice. I wish I could afford it!

author: tautech
author_rank: Super Contributor
timestamp: August 26, 2024, 01:53:38 am
content: Quote from: MildInductor on August 26, 2024, 01:47:18 amYeah I know, hummed and harred for a while but after using one will get a SPD4306X for myself and another for our local YouTuber Defpom.

author: mawyatt
author_rank: Super Contributor
timestamp: August 26, 2024, 02:16:23 am
content: Quote from: MildInductor on August 26, 2024, 01:05:33 amWe have 3 of the 3303X-E that have been "upgraded" to 3303X.These produce a stable, clean, and accurate output, however output terminal spacing is non-standard and the UI is sorta quirky. Earlier versions had issues with an overheating bridge rectifier causing random resets. Newer versions this is fixed, altho we've only experienced the random resetting in 1 of the 3 we have (all older versions).If you can live with the terminal spacing and quirky UI, then they present a good value. The newer 4000 series looks interesting, but at additional cost!!Best,

author: tautech
author_rank: Super Contributor
timestamp: August 26, 2024, 02:30:55 am
content: Quote from: mawyatt on August 26, 2024, 02:16:23 amCertainly, however look at the additional they offer:4 fully adjustable channels, all 1mV/1mA resolution.2 remote sense channels.Numeric keypad3/4" terminal spacingWebserver2x USB-AQuite interested to give one a decent workout...........

author: AVGresponding
author_rank: Super Contributor
timestamp: August 26, 2024, 07:45:47 am
content: Quote from: tautech on August 26, 2024, 02:30:55 am19mm spacing? Did the designer make a mistake?I thought later X-E's are not hackable to X?

author: tautech
author_rank: Super Contributor
timestamp: August 26, 2024, 07:55:24 am
content: Quote from: AVGresponding on August 26, 2024, 07:45:47 amFFS keep up with the play !https://www.eevblog.com/forum/testgear/siglent-spd3303x-e-hi-resolution-output-unlock/msg5586827/#msg5586827

author: KungFuJosh
author_rank: Super Contributor
timestamp: August 29, 2024, 08:26:29 pm
content: It took 42 days in transit, and Rob says it probably won't help with the sketchy part in the PSU, but the DC load finally arrived.

author: KungFuJosh
author_rank: Super Contributor
timestamp: August 29, 2024, 10:57:33 pm
content: What's the maximum parallel current level supposed to be? I didn't see a number specified in the datasheet or manual. For some dumb reason, I thought maybe closer to 6.4A.If I set the load above 6.17A, the PSU LEDs turn red and it starts beeping. That's with CH1 at 3.2A, and CH2, under 3A. This happens whether or not CH3 is active. PSU max power is supposed to be 220W, but it's under 195W and still whiney.

author: tautech
author_rank: Super Contributor
timestamp: August 29, 2024, 11:51:49 pm
content: Quote from: KungFuJosh on August 29, 2024, 10:57:33 pmProbably need to use a sense connection on your load for accurate readings from a banana lead connection.Consult the Quick Start guide for Series and Parallel output.P14/15https://int.siglent.com/u_file/download/22_11_25/SPD3303X_QuickStart_E02A.pdf

author: KungFuJosh
author_rank: Super Contributor
timestamp: August 30, 2024, 12:10:08 am
content: Quote from: tautech on August 29, 2024, 11:51:49 pmThanks, I have all the manuals. I consulted P15 before setting it up.Why wouldn't the display on the SPD3303X be trustworthy for its output? The SPD channels say 3.199 + 2.94 = 6.139A. The load display says 6.14A. Why shouldn't I believe them both? I can run some regular wires if you think that matters.

author: tautech
author_rank: Super Contributor
timestamp: August 30, 2024, 12:26:56 am
content: Try setting AC In Line voltage for best match to your actual line voltage.....might help, dunno.

author: KungFuJosh
author_rank: Super Contributor
timestamp: August 30, 2024, 12:35:17 am
content: If you mean powering either device, it's already set that way.I ran one of my DMMs in series with the circuit, and current display agrees on all devices. 🤷

author: MildInductor
author_rank: Regular Contributor
timestamp: August 30, 2024, 01:21:24 am
content: KungFuJosh do you like your SDM3045X that I see in the photo? I am considering getting a Siglent DMM in the near future. The SDM3045X looks to be quite a few years old now. Perhaps you know if Siglent is going to refresh these series of DMMs soon tautech?

