New Siglent SPD4000X series power supply - Page 1
Forum section: electronics / testgear

author: oewean
author_rank: Contributor
timestamp: September 18, 2023, 01:00:23 pm
content: Siglent has a new power supply, SPD4000X series.Looks nice and well speced.https://www.siglent.com/products-overview/spd4000x/

author: blurpy
author_rank: Regular Contributor
timestamp: December 11, 2023, 01:40:19 pm
content: Video here:Looks like only 2 of the channels are 32 volts.

author: mawyatt
author_rank: Super Contributor
timestamp: December 11, 2023, 02:37:21 pm
content: Looks like they got the banana terminals finally spaced properlySeem relatively expensive compared to the SPD3303X-E, altho having 4 channels like the GPP-4323 is nice, as is remote sense on 2 channelsBest,

author: nctnico
author_rank: Super Contributor
timestamp: December 11, 2023, 03:28:16 pm
content: Quote from: mawyatt on December 11, 2023, 02:37:21 pmAnd it has a numeric keypad.

author: Antonio90
author_rank: Frequent Contributor
timestamp: December 11, 2023, 03:35:52 pm
content: Is it made by GWInstek?

author: 2N3055
author_rank: Super Contributor
timestamp: December 11, 2023, 03:38:59 pm
content: Quote from: Antonio90 on December 11, 2023, 03:35:52 pmWhat kind of question is that?They are both manufacturers.Others rebrand their products, respectively....

author: nctnico
author_rank: Super Contributor
timestamp: December 11, 2023, 04:13:41 pm
content: Quote from: 2N3055 on December 11, 2023, 03:38:59 pmA very logical one as Siglent and GW Instek have sold the same power supply before.On second look I notice the USB-A is at the back instead of on the front. Who thought of that?

author: 2N3055
author_rank: Super Contributor
timestamp: December 11, 2023, 04:42:09 pm
content: Quote from: nctnico on December 11, 2023, 04:13:41 pmSeriously ?I had no idea that was the case...Which one?As far as I know that is not so now...

author: Antonio90
author_rank: Frequent Contributor
timestamp: December 11, 2023, 05:46:53 pm
content: Quote from: 2N3055 on December 11, 2023, 03:38:59 pmJust curious, my apologies if it's a stupid question. It struck me as quite similar to the GPP range, visually speaking and in terms of layout. Not saying they are identical, but I wouldn't be surprised if they share the front-panel PCB, or use a very similar one.Also, if I'm not mistaken, The SPD3303X-E shares at least the output stages with a GWInstek PSU, can't remember which.I don't say that as a bad thing, I quite like GWInstek.

author: tautech
author_rank: Super Contributor
timestamp: December 11, 2023, 08:08:30 pm
content: Quote from: mawyatt on December 11, 2023, 02:37:21 pmFYISPD1000X models use 19mm terminal spacings.Quote from: nctnico on December 11, 2023, 04:13:41 pmI too ask for qualification for this statement.QuoteTo date,noneof the Siglent linear PSU's had a USB A port at all and this is a welcome addition to the range so to not need PC SW to update firmware and use USB external memory to store/load setup/config files.

author: 2N3055
author_rank: Super Contributor
timestamp: December 11, 2023, 08:11:04 pm
content: Quote from: Antonio90 on December 11, 2023, 05:46:53 pmNo not stupid, I was just confused because AFAIK they don't do rebrands, other rebrand their products.. I'm not aware of any collaboration with GW Instek in that regard.And yes,I like GW Instek too, very decent company and products.

author: nctnico
author_rank: Super Contributor
timestamp: December 11, 2023, 09:33:04 pm
content: Quote from: Antonio90 on December 11, 2023, 05:46:53 pmThe GW Instek GPD-3303S shares the same construction and the same output stage. And it wouldn't surprise me if this collaboration goes much further than this product. After all, GW Instek has a much longer history designing power products compared to Siglent. It wouldn't make sense re-invent the wheel just to satisfy NIH syndrom.

author: tautech
author_rank: Super Contributor
timestamp: December 11, 2023, 09:50:59 pm
content: Quote from: blurpy on December 11, 2023, 01:40:19 pmAnd 6A each.SPD4306X looks the most interesting/capable model with two 30V 6A and two 15V 1.5A outputs which if can be seriesed/paralleled provides for a useful range of outputs.....60V 6A or 30V 12A would be very handy for some.

author: Martin72
author_rank: Super Contributor
timestamp: December 11, 2023, 10:05:22 pm
content: Quote from: oeweanNot for me, although I generally have a problem with the look of today's power supply units, which are becoming more and more overloaded and pop-colored.The second point, which is not so interesting for private use, is the terminals.At work, we only use 4 mm safety test leads, which don't fit in there.No, for once I'm not impressed by a siglent product, I like the 4-channel from GW Instek much better, both visually and in terms of the connections.

author: tautech
author_rank: Super Contributor
timestamp: December 11, 2023, 10:26:42 pm
content: Quote from: Martin72 on December 11, 2023, 10:05:22 pmShrouded retractable ones ?

author: Antonio90
author_rank: Frequent Contributor
timestamp: December 11, 2023, 10:39:45 pm
content: The Instek is quite nice, although 33% more expensive than the equivalent Siglent (chinese MSRP)Will any of the Siglent offerings operate on two quadrants as the GPP?I have a GPD-4303S, which I like quite a bit except for the fact that it can only turn on and off all channels at once. I did burn a cheap 3v chinese scale with 20v by mistake thanks to that. Also, no numpad. This looks like a very good replacement.

author: Martin72
author_rank: Super Contributor
timestamp: December 11, 2023, 10:50:24 pm
content: Quote from: tautech on December 11, 2023, 10:26:42 pmWe have a few dozen of them as atemporary solutionfor our old devices without safety bananas(until they will be replaced).I'm certainly not going to buy appx 300 new cables so that I can use a power supply unit with such terminalsIn addition, these sliding sleeve cables are mechanically fragile and of poor quality, even though they come from Hirschmann.

author: tautech
author_rank: Super Contributor
timestamp: December 11, 2023, 11:12:02 pm
content: Quote from: Martin72 on December 11, 2023, 10:50:24 pmHmmm, never had such problems with the 100's we've supplied from Aliexpress.However we did get a sample shipment for assessment before bulk purchase.

author: Martin72
author_rank: Super Contributor
timestamp: December 11, 2023, 11:19:51 pm
content: QuoteWe use them daily under partly rough conditions, not only to connect something that is on a lab table.

author: temperance
author_rank: Super Contributor
timestamp: December 11, 2023, 11:58:12 pm
content: hm, keypad and 1 rotary encoder... So you want to adjust the output voltage on CH1. You turn the encoder and ooops, magic smoke. You just adjusted CH2.I don't like those power supplies for generic daily use and prefer supplies with separate pot's or encoders for current and voltage for each channel.

author: nctnico
author_rank: Super Contributor
timestamp: December 12, 2023, 12:26:43 am
content: Typically I never use the encoder on a PSU with a keypad. Typing in the number is quicker and you can cancel before comitting the new setting.

author: tautech
author_rank: Super Contributor
timestamp: December 12, 2023, 06:12:45 am
content: Quote from: Martin72 on December 11, 2023, 10:05:22 pmDwelling on these comments, I believe many instead will prefer terminals that provide connection options.Generally the hobbyist prefers multiple connection choices and I certainly do as when I built my first PSU one of the must haves was cross hole drilled binding posts with banana sockets which is just what this new Siglent PSU provides.This allows for plain wire, forkandbanana connections.OTOH your work you may have different requirements for outputs than the target market Siglent has catered for.

author: 2N3055
author_rank: Super Contributor
timestamp: December 12, 2023, 07:07:55 am
content: I don't understand why more manufacturers don't use these...

author: NE666
author_rank: Frequent Contributor
timestamp: December 13, 2023, 01:23:00 pm
content: Quote from: 2N3055 on December 12, 2023, 07:07:55 amYup, and note the sense terminals on the front panel too

author: 2N3055
author_rank: Super Contributor
timestamp: December 13, 2023, 01:25:32 pm
content: Quote from: NE666 on December 13, 2023, 01:23:00 pmYep..

author: tszaboo
author_rank: Super Contributor
timestamp: December 13, 2023, 02:04:30 pm
content: Quote from: 2N3055 on December 12, 2023, 07:07:55 amAIM-TTI. They have some great power supplies we have a bunch of them at work. Nice small, not bloated, quality, quiet, and lot's of features on the front panel.This one from Siglent, also looks nice, well thought user interface.

author: MathWizard
author_rank: Super Contributor
timestamp: December 14, 2023, 01:47:22 pm
content: So these aren't for sale yet? Or only in Asia ? I have the spd3303x and it's great for the low power stuff I've been doing. And adjustable bench PSU's are so convenient and easy, compared to going to the junk box for old dirty SMPS's, or messing around with linear regulators.I made a 20V 1A CV-CV PSU that's decent enough, but it's only 1 channel. And just working on an AM TX and RX, I would like another channel or 2. I'm forgetting I have another 5V rail on my 3303x, I'm going to use that right now.I'll be watching for these when I go to get another PSU.

author: mawyatt
author_rank: Super Contributor
timestamp: December 14, 2023, 02:55:42 pm
content: The PS is an often overlooked piece of test bench equipment. Having a good multi-channel, low noise, accurate, quiet PS will prove itself in short order when doing lab test & development work. One that doesn't exhibit voltage overshoot at Turn On or Off, and quick, accurate low level Current Limit are important features when working with low voltage circuits like modern CMOS. The 3303X we have (3) have delivered such with only complaints being the unusual terminal spacing (which seems to be corrected in the 4000) and somewhat quirky UI which one quickly gets used too.We also have a GW Instek 4323, another really nice PS with all those features and 4 controllable/displayed channels. However the "GoTo" PS for most of our lab bench use in the 3303X, it's quick, easy and just gets the job done on the bench without hassleBest,

author: exe
author_rank: Unknown
timestamp: December 14, 2023, 09:37:48 pm
content: What are the prices?

author: Antonio90
author_rank: Frequent Contributor
timestamp: December 15, 2023, 08:17:39 am
content: You can find them in the chart at the end of the chinese Siglent page.€ 625 for the 2x 6V 3.2A & 2x 32V 3.2A€ 755: 2x 15V 1.5A & 2x 15V 10A€ 1009: 2x 15V 1.5A & 2x 30V 10AAll of them are within 0.03% + 0.03 of readback value.Noise and transient response seem also quite good.I would compare them with the ~equivalent from GW Instek and pick based on price and support/availability locally, as they do seem to be pretty similar, and I wouldn't be surprised if they share the internals.

author: GnomeZA
author_rank: Regular Contributor
timestamp: December 16, 2023, 03:26:27 pm
content: I have a SPD3303X-E (hacked to SPD3303X), I'm a hobbyist so I use it weekly (not daily).The powersupply is superb but the way they have you switch between voltage and current adjust on the current channel and adjust the voltage update and down is atrocious.I make mistakes all the time because the "fine" key and left right keys are just restrictive and stupidly setup.It's like they didn't do any usability studies.It is objectively badly designed in that way.I really hope the new version improves on that, I feel like this isn't a hard problem to solve.

author: BillyO
author_rank: Super Contributor
timestamp: December 28, 2023, 04:29:01 am
content: Quote from: Martin72 on December 11, 2023, 10:05:22 pmI must be missing something but why would you need safety terminals on a LV, LC, short circuit protected PS?Is it because they are the only leads you have?It seems a bit of a strange parameter on which to make a purchasing decision. Especially if it meant you'd have to put up with an inferior power supply. Maybe you have a ton of test leads, but only need a few power supplies? But then you'd only need to buy a few leads to work with the few supplies.Not trying to be combative .. I just really don't understand this. Leads are not very expensive and it seems having a variety for specific needs might actually be a good idea.I guess one reason might be that a company has a lot of unqualified personnel that might stupidly use a non-safety lead in a HV, HC, CAT IV situation.Of course, if they were likely to make that error they should not be allowed to work in such an enviroment.

author: nctnico
author_rank: Super Contributor
timestamp: December 28, 2023, 10:27:34 am
content: Keep in mind Darwin is very keen on handing out awards as he has an infinite amount of thoseIt looks like Martin is working in a lab where they have lots of high voltage / mains powered systems. I wouldn't want to have non-isolated banana leads available to anyone in such an environment. It is too easy for people to get tempted to use a non-isolated one where they really, really should use an isolated one.