author: MildInductor
author_rank: Regular Contributor
timestamp: August 30, 2024, 01:23:14 am
content: It seems like Siglent is transitioning their product line away from the classic white to the new black shade if I am not mistaken…

author: KungFuJosh
author_rank: Super Contributor
timestamp: August 30, 2024, 01:51:54 am
content: Quote from: MildInductor on August 30, 2024, 01:21:24 amI like the Siglent bench DMMs a lot. I usually use my SDM3065X more, but I often like using the SDM3045X (which is upgraded to SDM3055X-E) because it has no fan.The other series (dark case) of Siglent DMM you're thinking of is different. The SDM4000A meter series is considered professional, and comes with the pro price tag too.

author: MildInductor
author_rank: Regular Contributor
timestamp: August 30, 2024, 01:59:15 am
content: Good to know.Thanks.

author: tautech
author_rank: Super Contributor
timestamp: August 30, 2024, 02:56:28 am
content: Quote from: MildInductor on August 30, 2024, 01:21:24 amSure but constantly being improved by way of minor changes to HW.For the average Joe and even repair shops the 3045X is quite popular and dead quiet, an advantage when ON all day.QuoteOnly by way of a new SDM4000A series as Josh explained but won't be available until next year.AFAIK a 4.5 digit model won't be included.

author: MildInductor
author_rank: Regular Contributor
timestamp: August 31, 2024, 01:19:34 am
content: Got it, thanks.

author: MildInductor
author_rank: Regular Contributor
timestamp: September 02, 2024, 09:41:24 am
content: A bit off topic… but I wonder what SDM, SPD, SDG, and SDS stand for in the prefix of the Siglent model naming?SDM would stand for Siglent Digital Multimeter I suppose. I don’t know about the others though.

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 04, 2024, 11:59:44 pm
content: My SPD3303X is off to Siglent NA for warranty repair. It had an issue where it couldn't get to the max current level in parallel mode. Hopefully I get it back quickly, I gave away my old PSU.

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 25, 2024, 05:52:45 pm
content: Quote from: KungFuJosh on September 04, 2024, 11:59:44 pmI got word today that my V3.0 hw has been upgraded to V6.2. I'm looking forward to getting it back.Thanks,Josh

author: KungFuJosh
author_rank: Super Contributor
timestamp: October 01, 2024, 05:34:20 pm
content: It's alive!New hardware came with a new serial number, that's cute.Also a new firmware version that isn't on the website: 1.01.01.03.11R1I couldn't go above ~6.17A before, now I have to go above 6.44A before it shifts to CC mode on both channels and the voltage drops. Besides being better than expected, that's a huge improvement since it failed and freaked out with beeping noises on the old HW version over 6.17A.It's been running stable for a little while now, and the only change is when the load fan turns on and off occasionally.Siglent support is awesome.Thanks,Josh

author: KungFuJosh
author_rank: Super Contributor
timestamp: October 01, 2024, 06:34:56 pm
content: The ET5420A+ is the load being used. Every time the fan turns on, the current draw dips. Then it climbs back up, and the fan comes back on. It's not drastic, but it's still kinda funny.ETA: Here it is again, this time for a couple hours:

author: MathWizard
author_rank: Super Contributor
timestamp: January 11, 2025, 12:17:52 am
content: I can't remember what year I got my SPD3303X-E, but it's V3.0, w/ old old 1.01.01.02.05 firmware, it says Release Date 12.11.17 on the website. So thats way before I bought it, and unlocked it to the 3303X.Today is the 774th time it's been on. I never really load tested it, but I love it. So these can be calibrated by the user as well, but yeah it's not been an issue, it does fine.So today I might update all my Siglent gear, what firmware should I update this with ? Thanks

author: KungFuJosh
author_rank: Super Contributor
timestamp: January 11, 2025, 12:47:25 am
content: Quote from: MathWizard on January 11, 2025, 12:17:52 amI think .07R2 is the latest for that hardware version. I included the service guide to calibrate on Reply #6 if you need to do that before upgrading (I had to downgrade to cal and then reupgrade to 7R2).

author: MathWizard
author_rank: Super Contributor
timestamp: January 11, 2025, 01:33:46 am
content: Yeah thanks I DLed the manual tonight. So do you mean to calibrate, you had to down grade the firmware 1st ?I hardly use big currents, IDK how good/bad it does then. But for low currents, I'm happy with the cal, it seems about right. IDK what to expect for the 1st 100mV, but it's not that bad.

author: KungFuJosh
author_rank: Super Contributor
timestamp: January 11, 2025, 02:15:20 am
content: Yes, I had to downgrade to calibrate with those instructions. If you're content with the accuracy, then it shouldn't matter for you.

author: MathWizard
author_rank: Super Contributor
timestamp: January 11, 2025, 04:24:15 am
content: So what other hardware changes are there besides some rectifier (I think a 4-pin one was changed). I can't remember if I checked for that in mine.Anything fairly easy and cheap to change ? Did they change any chips ?

author: Oaklander
author_rank: Regular Contributor
timestamp: January 21, 2025, 05:13:53 pm
content: There are older mentions about the output terminals being bad. Banana plugs falling out etc.Are the issues fixed on new units?

author: KungFuJosh
author_rank: Super Contributor
timestamp: January 21, 2025, 06:48:17 pm
content: Quote from: MathWizard on January 11, 2025, 04:24:15 amThey changed the whole front PCB. Layout is better, and not sure what changed besides the rec. I think Rob has some photos posted somewhere.Quote from: Oaklander on January 21, 2025, 05:13:53 pmThe newer terminals are good, but not standard 19mm spacing. I think it was only the earliest releases that had issues with the terminals.

author: thenickdude
author_rank: Newbie
timestamp: March 24, 2025, 07:28:14 am
content: Just received mine, and the jacks are nice and tight with both the included banana leads and the ones I had already.

author: tautech
author_rank: Super Contributor
timestamp: March 24, 2025, 07:33:16 am
content: Quote from: thenickdude on March 24, 2025, 07:28:14 amFrom whom may I ask ?Welcome to the forum.

author: thenickdude
author_rank: Newbie
timestamp: March 25, 2025, 09:25:05 am
content: Amazon.com (it's marked "Sold by: Amazon Export Sales LLC", and it's hardware revision V6.2), and thanks for the welcome!Was happily surprised to discover that it beeps when in constant-current mode, a feature I hadn't seen any reviews mention before. I enjoy knowing immediately when my board has a short on it!My previous bench supply was a single rail that didn't go lower than about 4.5V, only had one decimal place of resolution, and capacitively coupled so much mains noise into the DUT that it disabled the fingerprint reader on my connected battery-powered laptop, so this is a huge step up.

author: magnetman
author_rank: Newbie
timestamp: May 08, 2025, 10:07:34 am
content: Hi All,I hope i haven't missed a post answering this question. I have requirement for +/-12V and 5v. I have worked out the +/-12v but was wondering if it was OK to connect the negative of the ch3 l to the negative of the ch 1/2 arrangement? i need a common negative supply for my application (euro-rack format synth). Hope that makes sense.Cheers Luke

author: tautech
author_rank: Super Contributor
timestamp: May 08, 2025, 11:19:38 am
content: Quote from: magnetman on May 08, 2025, 10:07:34 amWelcome to the forum.All Siglent PSU's have fully isolated channels so arrangements like you are wanting are very possible.For the+15V, Series mode is the way to do this and tap the center for 0V and connect the -5V to this point also.In Series mode Ch1 becomes the master and Ch2 tracks any adjustment.If you have a later model with updated HW, Series mode will be displayed at the top edge of the display along with the illuminated Series button which is all we got with the earlier HW versionThe 3rd channel 5V is unregulated so take care with any circuits you supply with it.Normally we might prove a circuit is behaving with one of the other 2 regulated outputs before trusting it to the unregulated output.

author: magnetman
author_rank: Newbie
timestamp: May 08, 2025, 10:55:33 pm
content: Thankyou, very much, for the information and the welcome.

author: mawyatt
author_rank: Super Contributor
timestamp: May 09, 2025, 01:22:04 am
content: What tautech is referring too as "unregulated" wrt to the 3303X means CH3 has no Selectable Current Limit Regulation as in CH1 and CH2. CH3 does have 3 Fixed Voltage Regulations tho, fixed at 2.5, 3.3 and 5.0 Volts, selectable by a slide switch.BTW these are areasonably goodvalue lab type PS, with good resolution and stability. They have some issues tho, like UI is a little quirky (easily adapted too) and a potential issue with the older hardware versions, where the supply will reset itself during operation. This was traced to an overheating Bridge Rectifier which isn't difficult to replace. Also, the Banana Terminals are different than most and don't always allow the plug to fully engage in the HW versions we have.All in all they are a good value but there are better supplies with more features like the GPP4323 which we also have, and maybe (we don't have these) the new SPD4000 series and the Rigol equivalent, however all these are more expensive.One important thing for any Lab Supply is NOT having a significant Turn-On/Off output voltage glitch which can and will destroy sensitive semiconductors!! Our Korads, Siglent's and GS Instek Supplies don't do this, we made sure of that!!Best