author: tautech
author_rank: Super Contributor
timestamp: December 28, 2023, 11:09:25 am
content: Quote from: nctnico on December 28, 2023, 10:27:34 amAnd/or have retractable shrouded leads…..

author: BillyO
author_rank: Super Contributor
timestamp: December 28, 2023, 03:22:16 pm
content: Quote from: nctnico on December 28, 2023, 10:27:34 am...Quote from: nctnico on December 28, 2023, 10:27:34 amPerhaps you are right but maybe if the people would carelessly use leads with bare metal showing in HV situations it may be advantageous in the long run to allow them to win their award.

author: Antonio90
author_rank: Frequent Contributor
timestamp: December 28, 2023, 03:32:56 pm
content: Quote from: BillyO on December 28, 2023, 03:22:16 pmIt is a matter of probability I guess. The most reasonable person can make a blunder or do something stupid.They already have a setup of test leads that work and have been chosen according to regulations, internal policies and test setups. I really don't see the problem, taking into account that there are other options in the market with specs just as good as these.

author: mon
author_rank: Contributor
timestamp: February 11, 2024, 05:46:27 am
content: Lurked for a long while but this PSU has got me excited enough to make an account.I feel like this is going to be averypopular mid-range supply, even with the price looking almost double that of the SPD3303X. I'm in the market for a new lab supply and it seems like it solves many of the problems that others haveNormal number input (unlike the totally lacking SPD3303X, and the insane circular input of the rigols)Actual programmable voltage/current for the lower voltage inputs (no fixed outputs as the SPD3303X)Short form factor for the cheapest model (unlike the rigols)Fully isolated (Rigol 900 series fixed that, but the 800 series is still popular)1mV/1mA as standard (you could argue the unlock hacks make this unimportant)hopefullydoesn't have the power-on spikes and hot regulators, seems both Rigol and Siglent fixed that in the previous generationAnd personally, I do like the black case. I won't comment on the protected bananas, I don't use them much...The only other real competitor in this price range is the GPP-4323, but in Australia they're pricey at A$1300, and I hate the 4/1/2/3 port numbering.User manual (in chinese)has the dimensions.220x144.97mm on the front panel, 335mm deep for the SPD4323X and 395mm deep for the higher spec models.It'll be an added bonus if the release of this drops the price of the 3000 series.

author: tautech
author_rank: Super Contributor
timestamp: February 11, 2024, 06:29:13 am
content: Welcome to the forum.The top model SPD4306X is listed as ￥7,880 which is roughly 1100 USD so getting up there however western pricing has never converted well. We'll just have to wait and see.I've asked questions about these PSU's but not got much info.....yet.

author: mon
author_rank: Contributor
timestamp: February 11, 2024, 06:41:28 am
content: Quote from: tautech on February 11, 2024, 06:29:13 amYes, the top model is definitely a big jump in price - I'm looking solely at the lowest tier which seems a lot more bang for buck.Fingers crossed we get a full release of this and the new HD scopes after Chinese New Year.

author: tautech
author_rank: Super Contributor
timestamp: February 11, 2024, 07:06:23 am
content: Quote from: mon on February 11, 2024, 06:41:28 amSadly no, only the 3 new ranges of HD scopes will come available in the next few weeks.I have asked for a 2024 release program which they were preparing and maybe that won't be finalised for a few weeks.

author: mon
author_rank: Contributor
timestamp: March 30, 2024, 11:21:52 am
content: Quote from: tautech on February 11, 2024, 07:06:23 amIt's been a handful of weeks - any news on a release date?I'm already starting to line up projects to utilise the remote programming - not like another PSU can't do the trick (GW-4323 calls strongly), but I'm still enamoured with this new one, and the dumb Tenma from work doesn't cut it.

author: MathWizard
author_rank: Super Contributor
timestamp: March 30, 2024, 01:32:19 pm
content: Will the older models get any cheaper ?

author: seajayshore
author_rank: Contributor
timestamp: April 09, 2024, 02:56:29 pm
content: Just chiming-in to say these new power supplies do look very nice on paper. Especially the SPD4306X (400W) one in my case...I wonder how loud it will be though... My SPD3303X is a little noisy IMO (but I don't have many other references).

author: tautech
author_rank: Super Contributor
timestamp: April 09, 2024, 07:15:56 pm
content: Quote from: seajayshore on April 09, 2024, 02:56:29 pmNot long to wait, they should be available in July.QuoteThese are almost silent at low loads, are you pushing yours ?The 4000 series seems to share the same size enclosure and fan however capable of higher output capability one would expect greater fan cooling to manage the top model 400W specification.

author: seajayshore
author_rank: Contributor
timestamp: April 10, 2024, 05:50:12 pm
content: Thanks for the update tautech - keeping watchAs for my SPD3303X - my current project has it sat around 45-55W consistently (19V if that makes a difference). So like 20-25% of full load?It's not annoyingly noisy I should add - and is definitely silent at much lower power - but yeah it's sat right next to me so I notice. Very happy with it all the same!

author: AddisonAve1938
author_rank: Newbie
timestamp: April 25, 2024, 05:20:22 pm
content: Does anyone have an idea or the inside scoop of as to when these will hit the North American market?

author: BillyO
author_rank: Super Contributor
timestamp: April 25, 2024, 05:29:12 pm
content: Quote from: AddisonAve1938 on April 25, 2024, 05:20:22 pmI'm guessing mid-summer, however you could put in a query to siglentna.com.

author: tautech
author_rank: Super Contributor
timestamp: May 08, 2024, 09:07:28 am
content: Quote from: AddisonAve1938 on April 25, 2024, 05:20:22 pmHaven't got an actual release date yet but these are soon be announced to distributors so it would seem not long to wait now.Got our name on one......

author: tautech
author_rank: Super Contributor
timestamp: June 04, 2024, 07:57:42 pm
content: Some dealer resources recently arrived....Not long to wait now.

author: atroz
author_rank: Newbie
timestamp: June 25, 2024, 03:50:44 pm
content: Prices are up on the NA site although this page doesn't seem to show up from their front page yet.https://siglentna.com/products/dc-power-supply/spd4000x-series/SPD4323x is $680, SPD4121 is $780 and SPD4306X is $950.

author: tautech
author_rank: Super Contributor
timestamp: June 25, 2024, 04:12:35 pm
content: Quote from: atroz on June 25, 2024, 03:50:44 pmWelcome to the forum.Pricing is correct and official release is just a few days away.

author: thm_w
author_rank: Super Contributor
timestamp: June 25, 2024, 09:58:41 pm
content: SPD4121X would have been great but not sure I understand the choice of a 12V maximum output (12V 10A x2, 15V 1.5A x2).Usually for automotive/battery simulation you'd want around 13 or 14V.Even for testing a 12V product, you'd sometimes want to try +/-10%.This is why ~6.3V is somewhat standard (for use with 5V designs).

author: exe
author_rank: Unknown
timestamp: June 26, 2024, 06:42:40 pm
content: Quote from: thm_w on June 25, 2024, 09:58:41 pmHa-ha, I thought it's for vacuum tubes.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 26, 2024, 07:26:07 pm
content: Quote from: thm_w on June 25, 2024, 09:58:41 pmI don't know why they chose those specific specs, but each of the 3 models appears to be geared towards different V/A requirements. The SPD4323X would be the only version I would consider, and that has nothing to do with it being the cheapest...which doesn't hurt either.ETA: Okay, price did matter. I just looked again at the SPD4306X, and those specs would work too, but not for the price.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 26, 2024, 08:45:32 pm
content: Hmmm, this is interesting...SPD4306X:Weight 26.46 lbsDimensions 8.7 × 14.17 × 5.24 inSPD4121X:Weight 26.46 lbsDimensions 8.7 × 14.17 × 5.24 inSPD4323X:Weight 17.64 lbsDimensions 8.7 × 11.8 × 5.24 inSeems like 2 of those might be the same hardware. I wonder what that might inspire. 🥸

author: thm_w
author_rank: Super Contributor
timestamp: June 26, 2024, 10:23:59 pm
content: Quote from: exe on June 26, 2024, 06:42:40 pmFor me if designing a lab PSU for use with valves (or 6V batteries) you'd probably choose ~8V.You can look around at whats commonly available for lab PSUs: 60V, 50V, 30V, 27V, 15V, 6V, etc. Which makes sense for use on 48V, 24V, 12V, and 5V systems. 10-20% headroom.12V - 10% gives you 10-11V, which no one uses as a standard voltage.Quote from: KungFuJosh on June 26, 2024, 08:45:32 pmI added the voltage specs above. Its a completely different transformer winding I would think.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 26, 2024, 11:28:44 pm
content: Quote from: thm_w on June 26, 2024, 10:23:59 pmThat's certainly one possibility, but it's not the only possibility. Let's speculate! 😉

author: tautech
author_rank: Super Contributor
timestamp: June 28, 2024, 01:38:26 am
content: Released today June 28 2024.https://int.siglent.com/products-overview/spd4000x/https://siglentna.com/power-supplies/spd4000x-series-programmable-linear-dc-power-supply/https://www.siglenteu.com/power-supplies/spd4000x-series-programmable-linear-dc-power-supply/Datasheet attached.

author: hpw
author_rank: Frequent Contributor
timestamp: July 16, 2024, 07:23:39 am
content: Is there anySPS4000X_Service_manualseen/given yet? As the SPS5000X_Service_manual even exists already.While the Ch1/Ch4 meter alters IMHO a bit to much as cold to warm up .. and how user calibration values alters the meters.Hp

author: tautech
author_rank: Super Contributor
timestamp: July 16, 2024, 07:33:43 am
content: Quote from: hpw on July 16, 2024, 07:23:39 amNot yet.QuoteIt's been released for 3 years.https://www.eevblog.com/forum/testgear/siglent-sps5000x-psus-coming/QuoteWhich product ?

author: Kawakneurder
author_rank: Contributor
timestamp: July 16, 2024, 09:33:57 am
content: Looks like quite an interesting supply, the 4323X and 4306X especially.Noise and load regulation are exceptional for the high current output (compared to similarly priced PSUs).I am wondering about transient behavior (ex. time to switch from CV to CC mode, and residual energy in the output if it suddenly switches to CC mode).@Tautech Do you have any idea how large the output capacitance is? Or do we have to wait for a teardown from Dave

author: pdenisowski
author_rank: Super Contributor
timestamp: July 16, 2024, 10:35:36 am
content: Quote from: temperance on December 11, 2023, 11:58:12 pmMany lab power supplies have the ability to set overvoltage and overcurrent thresholds on a per channel basis - if you try to exceed the limit, the channel is disabled. This has kept me from blowing up all kinds of things over the years

author: pdenisowski
author_rank: Super Contributor
timestamp: July 16, 2024, 10:38:09 am
content: Quote from: BillyO on December 28, 2023, 03:22:16 pmDoes this count? It's only 40 amps at 20 volts ...(Please don't try this at home)

author: jjoonathan
author_rank: Frequent Contributor
timestamp: July 16, 2024, 01:41:31 pm
content: HC is a lot of fun, you get to throw sparks, melt things, and it isn't trying to jump through the air to kill you. Just don't forget your safety rag and fire extinguisher!https://youtu.be/uXEPy6Za6cI?t=218(Since it has been a decade since photonicinduction's heyday, I should probably explain the bit: the fire extinguisher was a spray bottle with water for the many times he caught the carpet on fire.)

author: hpw
author_rank: Frequent Contributor
timestamp: July 16, 2024, 03:12:43 pm
content: Quote from: Kawakneurder on July 16, 2024, 09:33:57 amTo change from any modes, the related output's have to beswitched OFF & On again.... the given cable is rated as3Awith twisting "bunch plug". Those twisting "Bunch Plug" are a culprit of no contacts/loosing contacts.In the custom calibration mode as for first use, all channel 's values V & I, needs to be carefully set !! Otherwise

author: mon
author_rank: Contributor
timestamp: July 17, 2024, 07:15:31 am
content: AppVision now has listings up for AUD pricing:SPD4323X $1,122.00SPD4121X $1,287.00SPD4306X $1,595.00Pretty comparable to the US pricing.Now I need to calm my itchy trigger finger and wait for Dave to take one apart... Would hate there to be a repeat of the SPD3000x's early unit issues.

author: hpw
author_rank: Frequent Contributor
timestamp: July 17, 2024, 08:33:25 am
content: Quote from: mon on July 17, 2024, 07:15:31 amTo note:- if you power C2 or C3 as 10V and switch on without any load, the current setting should have any value > 0.000A, otherwise no output voltage seen... setting like 0.010A shows than 10V at the meters otherwise nada.- nice would be a simple factory copy to the user calibration table, so simple to calibrate and reset user calibration to valid state.IMHO, to test the gear really, any dynamic test (comprehensive test) would be required using a good electronic load gear.

author: tautech
author_rank: Super Contributor
timestamp: July 17, 2024, 09:31:32 am
content: Quote from: hpw on July 17, 2024, 08:33:25 amNormal.As this can bluff some ppl we always dispatch with 1V 1A settings on all channels.

author: slavoy
author_rank: Regular Contributor
timestamp: July 17, 2024, 09:59:05 am
content: No info about the measurements refresh rate in the sheets

author: tautech
author_rank: Super Contributor
timestamp: July 17, 2024, 10:04:33 am
content: Quote from: slavoy on July 17, 2024, 09:59:05 amList time accuracy < 50 ms might be related.

author: pdenisowski
author_rank: Super Contributor
timestamp: July 17, 2024, 10:48:53 am
content: Quote from: hpw on July 17, 2024, 08:33:25 amYes, almost all "proper" power supply testing should be done using a high-quality electronic load.

author: 2N3055
author_rank: Super Contributor
timestamp: July 17, 2024, 11:06:46 am
content: Quote from: slavoy on July 17, 2024, 09:59:05 amCould you point me to any modern PSU by likes of Keysight and R&S that specifies that parameter?I checked 5-6 of them and not a mention...

author: pdenisowski
author_rank: Super Contributor
timestamp: July 17, 2024, 12:32:17 pm
content: Quote from: 2N3055 on July 17, 2024, 11:06:46 amCould I ask what you mean by "measurement refresh rate"? If it's how fast readback data can be logged, that definitely is in our spec sheet. We also specify the sampling time used for statistical measurements.https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_common_library/dl_brochures_and_datasheets/pdf_1/NGU_dat_en_3608-6802-32_v0201.pdfI also did an entire "technology" video explaining power supply readback and loggingand one specifically on how this is done on our NGM power supply (normal and "fast" logging)

author: 2N3055
author_rank: Super Contributor
timestamp: July 17, 2024, 01:38:29 pm
content: Quote from: pdenisowski on July 17, 2024, 12:32:17 pmWith do all respect, NGU is NOT a standard lab PSU, but an fancy/expensive SMU.It is a source/measure unit and measuring is part of primary function of the instrument.I checked for several Keysight and R&S standard PSU units and there is not even a single mention of how fast internal V/A meters sample values..Or how fast is request, measure, reply cycle time for SCPI readout, on various interfaces.

author: pdenisowski
author_rank: Super Contributor
timestamp: July 17, 2024, 03:01:30 pm
content: Quote from: 2N3055 on July 17, 2024, 01:38:29 pmPoint well taken - I just happened to have the NGU datasheet open because I was answering a question about it in another thread. That was careless of me and I apologize for not choosing a comparable supplyI'm assuming "measurement refresh rate" refers to how fast readback data values can belogged-- there is a human-perception limit with regards to how fast they can beviewedon a power supply display. If this definition is correct (and it may not be), then "measurement refresh rate" would have to refer to supplies that can log readback values -- I'm not sure that a "readback display update rate" value would be helpful or relevant.It appears that the new Siglent power supply does not support logging, so I'm not surprised that no value for "measurement refresh rate" was given. (And that's not a slam on Siglent - our comparable HMP4000 series supply also does not support logging).Many R&S basic / entry level power supplies do however support logging, and when they do, this is specified. It's not just the "fancy/expensive" oneshttps://www.rohde-schwarz.com/us/products/test-and-measurement/dc-power-supplies/rs-ngc100-power-supply-series_334248.htmlAgain, my apologies for not using a better example in my original post. Thanks for keeping me honest!

author: pdenisowski
author_rank: Super Contributor
timestamp: July 17, 2024, 03:12:19 pm
content: Quote from: 2N3055 on July 17, 2024, 01:38:29 pmUnderstood, but unless these values are logged and/or used for statistics measurements (capture a very fast spike so that Vmax reflects this), it might be a moot point. But it's a good question and I will ask our developers about this.Quote from: 2N3055 on July 17, 2024, 01:38:29 pmI don't know any manufacturer who formally specs this for any instrument. SCPI response time varies considerably based on a lot of things, so developing a methodology to compare SCPI response time specs would be very difficult.

author: nctnico
author_rank: Super Contributor
timestamp: July 17, 2024, 03:21:59 pm
content: Agilent / Keysight has SCPI response times for most of their equipment aimed for use in automated testing rigs. For example their 34461 DMMs have a throughput specification for the various interfaces. Same for the 33500 waveform generator and N3300 DC load series.

author: slavoy
author_rank: Regular Contributor
timestamp: July 17, 2024, 03:36:22 pm
content: I was just referring to the screen refresh rate, not sampling or logging. Just that simple useful thing..BTW Does spending $1100 on a power supply ensure the encoder works well?

author: 2N3055
author_rank: Super Contributor
timestamp: July 17, 2024, 04:22:16 pm
content: Quote from: slavoy on July 17, 2024, 03:36:22 pmAre you sure you are not confused about some things? Are you in the right topic? What PSU are you talking about?

author: tszaboo
author_rank: Super Contributor
timestamp: July 17, 2024, 04:59:49 pm
content: Quote from: pdenisowski on July 16, 2024, 10:38:09 amCool. Let me know when you guys made a 4000A capable, 0.003% accurate 2 and a half-ish quadrant power supply that will measure every 100us.

author: 2N3055
author_rank: Super Contributor
timestamp: July 17, 2024, 05:01:13 pm
content: Quote from: tszaboo on July 17, 2024, 04:59:49 pm

author: pdenisowski
author_rank: Super Contributor
timestamp: July 17, 2024, 08:35:37 pm
content: Quote from: tszaboo on July 17, 2024, 04:59:49 pm

author: pdenisowski
author_rank: Super Contributor
timestamp: July 17, 2024, 08:43:28 pm
content: Quote from: slavoy on July 17, 2024, 03:36:22 pmOkay, that makes senseWe definitely don't spec that. Has that been an issue for you? The reason I'm asking is even my cheapest "hobby" power supply display seems to update more or less instantaneously from a human point of view.

author: Martin72
author_rank: Super Contributor
timestamp: July 17, 2024, 08:45:11 pm
content: Here again something on the actual topic:https://www.batronix.com/shop/siglent/SPD4000X.htmlThe prices seem reasonable, but visually it's just not mine.

author: pdenisowski
author_rank: Super Contributor
timestamp: July 17, 2024, 08:53:05 pm
content: Quote from: nctnico on July 17, 2024, 03:21:59 pmIt would help if they would use the word "SCPI" when describing this in their data sheetsThe stats I could find seemed to reference primarily GPIB*, and for the 34461 they (vaguely) indicate that "VXI-11 connections may be slower" But I agree that for automation / production this would be very useful information.https://www.keysight.com/us/en/assets/7018-03846/data-sheets/5991-1983.pdfhttps://www.keysight.com/us/en/assets/7018-05928/data-sheets/5992-2572.pdfhttps://www.keysight.com/us/en/assets/7018-06712/data-sheets/5980-0232.pdf*Nothing against GPIB (I just did a video on it, as a matter of fact), but delays in GPIB are much more "deterministic" than VX11/LAN, at least in my experience.

author: pdenisowski
author_rank: Super Contributor
timestamp: July 17, 2024, 08:54:51 pm
content: Quote from: Martin72 on July 17, 2024, 08:45:11 pmFrom the video it looks like the readback update rate is somewhere on the order of 1 Hz

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 17, 2024, 08:56:15 pm
content: Quote from: Martin72 on July 17, 2024, 08:45:11 pmIt's kind of weird to see the channel numbers in order. 😉

author: TomKatt
author_rank: Frequent Contributor
timestamp: July 17, 2024, 09:01:01 pm
content: Quote from: Martin72 on July 17, 2024, 08:45:11 pmThat's some over-the-top slick marketing production work for a power supplyPersonally, I kinda like the new dark mode look. But the neon color channel buttons do stick out on that dark grey face

author: Martin72
author_rank: Super Contributor
timestamp: July 17, 2024, 10:54:01 pm
content: Quote from: KungFuJosh on July 17, 2024, 08:56:15 pmTo me, the thing looks like a toy, why can't it be designed in a more objective and functional way...

author: thm_w
author_rank: Super Contributor
timestamp: July 17, 2024, 11:24:58 pm
content: I don't get how it looks like a toy, its literally the same style as a keysight with a few more rounded edges. Colors are super practical.Quote from: pdenisowski on July 17, 2024, 08:54:51 pmYeah 1 or 2Hz, not impressive considering the cheap processing power we have these days. Though to be fair most PSUs are similar.Its almost never a hardware limitation either, just software people not optimizing or not understanding display DMA.

author: Martin72
author_rank: Super Contributor
timestamp: July 17, 2024, 11:37:12 pm
content: QuoteI didn't say that Keysight looks more “professional” to me.I'm older, I prefer a sober design.

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 18, 2024, 12:22:47 am
content: I bet somebody likes the look of a classic Agilent 6114A. 😉

author: tautech
author_rank: Super Contributor
timestamp: July 18, 2024, 12:51:26 am
content: Quote from: Martin72 on July 17, 2024, 10:54:01 pmLike how ? ?

author: jjoonathan
author_rank: Frequent Contributor
timestamp: July 18, 2024, 01:11:02 am
content: It's missing the Keysight racecar stripe.I am waiting for one with flame decals on the side.

author: slavoy
author_rank: Regular Contributor
timestamp: July 18, 2024, 06:02:42 am
content: Quote from: pdenisowski on July 17, 2024, 08:43:28 pmIf its slower than 3Hz, for me, yes. I consider 5Hz to be optimal.Quote from: thm_w on July 17, 2024, 11:24:58 pmIMHO, there's nothing wrong with the colors themselves. To me, it doesn't look like a toy. More like it's recycled, old from the start or they ran out of dye. Take a good look: It's not black; it's worn out black-yellow-brownish. Why not going for full black instead

author: tszaboo
author_rank: Super Contributor
timestamp: July 18, 2024, 10:14:40 am
content: Quote from: pdenisowski on July 17, 2024, 08:35:37 pmI know it sounds silly, but all the specification for that project was customer driven.German EV standards defined that battery packs ESR had to be measured with 10C discharge, so if you have a 300Ah battery pack, you needed to discharge it with 3000A. We had this 80 channel battery tester, 50A per channel, and you could place all the channels in parallels. The rest of the specifications, they also had very good reasons to measure coulombic efficiency, or to be able to discharge a battery to 0V.Disclaimer, I only did the analogue boards for the project.And I thought we are doing the the one-uppmanship.

author: mawyatt
author_rank: Super Contributor
timestamp: July 18, 2024, 02:37:54 pm
content: The color can be misleading as it's rendered by the camera and image post processing, then on your monitor. If your monitor is not one of the expensive "Calibrated" types (or Calibrated with a proper device), then it's difficult to determine the actual precise color.Edit: Just took a look at our SDS800X HD, it's the "Dark" color and if the SDP is the same, then it does have a brownish tint to our eyes, whereas the Keysight "Dark" has a charcoal with a slight blueish tint.Personally think this new PS looks fine, also like that Siglent has "listened" to users and placed the Terminals at standard spacing (keeping with color coding the ends like previous models), and included a numeric keypad, all per user/complainer inputsOne will soon find out that without color coded terminal ends it's very easy to mis-plug the connections when the PS is straight on (~level with the eye). Results can be disaster in the waiting, don't ask how we know!! Our GPP-4323 has this problem and we used Acrylic Paint to color the terminal ends, after an "Experience"!!Also Siglent has included Remote Sensing to the main channels, this is a welcome addition as one can create a custom cable that senses at the cable ends. This allows one to "Cheat" and use a smaller core cable and still deliver the proper voltage to the DUT without worry for cable drop.Best,

author: 2N3055
author_rank: Super Contributor
timestamp: July 18, 2024, 02:42:37 pm
content: Quote from: mawyatt on July 18, 2024, 02:37:54 pm

author: mawyatt
author_rank: Super Contributor
timestamp: July 18, 2024, 02:52:57 pm
content: Quote from: 2N3055 on July 18, 2024, 02:42:37 pmDon't laugh, that "Episode" cost a few $ and some choice words directed at the GPPThen the finger pointed back at ourselves as the true culpritBest,

author: Furna
author_rank: Frequent Contributor
timestamp: August 03, 2024, 10:59:46 am
content: I am a little bit disappointed by the cables' quality ...Those plastic cover over the cocodrile will squish all around the places ... I would have preferred something likeI didn't powered it on yet ... have to finish to cable the LAN (damn I am out of ports on the switch after this boy!)