author: tautech
author_rank: Super Contributor
timestamp: June 12, 2025, 04:00:36 am
content: Been working through a fault in a customers unit.....a little less hair has been the result !Finally have traced its no boot to a excess current draw to the front panel PCB via the ribbon cable connection....this might also be a contributing factor to failure of the wee circular 2A bridge in V1 HW.However a V2 HW Mainboard with the uprated bridge still had 1 test point pulled low, the 3V3 that supplies the front panel PCB.Working with Siglent to improve their Service manual identified a few errors in their Mainboard voltage table when it comes to the new improved mainboard.For the 11 test points there are severaldifferentreference points thatmustbe used to take the voltage readings and I've outlined all this and their locations and test pins in the attached table.Hopefully this saves someone a few hairs......E&OE

author: MathWizard
author_rank: Super Contributor
timestamp: July 07, 2025, 11:51:47 pm
content: Hey tautech, what's the bandwidth of these PSU's, what's a typical BW of a bench PSU ? I'm just wondering since I'm designing an E-load, and to get any sort of BW, I don't have much gain left, with OP07's and OP277's in LTSpice.Oh I thought this was the real thread, started by tautech.

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 08, 2025, 12:17:45 am
content: Quote from: MathWizard on July 07, 2025, 11:51:47 pmThis is the real thread. Tautech doesn't start every Siglent thread.

author: MathWizard
author_rank: Super Contributor
timestamp: July 10, 2025, 10:41:22 pm
content: Doesn't anyone know ?? I don't see it in the datasheet

author: tautech
author_rank: Super Contributor
timestamp: July 10, 2025, 11:04:06 pm
content: Quote from: MathWizard on July 07, 2025, 11:51:47 pmNever heard of BW being a PSU spec.Maybe you mean recovery time:Recovery Time < 50μs ( 50% load change, minimum load 0.5A )

author: MathWizard
author_rank: Super Contributor
timestamp: July 10, 2025, 11:19:06 pm
content: So it would have very high DC gain, and then start falling off pretty quick, so what would be the -3dB point ? I'm surprised they aren't normally given, I figured that would be the norm.

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 10, 2025, 09:05:44 am
content: Is there any way to adjust the scale on the Y axis for the waveform display? Or even Autoscale? By default, unless you're looking at a change of amps, the line is basically a useless flat line across the bottom of the display....

author: PatrickJ
author_rank: Newbie
timestamp: September 12, 2025, 10:12:05 am
content: Hi,I got my SPD3303X-E yesterday. I connected it to the network, and by pressing the IP button, I was able to check the IP address it got via DHCP, 192.168.107.153. The device appears on my router's device list, and I can ping its IP. Then I tried to connect tohttp://192.168.107.153, but Chrome is stating that "This site can't be reached". Is there a web server on this device? If yes, what is the URL I should use? If no, I wonder what is the interest of connecting it to the network...

author: tautech
author_rank: Super Contributor
timestamp: September 12, 2025, 11:15:05 am
content: Quote from: PatrickJ on September 12, 2025, 10:12:05 amNo.For web control use EasyPowerX:https://int.siglent.com/upload_file/zip/software/Power_Supply/EasyPowerX_V1.0.2.zipStudy the install dependancies.Or see Remote Control P25 in the manual:https://int.siglent.com/u_file/download/22_11_25/SPD3303X_QuickStart_E02A.pdf

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 12, 2025, 02:48:29 pm
content: It also works with TestController software.

author: PatrickJ
author_rank: Newbie
timestamp: September 16, 2025, 12:47:14 pm
content: I was looking for a solution that would not need to install any software, as EasyPower is Windows only, and I am working exclusively on Mac. To issue SCPI commands, do you also need a specific software, or can you do it from a terminal?

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 16, 2025, 01:07:01 pm
content: Quote from: PatrickJ on September 16, 2025, 12:47:14 pmTestController software:https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/It's Java based, small, and can run on any OS that supports Java.You can try connecting from a terminal, but TestController does everything you want, including other stuff like automation and data logging.

author: tautech
author_rank: Super Contributor
timestamp: September 19, 2025, 10:29:15 am
content: SDP3303X-E repair.Apart from other faults the 4 wire cooling fan was found to be faulty where they normally spin at slow RPM and almost silent at zero load but this units fan did not spin at all.PSU load tests that would normally kick the fan into gear failed to wake it up yet a replacement fan from a new unit worked as it should.Red, black, yellow and blue are the wire colors and research found they should spin at max speed when 12V is placed on the red and black yet this unit didn't and drew just 80mA when its rating was 12V 500mA.Physical size is 80 x 80mm x 25mmSome Googling found similarly rated fans on ePay and I link them here:https://www.ebay.com/itm/396837400548https://www.ebay.com/itm/256398800649Please note the connector might need modifying to match a stock fan......