author: dirtcooker
author_rank: Regular Contributor
timestamp: September 04, 2024, 03:39:44 am
content: The SPD4323X has most of the features I am looking for except one. It seems to be missing a dual tracking feature. If you put channels 2 and 3 in series, the manual states"In the series mode, the voltage value is twice compared with that of single channel. CH2/3 are linked internally into one channel which is controlled by CH2, and CH2 reads the parallel (sic) voltage and current values....3.Connect the load to the terminals on the front panel: CH2+ & CH3-. "So what if your using this as a +- supply, and you want to know the +- currents, and possibly set different values. Am I missing something? Does anyone have one of theses to check?

author: tautech
author_rank: Super Contributor
timestamp: September 04, 2024, 03:55:09 am
content: Quote from: dirtcooker on September 04, 2024, 03:39:44 amSPD3303X in Series mode works as a+dual tracking PSU and I don't see why SPD4000X won't too.Just take your 0V from one of the center terminals.ie, the Neg of Ch2/Pos Ch3 becomes the 0V rail and Ch2 Pos is + supply, Ch3 - is the negative supply.You can also setup something similar with an external link in independant output mode and limit the current on each rail.I'll have some SPD4000X in the next few weeks to confirm.

author: dirtcooker
author_rank: Regular Contributor
timestamp: September 04, 2024, 12:52:18 pm
content: "SPD3303X in Series mode works as a+dual tracking PSU and I don't see why SPD4000X won't too."makes sense that it would. But I am wondering if the current/voltage readback is disabled for CH3 when in series mode. The manual states: “4W sense mode is not supported in series or parallel mode.” I wonder why not.I am comparing this model to the Instek GPP-4323 and the Keysight E36313A (which of course is 3x the price of this) Reportedly with the instek: “one of the main channels reads 3.3mA, the other 2.2mA even if nothing is connected to the output” (https://www.eevblog.com/forum/testgear/gw-instek-gpp-4323-422471/msg5426795/#msg5426795)That would be unacceptable. I'm working on a battery powered device so I want the meter readings to be accurate.

author: tautech
author_rank: Super Contributor
timestamp: September 04, 2024, 01:10:08 pm
content: Quote from: dirtcooker on September 04, 2024, 12:52:18 pmIt's not in the 3000X models, Ch1 is the master control but they track together.We need somebody with one to perform some tests for you.....Have you tried your local guys ?Kemp Instruments972-437-9100www.kempinstruments.comdallas@kempinstruments.comOr maybe call NA HQ and have a chat to a tech there:Siglent Technologies NA, Inc.6557 Cochran Rd Solon, Ohio 44139Tel: 440-398-5800Toll Free:877-515-5551QuoteGood find and makes sense.How would it be configured into the existing rear Sense inputs ?

author: Furna
author_rank: Frequent Contributor
timestamp: September 04, 2024, 04:29:47 pm
content: Quote from: tautech on September 04, 2024, 01:10:08 pmI have a SPD4121X ... let me know exactly what test you would like to be performed and I will try ...Quote from: tautech on September 04, 2024, 03:55:09 amWill be good to make some confrontation ... what I am seeing on CH1 and CH4 is "unexpected" and before posting I would like to have some confirmation.

author: dirtcooker
author_rank: Regular Contributor
timestamp: September 04, 2024, 09:18:34 pm
content: I have a SPD4121X ... let me know exactly what test you would like to be performed and I will try ...With Ch2 and CH3 in series mode and set to, say, 5v each, place a 100 ohm resistor across CH2 and a 50 ohm resistor across CH3. the current in CH2 should read 50ma and in CH3 should be 100ma. Now set the current limit to 50ma. what is the voltage across ch2 and across ch3? the Voltages should track.

author: dirtcooker
author_rank: Regular Contributor
timestamp: September 04, 2024, 09:26:56 pm
content: Quote from: tautech on September 04, 2024, 01:10:08 pmCH2 and 3 sense inputs would be connected across the loads as usual. Why wouldn't 4W sense be available in a dual tracking power supply? CH2 and 3 are independent and fully floating, and 4W sense would complete the feedback loop to compensate for cable loss.

author: tautech
author_rank: Super Contributor
timestamp: September 04, 2024, 09:28:19 pm
content: Quote from: Furna on September 04, 2024, 04:29:47 pmEngage Series mode (for Ch2&3)Adjust any parameter and observe Set values for these 2 channels, they should track.Confirm with DMM measurements between Ch2 Pos, Ch2 Neg/Ch3 Pos (0V) and Ch3 Neg provides a dual polarity tracking supply.Exit Series modeFit link between Ch2 Neg/Ch3 Pos and confirm link as 0V and each channel can be adjusted independently for a non-equal+supply with V and A independently adjustable.TIA

author: tautech
author_rank: Super Contributor
timestamp: September 04, 2024, 09:29:57 pm
content: Quote from: dirtcooker on September 04, 2024, 09:26:56 pmNot when in Series mode.

author: dirtcooker
author_rank: Regular Contributor
timestamp: September 04, 2024, 11:14:25 pm
content: Quote from: tautech on September 04, 2024, 09:29:57 pmyes, and that's why I think it does not have a dual tracking mode. series mode is simply intended to double the voltage capability, as the manual says "CH2/3 are linked internally into one channel which is controlled by CH2". The keysight has 4 modes: auto series, auto parallel, independent, and tracking. I will check with my local NA distributor, good idea. I hope I'm wrong. I really like Siglent gear and have bought a lot of it. Great engineering, build quality and value for money.

author: tautech
author_rank: Super Contributor
timestamp: September 04, 2024, 11:24:05 pm
content: Quote from: dirtcooker on September 04, 2024, 11:14:25 pmWhile not specifically called a Dual tracking mode, while in Series mode and the center point tapped off as 0V, they behave as a dual tracking PSU.I wondered about this a while back and dragged out a SPD3303X to check.....

author: dirtcooker
author_rank: Regular Contributor
timestamp: September 04, 2024, 11:35:48 pm
content: Quote from: tautech on September 04, 2024, 11:24:05 pmThe difference is that now there are relays inside that connect the outputs in series or parallel, which is a nice feature. The keysight does this too and that is why it has 4 distinct modes.

author: tautech
author_rank: Super Contributor
timestamp: September 05, 2024, 12:03:46 am
content: Quote from: dirtcooker on September 04, 2024, 11:35:48 pmFYIAll multichannel SPD models use internal relays for Series and Parallel modes.

author: Furna
author_rank: Frequent Contributor
timestamp: September 05, 2024, 06:43:22 am
content: Unfortunately I have no time to write down here the results, but I wanted to share asap and hopefully images below are self explanayory.Will be able to better comment later after work.Quote from: dirtcooker on September 04, 2024, 09:18:34 pmIMG_20240905_073129 - Copy.png => All channels off, V and A set to casual values on CH2 and CH3IMG_20240905_073140 - Copy.png => CH2 and CH3 set to Series, set to 10V and 1.050A; CH3 is not adjustable at allIMG_20240905_073203 - Copy.png => 100Ω resistor on CH2 and 50Ω on CH3. CH2 showstotalvolatge and correct A; CH3 showschannelvoltage and correct A. It is not possible to set any value on CH3IMG_20240905_073409 - Copy.png => lowering current to 0.050A on CH2 produces no effect on either channel as expectedIMG_20240905_074357 - Copy.png => lowering current to 0.045A on CH2 produces lower voltage on CH2 (4.5V) but no change on CH3; CH2 continues to showtotalvoltageVoltages have been checked with external DMM and their values as shown in the images/reported by me are correct.dirtcooker is right

author: dirtcooker
author_rank: Regular Contributor
timestamp: September 07, 2024, 03:52:47 am
content: Quote from: Furna on September 05, 2024, 06:43:22 amThank you Furna. It appears that series mode was intended only to extend the voltage range of the power supply. Siglent really needs to add a dual tracking mode. Possibly they could do it with a firmware change only. It seems a glaring omission to me. Also in your first pic with all outputs off, ch3 reads 1ma. So do I have to add an external multimeter if I want an accurate reading in the low ma ranges? I can do that already with any old plain vanilla power supply I have kicking around. What I'm looking for is a power supply that includes a precision multimeter. That is what Keysight has done and I think Siglent would have been wise to follow their lead.

author: hpw
author_rank: Frequent Contributor
timestamp: September 07, 2024, 09:34:33 am
content: Just to draw my suggestions again:- come up with the service manual (after month still missing), to see how to calibrate using the customer mode- provide a simple menu as: Copy factory setup to customer mode as to get a nice valid setup to alter- colored cables related to current channel colors, otherwise as 4x pairs to follow the cables or even to label- describe why to provide some current otherwise output shutdown as may the meters requires some small currents- yes a tracking mode as RIGOL has is a must have

author: Furna
author_rank: Frequent Contributor
timestamp: September 08, 2024, 09:38:14 am
content: First of all: never ever takes measurement early in the morning when you just wake up, still didn't drink a coffee, and in a rush to go to work ...Quote from: Furna on September 05, 2024, 06:43:22 amCurrent waslowered to 0.040Aas the image clearly shows.Let's start with something simple: series mode with dummy load across CH2+ and CH3- ... volatges have been verified with external multimeter (BM869s calibrated in March 2024) at PSU outputsIMG_20240907_114815.png - the setup; 100Ω resistor measuring 100.34Ω (yes wire wound resistor; this is what I have at the moment for 100Ω).IMG_20240907_115035.png - series mode 10V and 1.5A set; as expected 0.1A, 10V total with 5V on each channel. I have no idea why CH3 shows 0.101A; alsoI am not able to reproduce this today.IMG_20240907_115452.png - voltage reduced to 9V; as expected 0.090A, 9V total and each channel at 4.5V. Still CH3 shows 0.001A more.IMG_20240907_115810.png - voltage back to 10V, let's start to reduce current to 0.090A to go to CC mode. To get desired current, voltage is reducedonlyon CH2 but still higher than expected even considering the not exact value of the resisotr; CH3 shows his own correct voltage while CH2 shows the total voltage.IMG_20240907_120216.png - lowered current to 0.050A ... behaviour confirmed. CH2 almost at 0V with same kind of error as previous image.IMG_20240907_120335.png - lowered cuurent at 0.040A ... CH2 goes to -0.6V but that is not enough; to have 0.040A we should have CH2 at -1V but pag15 of the manual "The high current channel support remote voltage compensation sense function. Themaximum compensation voltage is 0.6V". Displayed values for CH2 are completely wrong now.IMG_20240907_120950.png - lowered cuurent at 0.010A ... CH2 goes to -0.7V (contradcting the manual) but it should be -4.0V. Values shown on CH2 are completely wrong. Values shown on CH3 are correct.I understand this is a corner situation ... every intelligent person would use the independent mode for such low V and A vlaues but definitely the serial mode could be improved in the firmware.Expecting your comments folks.

author: dirtcooker
author_rank: Regular Contributor
timestamp: September 08, 2024, 01:46:57 pm
content: Quote from: Furna on September 08, 2024, 09:38:14 amIt all falls apart at the 40ma setting, when I would expect ch2 to read 4v (total) and ch3 to read 2v. Is 4W sense turned on, or is it greyed out since the manual says it is not supported in series mode? You have found a bug in the series mode with this simple test. Maybe Siglent could supply a schematic so we can help debug their power supply.

author: Furna
author_rank: Frequent Contributor
timestamp: September 08, 2024, 02:38:10 pm
content: Quote from: dirtcooker on September 08, 2024, 01:46:57 pmIt seems the strategy (that I do not understand) is to change/lower voltage on CH2 only ... to the point where the firmware authors choose to apply a negative voltage to CH2 instead of lowering CH3 too.QuoteIf 4w is on, you cannot enable parallel/series; if parallel/series is on, you cannot enable 4w.QuoteI doubt Siglent will share the schematic ... I hope @tautech will have the chance to signal Siglent the bug(s) we will find.

author: tautech
author_rank: Super Contributor
timestamp: September 09, 2024, 08:27:37 am
content: Quote from: Furna on September 08, 2024, 02:38:10 pmWhen they arrive myself and Defpom whom is to get one will look carefully at how Series and Parallel modes work. Some weeks away....

author: Furna
author_rank: Frequent Contributor
timestamp: September 09, 2024, 04:18:34 pm
content: Quote from: tautech on September 09, 2024, 08:27:37 amI am sure you guys will have a far better structured approach at testing these PSU; anyway if you need some "work force" to perform a few tests, just let me know.

author: mon
author_rank: Contributor
timestamp: September 09, 2024, 09:28:35 pm
content: I'm certainly interested what you think of the PSU so faroutsideof the issues with the channel linking.

author: Furna
author_rank: Frequent Contributor
timestamp: September 10, 2024, 05:17:52 pm
content: Quote from: mon on September 09, 2024, 09:28:35 pmWhat I think about the PSU in general ...When I ordered it, I was conscious it was a bet; there are other issues I currently do not have intention to share yet since I want to leave tautech and Defpom the "exclusivity" of being the first to review the PSU (for sure they are more experienced tah me both as technicians and as reviewers).The build quality is very good and until now I found the precision pretty accurate and always in spec when measured with BM869s considering also the error margin of this one of wich I have calibration data.I already mentioned the quality of the included cables; while I was really disapointed at the beginning, I am now getting somehow used but I also have and use a set of alternative cables.Moreover, cheap for cheap Siglent could have included 4wire sense cables (indeed you need to provide yourself).The user manual needs a fresh clean up from copy&paste and English mistakes, but it is easily understandable.All in all I am confident Siglent will release new firmwares and fix the issues and my bet will be a succesfull one ...BTW did anyone noticed the camera icon just next to Save/Recall button clearly visible in my images?It is not present in the marketing material and in the user manual too ... but it is there on the real product ... should we expect a new firmaware where you can save the dispaly?Quote from: KungFuJosh on June 26, 2024, 11:28:44 pmSee the attached image ...I didn't take it apart but it might be that the transformer is shared between SPD4121X and SPD4306X

author: Furna
author_rank: Frequent Contributor
timestamp: October 02, 2024, 04:56:43 pm
content: Quote from: tautech on September 09, 2024, 08:27:37 amHow many weeks? Any news? What model(s) are you going to receive?

author: tautech
author_rank: Super Contributor
timestamp: October 02, 2024, 09:22:11 pm
content: Quote from: Furna on October 02, 2024, 04:56:43 pmThey're on the water so waiting impatiently.......Top and bottom models are coming, not the middle one at this time.

author: Furna
author_rank: Frequent Contributor
timestamp: October 02, 2024, 09:35:25 pm
content: Quote from: tautech on October 02, 2024, 09:22:11 pmAre you also going to teardown them?I have the middle one so we are covered ... if I get courious enough and have something to compare to, I could teardown mine.I do not have a pro setup for photos/videos tough.

author: tautech
author_rank: Super Contributor
timestamp: October 02, 2024, 09:42:14 pm
content: Quote from: Furna on October 02, 2024, 09:35:25 pmDefpom will get one to have a good look at.

author: jayk
author_rank: Regular Contributor
timestamp: October 04, 2024, 04:25:18 pm
content: Will be interested to hear about the web interface on these. The GPP-4323 is great but has a crap web interface. Hopefully Siglent did a better job with the SPD4000X.

author: Furna
author_rank: Frequent Contributor
timestamp: October 05, 2024, 08:43:18 am
content: Quote from: jayk on October 04, 2024, 04:25:18 pmAn image is better than 1000 words?

author: mawyatt
author_rank: Super Contributor
timestamp: October 05, 2024, 03:09:55 pm
content: Could you do some of the tests discussed here:https://www.eevblog.com/forum/testgear/power-supply-for-home-lab-do-i-really-need-a-rs/Specifically with a Voltage and Current Limit of 20V and 10mA respectively using a Blue LED as load DUT. Record Turn On Characteristic of Voltage (or Current) at DUT.Also do the above with Voltage Limit of 8V and 50Ω DUT.The GPP-4323 seems to be the best of the bunch.Thanks in advance if you have the timeBest,

author: folays
author_rank: Contributor
timestamp: October 05, 2024, 10:18:01 pm
content: SPD4306X ; set to 0.020 A.3 screenshoots : 5V / 10V / 20V.Green led, vendor says Vdrop=2.2V 20mA.The green leds didn't like that. 3 are dead, some are more resilient. They flash yellow at 20V, but some still continue to work.Sorry it's only a scope measurement of Voltage at the led terminals.3V per horizon div, 2ms per horizontal div.At 20V, the SPD in CC=20mA settles at 3.2V.I will insert a resistor in series to measure current.

author: folays
author_rank: Contributor
timestamp: October 05, 2024, 10:36:13 pm
content: Here is fresh green led (not one I martirized before) at 3V / 5V / 10V / 20V.The resistor is a really cheap one marketted as100Ohm but real BM869's measured resistance was~ 90.00 Ohm.For what is worth, wiring is : Vcc -> pushbutton -> Led -> Resistor -> Ground.I didn't connected the SPD "sense" leads, but I had the BM869s measuring Vcc at the breadboard, got .00 decimals at each of the 4 voltage ranges.Here are 4 traces at 50ms / div.The yellow C1 trace is the SPD4306X Voltage.C2 (not displayed) is the resistor Voltage drop.F2 (math) is C1/90 ; so that's the current. At 30 mA / div.At 20V, the current peaked at 169mA.Bonus 5th picture at 20V and 10x more zoom (5ms / div).Beware the vertical division of Amperage has changed, it is now 50mA / div.Peak start at 170mA, after 45ms it seems to be still at ~120 mA.

author: mawyatt
author_rank: Super Contributor
timestamp: October 05, 2024, 11:44:15 pm
content: You want to be using the ON/OFF Enable Button on the Supply, not an external Push Button. The Push Button places the PS output capacitance fully charged to set voltage across the DUT. At higher set voltages like 10 and 20V this will damage/destroy the LED as too much energy gets dumped into the DUT LED.Best

author: folays
author_rank: Contributor
timestamp: October 06, 2024, 12:48:05 am
content: Here using the button of the SPD.I missmeasured the resistance (for calculating the current) it is 99 Ohm, also checked with Shannon's tweezers.F2 = Vresistance / 0.099 Ohm (scope wouldn't let me graph F2 below 5mV/div at 3mV/div so I divided by 0.099 to graph in V/div).F2 Rise slowly to 19+ V, it means 19mA, as set on CC supply (20mA).I like the fact that we can see the current rising once we approach the Vdrop of the LED.

author: tautech
author_rank: Super Contributor
timestamp: October 06, 2024, 12:57:48 am
content: Quote from: folays on October 06, 2024, 12:48:05 amQWhy have you not set the scope to show A with the correct scaling ?Hint, look in the channel menu.

author: folays
author_rank: Contributor
timestamp: October 06, 2024, 01:28:01 am
content: QuoteThe Math channel can't let me set the unit on it, Ohm's law doesn't exist, and if Math channel divides Volts by Resistance, then Scope law's which is above Ohm's law mandates that the result is still VoltsI could force Math channel to be in Amp, if I were to set the C2 (Vdrop at the resistance) to be Amps.I very would like to be able to change the Math channel independently, or if the scope would let just enter a suffix string.I've entered the Steinhart-hart equations in a math channel for the fun, and I had to display the temperature in V.QuoteThe C2 channel was set a 1V/div.F2 was set at F2=C2/99 (99 Ohm).So I indeed had the target LED's 20mA, but displayed as 20mV, but if I changed the C2 unit from V->A, then I could have F2 change from mV->mA.But I wanted the current (~20 mA, or 20mV badly displayed) to be graphed with the 7 full spans on division available in the positive range.so 20m[A or V] divided by 7 = roughly 3 wheen rounded to ceil.So I wanted to set F2 to 3 mV vertical div,but the scope wouldn't let me go below 5mV. Without any message, even if I had the "coarse" unchecked, when I entered something below 5milli, it raised it up to 5milli.Attached is a picture when I set back F2=C2/99, then I can't set F2 vertical div to below 5mV. When I lower it, it ignores it and briefly writes a big 5mV in White in the bottom center of the screen.So I changed F2 from F2=C2/99 to F2=C2/0.099 and set the vertical div of F2 from 3mV(impossible minimum 5mV) to 3V.Ah and in the oddities, the Steinhart-hart equation is something along :Code:// let a, b, and c be three coefficients which to me, may as well have been determined by black magicF3=ln(voltage)// natural log, not log10 // F4 and math channels have a string length limit, so I have to use a temporary channel to reduce sizeF4=a + b*F3 + c*F3*F3*F3The scope wouldn't allow have F3 be cube'd to the power of 3.So It worked with the mathematically-equivalent of factorized :Code:F4=a + F3*(b + c*F3*F3)And somehow it accepted it, like if we weren't anymore be ^3 a chan source.I guess that it comes from limit in the math operations accepted by whatever chips calculate the maths (FPGA ?).Probably the FPGA cannot do F3*F3*F3, probably it can do F3*F3*(F3+0). Or something along those lines.I guess square/square root are often used in the electrical domains, cube/cube root less often, and I wanted to ^3 but it was for something probably rarely usefull on a scope.

author: mawyatt
author_rank: Super Contributor
timestamp: October 06, 2024, 01:48:01 am
content: Can't you just set the CH2 Units toAmps, the Probe to proper V/A? The DSO will then display in mA100Ω is large for current measuring, as 100Ω * 20mA = 2V. Try 1 or 10Ω for less voltage drop, your nice DSO should have plenty of low noise sensitive to handle this.Best

author: KungFuJosh
author_rank: Super Contributor
timestamp: October 06, 2024, 01:56:52 am
content: Probably should put the 20M channel filter on too.

author: folays
author_rank: Contributor
timestamp: October 06, 2024, 02:15:35 am
content: C2 set to A, with 20M filter.C2 measured Vdrop changed to ~ 1.53 Ohm.Still at 5mA div on F2, cannot set it below to 3mA per div.

author: Furna
author_rank: Frequent Contributor
timestamp: October 06, 2024, 11:13:09 am
content: Quote from: mawyatt on October 05, 2024, 03:09:55 pmHi,this what I have been able to do so far.Setup: SPD4121X- 2*100Ω wire wound cement resistor in parallel => 50Ω (see IMG_20241006_125209.png)- CH1 8V - 0.010A- CH2 8V - 0.010AResults:- CH1 overshot to 3.48V => 0.0696Ω (see CH1-8V-10mA-50R-20msec.png)- CH1 overshot to 3.48V => 0.0696A (see CH1-8V-10mA-50R-20msec.png)- CH1 recover to to 0.50V in about 30msec (see CH1-8V-10mA-50R-50msec.png)- CH2 overshot to 1.32V => 0.0264Ω (see CH2-8V-10mA-50R-20msec.png)- CH2 overshot to 1.32V => 0.0264A (see CH2-8V-10mA-50R-20msec.png)- CH2 recover to 0.50V in about 90msec (see CH2-8V-10mA-50R-50msec.png and CH2-8V-10mA-50R-100msec.png)So the "issue" is present on SPD4000 series too, anyway with lower magnitude if I read correctly the other posts.CH2 overshots less than half than CH1 but recovers much slower, anyway much faster than 12 sec I read in other posts.Give me some time to better read the posts and see if I have a spare blue LED around.Edit: I clearly made a copy and paste error mixing Ω and A ... sorry for misleading

author: mawyatt
author_rank: Super Contributor
timestamp: October 06, 2024, 12:38:56 pm
content: Thanks Furna, interesting results!!Think starting a new thread on Power Supply Turn ON and OFF characteristics might be in order to consolidate the various efforts of folks on this issue.Best,

author: Furna
author_rank: Frequent Contributor
timestamp: October 06, 2024, 01:35:54 pm
content: Setup: SPD4121X- Generic Blue LED (see IMG_20241006_151727.png)- CH1 12V - 0.010A- CH2 12V - 0.010AResults:- CH1 overshot to 3.48V => PSU shows 2.840V 0.0.10A in long run (see CH1-12V-10mA-BlueLED-10msec.png and CH1-12V-10mA-BlueLED-50msec.png)- CH2 no overshot => PSU shows 2.840V 0.0.10A in long run (CH2-12V-10mA-BlueLED-10msec.png and CH2-12V-10mA-BlueLED-50msec.png and CH2-12V-10mA-BlueLED-500msec.png)Awaiting commentsPS SPD4121X CH2 max voltage is 12VFor this reason I choose to use 12V for all tests with Blue LED

author: mawyatt
author_rank: Super Contributor
timestamp: October 06, 2024, 01:41:38 pm
content: Thanks FurnaInteresting how the two channels differ in details!!Edit: BTW we don't see this with the SPD3303X, see link below.Note the thread started here.https://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/Best

author: MildInductor
author_rank: Regular Contributor
timestamp: October 07, 2024, 02:58:19 am
content: Quote from: Furna on October 06, 2024, 01:35:54 pmIs this overshoot likely to damage any general IC circuitry? Say if I was supplying 3.3V to a general purpose IC that was only rated to operate up to 3.3V. Would the spill over be enough to damage it generally speaking?

author: Furna
author_rank: Frequent Contributor
timestamp: October 07, 2024, 08:44:41 am
content: Quote from: MildInductor on October 07, 2024, 02:58:19 amIt depends on the circuitry; some components are more tollerant than others.Also it is not the voltage to damage a circuit; it's the current. And SPD4000X is not the worst in the class (note CH2 didn't overshoot).Anyway here we are in a very corner case where we are testing different PSU (seehttps://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/) deliberating pushing a high voltage and limiting the current to check how fast the over current protection kicks in.IMHO this is not a factor to keep in consideration while choosing a PSU; it's a fact to be aware while using the PSU.As a general rule: you should be aware of what you are going to supply current to and how tollerant it is and set up your PSU accordingly.Sure we are human and here the over current protection ... but if you are powering a super expensive prototype circuit you will double take any precaution.

author: ArdWar
author_rank: Frequent Contributor
timestamp: October 07, 2024, 09:38:11 am
content: Quote from: MildInductor on October 07, 2024, 02:58:19 amWith regards to this specific exercise, no. It should not damage your circuit IF you use your PSU in constant voltage mode.The aforementioned overshoot only happen (so far) when PSU are configured (and expected) to startup directly into constant current mode. That isn't exactly normal nor usual mode of operation.Even then, you normally shouldn't set the CV setpoint that far high (say, 8.0V here) when you expect your I*R product to never get that high (say, 40mA*50Ω = 2.0V here). In this situation a sensible user should set the CV setpoint at something like 3.0V.

author: MildInductor
author_rank: Regular Contributor
timestamp: October 07, 2024, 12:15:19 pm
content: I see, thank you both!

author: mhsprang
author_rank: Regular Contributor
timestamp: October 07, 2024, 12:49:43 pm
content: Quote from: ArdWar on October 07, 2024, 09:38:11 amWhy isn't that a normal mode of operation? It is, after all, advertized as one of the modes a PSU can operate in. CV means "constantvoltage" whereas CC means "constantcurrent". What makes the meaning of constant different in both definitions?Quote from: ArdWar on October 07, 2024, 09:38:11 amBut what if I don't know the expected maximum voltage? I'll give you a real life example: I once had to repair a small heater that looked like a wood stove. This heater contained a string of orange LEDS, to light the fake flames. This string was connected to mains using a big ceramic resistor that got flaming hot and eventually burned. To find out the proper value of this resitor, I needed to push 20 mA through the string of LED's without knowing the actual VFWDand the number of LED's in the potted piece of plastic. In that case, I could have taken a power supply, set to CC at 20 mA, connect the LED and hit the Output button in order to read the total VFWDof the entire string. Is that such an odd application of a PSU?And with some of the PSU's in this thread, I could have blown all the LED's, hypothetically.

author: 2N3055
author_rank: Super Contributor
timestamp: October 07, 2024, 01:08:34 pm
content: Quote from: mhsprang on October 07, 2024, 12:49:43 pmYou couldn't because you probably would not have enough voltage to light them in a first place.As to good practice, you would set voltage to some low value and set 20mA.Connect DUT, enable output and slowly ramp up the voltage...

author: mawyatt
author_rank: Super Contributor
timestamp: October 07, 2024, 01:17:22 pm
content: Quote from: MildInductor on October 07, 2024, 02:58:19 amOvershoot Voltage can and will damage/destroy certain components, of coarse this depends on the component and amount of Over Voltage. CMOS failure is caused by gate oxide puncture, many of today's advanced chips have very thin and hence low breakdown oxides (some BJTs have thin base regions). 2 decades ago we were dealing with custom chips that ~3 volts would certainly destroy, they normally operated at ~1.2 volts!!Another potential effect is when Current Limit is engaged such as the discussion mentioned here:https://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/Anyway, IMO ANY Overshoot Condition is a potential disaster in the waiting. A perfect Power Supply should not Overshoot during Turn ON or Turn OFF under any conditions. Actual supplies will deviate from perfect behavior is various ways, some better than others.Best

author: mawyatt
author_rank: Super Contributor
timestamp: October 07, 2024, 01:25:37 pm
content: Quote from: 2N3055 on October 07, 2024, 01:08:34 pmGood advice with any unknown DUT situationWith known DUT and developmental work (what we mostly do/did) we almost always set the Overcurrent (CC) Limit to slightly above normal (expected) current draw and the Voltage (CV) to the desired operating voltage. We've been "saved" by this procedure more times than we care to admitBest

author: ArdWar
author_rank: Frequent Contributor
timestamp: October 07, 2024, 01:28:39 pm
content: Quote from: mhsprang on October 07, 2024, 12:49:43 pmI should've word it better, what I meant is that direct into CC is not exactly commonly used feature. And the problem mentioned above is not "normally" appliable to the use case presented in the posted question.Yes I agree that proper CVANDCC is expected (and should be guaranteed) mode of operation, but CV is by far the more common usage and is the one that applies to the posted question, and so far no decent PSU fails so bad that it violate CV setpoint.To put it simply, the particular problem discussed here isnotwhere you set your PSU at 3.3V and it somehow overshoot to 8.0V. It is where you set 10mA and it somehow go all the way to 160mA.

author: Furna
author_rank: Frequent Contributor
timestamp: October 07, 2024, 04:41:38 pm
content: Quote from: mawyatt on October 07, 2024, 01:17:22 pmExecess ofcurrentdue to the Overshoot Volatge can and will damage/destory certain components ...

author: mawyatt
author_rank: Super Contributor
timestamp: October 07, 2024, 04:49:37 pm
content: Quote from: Furna on October 07, 2024, 04:41:38 pmActually the overvoltage can without much current at all. CMOS Gate Oxides fail due to voltage, they are so thin today, a few atoms thick, that it doesn't take much voltage (or current) to puncture the oxide and cause a failure, and in it takes very very little current for this puncture to happenBTW BJTs are also susceptible, altho they tend to take more current as the usual failure mode is localized heating. A couple decades ago we were dealing with 400~500GHz SiGe BJTs in a BiCMOS process that had junction breakdowns below 2V, you could fry these by just looking at them it seemed....exteremely sensitive to any over voltage.Of course as always YMMV!!BestBest

author: seajayshore
author_rank: Contributor
timestamp: October 07, 2024, 04:58:10 pm
content: Looking forward to a video review on these! They look great on paper!

author: Furna
author_rank: Frequent Contributor
timestamp: October 07, 2024, 05:41:36 pm
content: Quote from: mawyatt on October 07, 2024, 04:49:37 pmLet me insistVoltage does not flow, Voltage is potential difference or as Fluke states "Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop"https://www.fluke.com/en/learn/blog/electrical/what-is-voltageWikipedia "Voltage, also known as (electrical) potential difference, electric pressure, or electric tension is the difference in electric potential between two points."https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://en.wikipedia.org/wiki/Voltage&ved=2ahUKEwiNiNjl5_yIAxW9cfEDHUD3Id4QFnoECDwQAQ&usg=AOvVaw313bQM2LG1bdUNXXllrJqEEven a smal potential difference might make an electron moves.Electrons move and can damage things

author: mawyatt
author_rank: Super Contributor
timestamp: October 07, 2024, 09:16:38 pm
content: Quote from: Furna on October 07, 2024, 05:41:36 pmYes electrons move and can damage things, and how much current is a few electrons moving thru a thin oxideBest

author: MildInductor
author_rank: Regular Contributor
timestamp: October 09, 2024, 04:34:17 am
content: My SPD4323X has arrived. From playing with it for a few moments it seems to be a good product overall. The buttons and encoder don’t feel as high quality as my SDS800X-series scope, but they are definitely useable. I am keen to start using it!

author: Furna
author_rank: Frequent Contributor
timestamp: October 09, 2024, 05:40:44 pm
content: Quote from: MildInductor on October 09, 2024, 04:34:17 amEnjoy it but move it on the bench; can't see it on the floor!Indeed I like the "clicky" encoder.Share your opinion soon.

author: Furna
author_rank: Frequent Contributor
timestamp: October 09, 2024, 05:50:27 pm
content: Quote from: mawyatt on October 07, 2024, 09:16:38 pm1eV=1.602*10^-19 J1=6.25*10^18 electronsQ= algebric sum of electrical charges... anyway I have to admit I am not aware of phisical characteristics of oxide.

author: mawyatt
author_rank: Super Contributor
timestamp: October 09, 2024, 06:38:56 pm
content: Quote from: Furna on October 09, 2024, 05:50:27 pmModern CMOS gate oxide layers are ~1nm thick. One electron per microsecond is 150fA, or 0.15pA. Oxide breakdown occurs 1st with a soft nature, then hard breakdown occurs. Soft is when a localized gate oxide conductive path is formed (soft failure device degradation), hard is when this becomes permanent (hard failure device destruction). The effective current levels for these effects are very small!!Anyway, we should start another topic on this and not disrupt this thread about the new SPD4000X.Best

author: tautech
author_rank: Super Contributor
timestamp: October 19, 2024, 09:08:59 pm
content: New firmware for SPD4000X models.Version： V4.1.2.8R1400kBhttps://int.siglent.com/upload_file/zip/firmware/Power_Supply/SPD4000X_4.1.2.8R1_EN.zipRelease notes1. The flag font in CC state is changed to red.2.In case of channel output, Press the aLL key to disable All ON/OFF output, and then press the All ON/OFF key to enable four output channels.

author: Furna
author_rank: Frequent Contributor
timestamp: October 19, 2024, 10:50:14 pm
content: Quote from: tautech on October 19, 2024, 09:08:59 pmThank you for sharing; I should receive the info from the newsletter but it's nice to have a very timing information from you!Indeed it is dated 14th of October on Siglent EU websiteQuote from: tautech on October 19, 2024, 09:08:59 pmI think this is good; it make more clear the switch from CV to CC ... if I got it correcltly.Quote from: tautech on October 19, 2024, 09:08:59 pmNot sure I like this ... currently I can power on a channel and in a second moment power on all the remaining 3.

author: tautech
author_rank: Super Contributor
timestamp: October 19, 2024, 10:55:51 pm
content: Quote from: Furna on October 19, 2024, 10:50:14 pmPlease test and report.

author: KungFuJosh
author_rank: Super Contributor
timestamp: October 19, 2024, 11:23:23 pm
content: Quote from: Furna on October 19, 2024, 10:50:14 pmI think it sounds safer that way. Less likely to damage stuff.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: October 19, 2024, 11:26:30 pm
content: It will ONLY power on all channels at once if you intentionally push the ALL button... I don't see a problem.

author: Furna
author_rank: Frequent Contributor
timestamp: October 20, 2024, 12:14:58 am
content: Quote from: tautech on October 19, 2024, 10:55:51 pmWhat is written in the release notes corresponds to real facts ...- CC mode is now in signaled in red font.- "All On/Off" button behaviour while a channel (or more than one) is already On has changed.Pressing "All On/Off" button while a channel is already On, now power it Off. Counter intuitive IMHO.Quote from: KungFuJosh on October 19, 2024, 11:23:23 pmQuote from: TheDefpom on October 19, 2024, 11:26:30 pmI agree to TheDefpom ... if Siglent want to insert a new layer of "security", please ask me if I really want to power on all channels (press the button twice).Indeed the behaviour has changed substantially.

author: KungFuJosh
author_rank: Super Contributor
timestamp: October 20, 2024, 12:57:58 am
content: Since the behavior only happens while a channel is already powered on, it sounds like somebody broke something and requested the feature.If that was an option you could change in the settings somewhere, that would be cooler.

author: tautech
author_rank: Super Contributor
timestamp: October 20, 2024, 01:26:25 am
content: Quote from: Furna on October 20, 2024, 12:14:58 amThanks.ALL ON/OFF behavior of SPD3303X/X-E has been criticized in that the ALL ON/OFF button would not turn any ON channel to OFF.It seems this change of which I agree with is to provide 2 front panel methods of turninganyactive channel to OFF.In this case it only adds additional functionality to the ALL ON/OFF button.

author: Furna
author_rank: Frequent Contributor
timestamp: October 20, 2024, 11:55:42 am
content: Quote from: tautech on October 20, 2024, 01:26:25 amWith one button only it is a binary situation; as I wrote IMHO a functionality was changed.I flashed back firmware 4.1.2.8 and now I already miss the red font in CC modeRegarding the "revise" history: it is written version 4.1.2.8 is the first release ... when the unit arrived on my bench it was running 4.1.2.6R2 (see photo below)

author: seajayshore
author_rank: Contributor
timestamp: October 20, 2024, 01:17:28 pm
content: I’ll be buying one of these supplies soon…Can anyone who’s had both an SPD4000X and SPD3000X say if fan noise is improved/worse/similar?I know that’s a very use-dependant situation… So just any rough comparison & opinion is all I’m looking for!

author: sparky2024
author_rank: Newbie
timestamp: October 22, 2024, 11:02:31 pm
content: Has anyone else noticed that, with all four channels switched off, when using the master power switch to turn the whole power supply off, channels 2 and 3 will “pulse” the set power level briefly? I do note that relays toggle when master power switch is turned off also.I am seeing this on HW rev 0 SPD4323X, and wonder if this really is an issue (I am afraid of zapping a work in progress breadboard circuit or device I may be diagnosing with “unexpected power”), and whether it could be a firmware fix?

author: mawyatt
author_rank: Super Contributor
timestamp: October 23, 2024, 02:55:02 am
content: Quote from: sparky2024 on October 22, 2024, 11:02:31 pmThat shouldn't happen with any power supply, regardless of pedigree or cost, even a DIY versionOur SPD3303Xs and GPP4323 don't behave this way, if they did we wouldn't have or use them. As you mentioned too much chance for sensitive circuit damageHopefully this misbehavior is only with your individual PS, and not typical behavior for these new SPD4000X models.Best,

author: Furna
author_rank: Frequent Contributor
timestamp: October 23, 2024, 04:46:21 am
content: Quote from: sparky2024 on October 22, 2024, 11:02:31 pmMy unit SDP4121X HW rev 0What firmware version are you running? The firmware version 4.1.2.6R2 that was running when my unit arrived is NOT available on the web site while 4.1.2.8 and 4.1.2.8R1 are availablehttps://www.siglenteu.com/service-and-support/firmware-software/dc-power-supplies/#spd4000x-seriesWhile powering off using the master switch (with NO load connected) I could NOT hear the relays ... will try to better reproduce when back from work.

author: KungFuJosh
author_rank: Super Contributor
timestamp: October 23, 2024, 04:10:42 pm
content: Why not use single trigger on your scopes to test this?

author: Furna
author_rank: Frequent Contributor
timestamp: October 23, 2024, 04:11:52 pm
content: Quote from: KungFuJosh on October 23, 2024, 04:10:42 pmBecause I had no time this morning and I am just back from work

author: sparky2024
author_rank: Newbie
timestamp: October 23, 2024, 05:47:49 pm
content: Scope trace of SPD4323X channel 2 with no load (hence voltage drop is prolonged).Steps to reproduce:1) Set channel 2 to a voltage (5v selected in this case), and switch on channel. Switch off.2) Set scope to Normal or Single trigger, timebase 1sec.3) Switch off main SPD4323X power switch.Note I have no load attached, but have seen LEDs flash on my projects. The amplitude follows the setting. Also this is only evident on ch 2 & 3. Channels 1 & 4 behave as I would expect. Serial or Parallel modes are disabled.Measuring the level (zooming in a bit in this case), we see the level persists for 75ms, and starting from the rising edge is around 100ms total. Sounds like software to me.

author: Furna
author_rank: Frequent Contributor
timestamp: October 23, 2024, 06:00:59 pm
content: Quote from: sparky2024 on October 23, 2024, 05:47:49 pmJust tried also with your settings and cannot reproduce; I have absolutinh nothinh even with trigger set to 30mV.What FW do you run?Indeed I have the following at master power on ... something I do not have at channel power on.I usually disconnect cables to avoid any issue at every master power off/power on.

author: electr_peter
author_rank: Unknown
timestamp: October 23, 2024, 06:01:07 pm
content: @sparky2024, what is the max voltage with mains switching off (if set not to 5V but to max V)? Can you also check maximum possible current with a load (resistor on output)?

author: TheDefpom
author_rank: Frequent Contributor
timestamp: October 23, 2024, 06:09:48 pm
content: T hat looks like capacitor discharge to me, what about leaving the channels off, setting a high voltage, power of the main switch, and then power main switch on?I suspect there would be no pulse in this instance.I’m just waiting for my unit to arrive so I can’t test this myself yet.

author: sparky2024
author_rank: Newbie
timestamp: October 23, 2024, 06:36:07 pm
content: Thank you for swift replies.Peter, I see a peak of around 22v with a voltage setting of 32v. This occurs identically with (img_3337) or without (img_3338) a high wattage 56 ohm resistor as load. Ref. picture.Defpom, I see the same response (as img_3338) without applying the “soft” on button i.e. power-up with prior settings, and just power down with the main switch.There’s a definite capacitor discharge, but the relay in my opinion is charging that capacitor for 75-100ms.

author: sparky2024
author_rank: Newbie
timestamp: October 23, 2024, 06:42:15 pm
content: Furna, my unit is running 4.1.2.8R1. As per another earlier message, my unit arrived with 4.1.2.6. I’ve been living in hope of a firmware fix for this.Wondering if @tautech, or a Siglent rep is following this thread and may be able to comment on this?I may be in touch with my distributor in the UK soon if all else fails.Thanks to all.

author: electr_peter
author_rank: Unknown
timestamp: October 23, 2024, 06:49:55 pm
content: Potential issue with output turning ON with high voltage and high current capability if mains switch is pressed should be looked into more closely (Is it a single unit/early FW/defective component or design specific?).With complicated multi-channel PSUs outputing a "blip" with mains turn-off is not unheard off, but that's not critical when voltage/available current is limited to safe levels by design. If not limited, PSU can kill DUTs.

author: Furna
author_rank: Frequent Contributor
timestamp: October 23, 2024, 07:26:44 pm
content: Quote from: electr_peter on October 23, 2024, 06:49:55 pmI guess TheDefpom and tautech will help when they receive their units ... I understand sparky2024 might chose to return his unit.Quote from: electr_peter on October 23, 2024, 06:49:55 pmI agree; also as I wrote a very simple even if annoying solution is to disconnect cables as an attitude at everty mains power in/off.

author: mawyatt
author_rank: Super Contributor
timestamp: October 23, 2024, 08:06:43 pm
content: Quote from: electr_peter on October 23, 2024, 06:49:55 pmAny overshoot at PS Turn ON/OFF with the Output Enable Buttons and also to the Main Power Switch ON/OFF is of concern to us. A few decades ago we lost a couple of very expensive custom chip sets to a rogue PS that had a glitch at Turn Off, ever sense we have been extremely sensitive to suchBest

author: Furna
author_rank: Frequent Contributor
timestamp: October 23, 2024, 08:14:47 pm
content: Quote from: mawyatt on October 23, 2024, 08:06:43 pmWith SPD4000X series power supply you cannot Turn ON with the Output(s) Enabled; channels are Off even if they were On at previous PS Turn Off.So you may now think the caputure I took, demonstrates even a worst situation than you tough.Disconnect the cables and leave happy

author: mawyatt
author_rank: Super Contributor
timestamp: October 24, 2024, 12:38:51 am
content: Quote from: Furna on October 23, 2024, 08:14:47 pmSo what happens when you have the PS Main Power Switch ON and the Outputs OFF, sensitive circuits connected and a Main AC Power becomes disconnected/interrupedYou shouldn't have a PS that requires removal of the Banana Leads every time to "protect" your sensitive circuits, and then reinstall when you want to power up things again. For us this is totally unacceptable PS behavior and just a recipe for disaster at some pointBest

author: Martin72
author_rank: Super Contributor
timestamp: October 31, 2024, 05:09:17 pm
content: QuoteSensitive circuits usually have overvoltage protection. If not, then you should take action yourself and implement it.

author: blackdog
author_rank: Frequent Contributor
timestamp: November 01, 2024, 11:57:34 am
content: My mantra is that a power supply should always protect its load.And as Martin72 points out, that sensitive circuits should also already have protection themselves.But the world is full of bean counters, so....Then it still comes down to the users, this to know your equipment well and handle it with care.If you have a Spectrum or an expensive VNA, when you make an initial measurement, there is always an attenuator on your input!And if your noise floor is not that important, then leave that attenuator in place.When developing electronics, I still regularly unplug banana sockets.If I am testing something in the early stages of development, there is not always protection in place.The world is not perfect, I certainly am not!With kind regards,Bram

author: mawyatt
author_rank: Super Contributor
timestamp: November 01, 2024, 02:21:11 pm
content: Quote from: Martin72 on October 31, 2024, 05:09:17 pmUnless you can't as in a product development where you are relying on the chip ESD protection in early stages of said development (example using a Lab Supply to bypass the system or on PCB Power Supply and/or Regulators). A chip ESD will protect from the usual body discharge energy but maybe not be robust enough to handle a PS glitch which evidently some of the mentioned PSs can produce!And what about the Mains Power interruption, how is one going to predict this in advance and remove the Banana Leads?? What if the PS is part of an automated test setup, here removing the leads seems impractical, altho one may have a UPS with this setup to protect against Mains Power Interruption, however this adds additional expense and complexity in the setup.Coming from the analog side, and retiring from a career in electronics development, including IC Design, we can tell you that we would never ever allow any type Lab Supply that produces Significant Output Voltage Glitches upon Power Up or Down, whether by Mains Power Switch and/or Output Enable Button.We can assure you that if this is the character of the new Siglent SPD4000X series, they will never end up on our lab bench as a Lab Supply until it's proven to be acceptable which the SPD3303X and GPP-4323 have met and performed well. Even our high current 30A/15A (read not for use with sensitive circuits) Korad KWH102 and 103 which are SMPS types don't misbehave in this regard!!Anyway, as always YMMV.Best

author: mawyatt
author_rank: Super Contributor
timestamp: November 01, 2024, 02:33:12 pm
content: Quote from: blackdog on November 01, 2024, 11:57:34 amAgree a Lab PS should not damage or destroy a load by misbehaving!!Also agree, completed circuits/systems/products should have basic built-in protection. However this usually doesn't apply during early circuit/system/product developments, where one is chasing circuit/system glitches, oscillations, overheating, overcurrent, miswiring, and so on issues. Here, one needs to concentrate on the problems at hand and not Lab Power Supply induced issuesBest,

author: mawyatt
author_rank: Super Contributor
timestamp: November 01, 2024, 02:54:24 pm
content: BTW another potential issue wrt the plugging in and out of the Banana leads involves the Lab Supply Output Capacitance. Many supplies have significant capacitance across the supply output terminals and if these are charged to the set point voltage as when the Output Enable is On, this can introduce a significant current "glitch" into the circuit, well beyond the Current Limit Set Point, when the Banana leads are engaged.Of course one shouldn't plug the leads into a "Live Output", and must remember to make sure the Enable is OFF and no extraneous voltage is present before plugging in the leads, but just another potential source of user error where the result could be disastrousWe make these comments based upon a 60+ year of electronics development and have many "teeth marks" to show, and have learned what works and what doesn't.Learning by error is the most lasting impression, learning from others errors in lasting wisdomBest,

author: jjoonathan
author_rank: Frequent Contributor
timestamp: November 01, 2024, 05:47:38 pm
content: Yep, that's why IMO the first electronics lab class should always start by letting kids explode LEDs on lab power supplies."But I set the current limit to 2mA!""Well, you see..." fun times all around.

author: Furna
author_rank: Frequent Contributor
timestamp: November 05, 2024, 08:05:15 pm
content: Quote from: mawyatt on October 24, 2024, 12:38:51 amQuote from: mawyatt on October 24, 2024, 12:38:51 amAs you said an UPS could and should be used; also someone else wrote about protection circuits.That said this is what I have now and I chose to live with it; if the issue will be addressed I will think about my action.Best

author: mawyatt
author_rank: Super Contributor
timestamp: November 06, 2024, 02:22:54 am
content: Let's all hope Siglent addresses some of these early teething issues, especially the ones that can cause damage rather than just an inconvenience, then we'll consider evaluating one if the need arrisesIt's interesting how our equipment needs seem to follow new introductions, like the superb SDH814X HD. We've explained this to our CEO/CFO/Boss as just a unique coincidenceBest

author: KungFuJosh
author_rank: Super Contributor
timestamp: November 06, 2024, 05:00:49 am
content: Quote from: mawyatt on November 06, 2024, 02:22:54 amDoes that mean "the wife?"

author: tautech
author_rank: Super Contributor
timestamp: November 13, 2024, 08:04:56 am
content: Freshly arrived SPD4306X tests.FW V4.1.2.8R1Measurements taken with DP-35 differential probe @ 20:1 to eliminate any chance of Gnd bounce abnormalities.Probe Check not run to remove any amplitude error.Single shot captures.Output set to OFF and for 2V 30mA on Ch1 (15V 1.5A max)Unloaded output except for Diff probeMains power ONCh1 ON into 50 Ohm 3/4" banana load.

author: mawyatt
author_rank: Super Contributor
timestamp: November 15, 2024, 11:35:14 pm
content: That looks good, so Siglent must have addressed these "Output Voltage Glitch" issues with the new firmware releaseIf so, this demonstrates Siglent is "listening" and responding quickly with important updates that address serious issues such as this, so kudos to SiglentHopefully others will follow up!!Best

author: sparky2024
author_rank: Newbie
timestamp: November 17, 2024, 11:36:23 am
content: Hi @mawyatt, Unfortunately V4.1.2.8R1 did not solve the issue on my SPD4323X. Does anyone else have the SPD4323X, and do they have the same issue with power glitch when mains power is turned off, at channels 2 & 3?Thanks

author: mawyatt
author_rank: Super Contributor
timestamp: November 17, 2024, 03:25:34 pm
content: Quote from: sparky2024 on November 17, 2024, 11:36:23 amMaybe Rob/Scott can do this Power Off test. If this doesn't show up on his new PS with latest firmware, then either you have older/different hardware (PCB) or a defective PS. Either way consider returning this for a replacement, or refund if this is common SPD4323X misbehavior which is totally unacceptable IMO.There was a new thread that this type of PS Output Voltage Glitch misbehavior causing damage to board testing and the OP was looking for PS replacements.https://www.eevblog.com/forum/testgear/quad-output-bench-power-supply/If one thinks about this type PS misbehavior it's somewhat unique! Ingeneral useone can't destroy a circuit with a DSO, AWG or DMM without doing something really stupid (like using a DMM in current mode while sensing the PCB VCC voltage, or turning an AWG On to 20V while connecting to the raw test circuit which isn't powered and has no built-in protection (like signal probing/tracing in R&D development). These, and many more, are user screwups, not instrument induced screwups. We've all been there, done that, it's our own fault, not the test equipmentWith the PS Turn ON/OFF Output Glitch, this is totally different. First off the PS supplies the circuit under test and often in development/test directly bypassing the regulators. All the DUT active circuitry is powered from the PS and susceptible, in many cases uniquely so without any protection, as this powered input may be on the "other side" of any over voltage protection (as in troubleshooting). Here's where an unexpected Power ON/OFF Output Glitch can create havoc with one's attempts at troubleshooting, testing or just general use. Note, this is not due to a user screwup but entirely due to the PS misbehavior and should not be considered acceptable behavior under any condition IMOBest

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 24, 2024, 10:44:31 pm
content: Rob dropped off my new SPD4306X yesterdayI starting trying it out today and recording the review video for it.I did not see any issues with unwanted output on any channel during use of the hard power switch... on or off, sort of.I can confirm the spike it gets when doing the hard power switch is from radiated noise at power on inrush, possibly from switch arcing I don't know for sure, I got the exact same noise both with and without having the scope connected to the power supply terminals, I show that in the footage I recorded for the review.I found a couple of GUI bugs which I have also fed back to Rob, for him to feedback to Siglent, relatively minor quirks, but things I think should be improved, again I will show those in the review video.Fan noise gets moderately high when loading it with 12A for a few minutes, using parallel mode, you will see all this in the review video too.I haven't tried the web interface or remote control yet, I need to get the unit setup in place on my bench first, to replace my Korad KA3305D (which is very slightly larger).I will likely write a device definition for using this supply with Test Controller, I'm not sure when that will be though as my free time is extremely limited.Was also nice to see that the unit has user calibration, just like Siglent did for the SDM3065X due to my feedback and videos, great to see that they realise the importance of that feature now so they included it without being asked this time, looks to be very easy to do too.

author: Hexley
author_rank: Regular Contributor
timestamp: November 24, 2024, 11:36:42 pm
content: Quote from: TheDefpom on November 24, 2024, 10:44:31 pmScott, here is a request for your review video: let us see the reaction of the current readout when a pulsed load is applied at a few Hertz. Does the readout follow the instantaneous current, or does it show an average?The reason for asking is that it would be an interesting point of comparison with the competition. One of the early reviews of the popular Instek GPP-4323, for example, noted "The meter readout is sampled, but there is no filtering. Depending on the current draw waveform you might get a very wrong value (i.e. it can pick the ON or OFF in a PWM load and display that instead of the expected average)."https://www.electrobob.com/gpp-4323-power-supply-review/Whether one wants averaged or non-averaged readout depends on the use case, of course.It would be interesting to know which approach Siglent chose.Thanks.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 24, 2024, 11:51:45 pm
content: Quote from: Hexley on November 24, 2024, 11:36:42 pmI just tested that function (I won't do it in the video, it is already gong to be very long), it does not filter, it only shows the current at the moment it samples, I had it switching between 0A and 2A at various speeds at a 50% duty cycle at 100mS up to 500mS and the display either said 0A or 2A depending upon the current at the moment it sampled.

author: sparky2024
author_rank: Newbie
timestamp: November 25, 2024, 12:26:40 am
content: Scott,Can you please try to replicate the mains switch-off problem that I am seeing?Switch unit on, power-up either channel 2 or 3, say 12v. Soft power off, observe 0v. Then switch off the unit via the mains switch. Do you observe any power glitch from that channel at that time?I’m thinking this may be specific to the SPD4323X or just my unit, since everyone who has responded has one of the other models.Thanks to all for your time, including Tautech who has also very kindly responded on PM.Best regardsSean

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 25, 2024, 01:12:30 am
content: Quote from: sparky2024 on November 25, 2024, 12:26:40 amAs I mention above, no issues with that, I also show it in the footage I shot.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 26, 2024, 09:17:24 pm
content: I found an interesting thing.. all of the actual voltage, current and power responses over SCPI are up to 6 decimal places...See this yourself, send it these and see what you get back!MEAS:VOLT? CH1MEAS:CURR? CH1MEAS:POWER? CH1I am working on the Test Controller definition right now, I have it working already but I'm just tweaking things to tidy it up before I publish it :-)

author: Furna
author_rank: Frequent Contributor
timestamp: November 26, 2024, 09:38:35 pm
content: Quote from: TheDefpom on November 26, 2024, 09:17:24 pmThanks Defpom, I didn't think to start playing with SCPI.Confirmed on SPD4121x too; it is in the User Manual/Programming guide as well at pag. 72Escape character is '^]'.MEAS:VOLT? CH13.003907MEAS:CURR? CH10.019987MEAS:POWER? CH10.060029telnet> closeConnection closed.That is really interesting.Meanwhile I noticed that upgrading the firmware the LAN config was reset; not a big issue for me since I use DHCP but I had to go back in the LAn config and re-enable DHCP.Thank you a lot for your effort on the Test Controller definition and can't wait for the video!

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 27, 2024, 10:56:20 pm
content: Before I can publish the Test Controller definition I need a bit of info about the other units.Can people please confirm the absolute maximum settings for voltage and current on each unit, the data sheet gives general setting only but they can go over that slightly, the quickest way is to select the first digit and spin the encoder clockwise, it will max itself out.For instance my SPD4306X does the followingCh1: 15.15V/1.515ACh2: 30.3V/6.06ACh3: 30.3V/6.06ACh4: 15.15V/1.01A(these are seperate as the data sheet shows these may NOT actually be doubled on some units)Ch2 Series: 60.6V/6.06ACh2 Parallel: 30.3V/12.12APlease list in the same way, once I have this information I can publish then test controller definition.

author: tautech
author_rank: Super Contributor
timestamp: November 27, 2024, 11:16:55 pm
content: See P4https://int.siglent.com/u_file/download/24_08_14/SPD4000X_DataSheet_EN01B.pdf

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 27, 2024, 11:47:21 pm
content: Quote from: tautech on November 27, 2024, 11:16:55 pmI already looked at that and it is not actually correct, which is why I need to hear from others what the 4121 and 4323 maximums are, they do very slightly more than it says, and I want to allow the definitions to use it all.

author: KungFuJosh
author_rank: Super Contributor
timestamp: November 28, 2024, 12:29:29 am
content: Scott's correct; even the SPD3303X datasheet specs are slightly conservative compared to what the device will do/show.

author: tautech
author_rank: Super Contributor
timestamp: November 28, 2024, 07:30:52 am
content: Quote from: TheDefpom on November 27, 2024, 11:47:21 pmWhich could be a wasted exercise if there are minor variations between units.What size sample might you consider sufficient to make assumptions on the max output level across all of the 4 outputs and 3 models.IMO you would be better to use the rated max datasheet output so to be sure all models can meet the programmed output.QuoteQHave you confirmed output higher than rated can be provided using the command set P51 ?https://int.siglent.com/u_file/download/24_08_14/SPD4000X_UserManual_EN01B.pdf

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 28, 2024, 07:49:46 am
content: What I listed is the settings that the unit allow you to go up to, so from my list, Ch1 could be set to do 15.15V and 1.515A, as set on screen, etc.I'm not talking about a measured output voltage on the terminals, but the maximum setting that can be made on screen and via SCPI.

author: Furna
author_rank: Frequent Contributor
timestamp: November 28, 2024, 08:58:02 pm
content: Quote from: TheDefpom on November 27, 2024, 10:56:20 pmSPD4121X: values set using the encoderCh1: 15.15V/1.515ACh2: 12.12V/10.1ACh3: 12.12V/10.1ACh4: 15.15V/1.515ACh2 Series: 24.24V/10.1ACh2 Parallel: 12.12V/20.2A

author: KungFuJosh
author_rank: Super Contributor
timestamp: November 28, 2024, 09:02:27 pm
content: Looks like it's a 1% value increase over any stated number. 15 is 15.15, 10 is 10.1, 12 is 12.12, etc.

author: Furna
author_rank: Frequent Contributor
timestamp: November 28, 2024, 09:25:44 pm
content: Quote from: TheDefpom on November 28, 2024, 07:49:46 am... and I have the same values if I set via SCPI i.e.:SOURce:VOLTage:SET CH1,MAX:SOURce:CURRent:SET CH1,MAXResults inCh1: 15.15V/1.515A

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 28, 2024, 09:32:23 pm
content: Quote from: Furna on November 28, 2024, 08:58:02 pmThats great, and numbers I thought it would be too, have added to the definition.The definition is very nearly done, I have a couple of bugs I am trying to work out where it is not populating a couple of values due to the selector for series/parallel modes, it seems they are not filled in due to being disabled when it loads, I might have to do a dummy value somewhere or something, or ask HKJ about how to get it working, i'm probably missing something obvious.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 28, 2024, 11:55:34 pm
content: Attached is the Test Controller definition, I will probably tweak it more later, possibly to add the list feature etc. but for now this is probably good enough, I will be posting this on the thread by HKJ as well for inclusion in future releases.I noticed in the manual it mentions an X-E and X-C variant... I have ignored those for now as they are not mentioned in the data sheet.

author: tautech
author_rank: Super Contributor
timestamp: November 29, 2024, 12:13:02 am
content: Quote from: TheDefpom on November 28, 2024, 11:55:34 pmOnly applicable to SPD3000 models.In the west we only have SPD3303X and X-E.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 29, 2024, 01:44:33 am
content: Quote from: tautech on November 29, 2024, 12:13:02 amMight want to tell Siglent to fix the user manual then, page 17 list 3 variants for each model.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: December 03, 2024, 08:57:41 am
content: cough...Review Part 1:

author: TheDefpom
author_rank: Frequent Contributor
timestamp: December 05, 2024, 09:31:38 am
content: SDM4306X Review Part 2, the teardownoning.... also look at the web server function along with the Test Controller definition I wrote:

author: Furna
author_rank: Frequent Contributor
timestamp: December 07, 2024, 12:45:09 pm
content: Quote from: TheDefpom on December 03, 2024, 08:57:41 amI have firmware version 4.1.2.8R140':30'' 10.000V bug for CH1 and CH4 is not present in my SPD4121X

author: Furna
author_rank: Frequent Contributor
timestamp: December 07, 2024, 12:56:19 pm
content: Quote from: TheDefpom on December 05, 2024, 09:31:38 amI have firmware version 4.1.2.8R1 on SPD4121X14':30'' On my PSU in the web interface Description and Hostname are correct. Lan Settings are correctly populated and Modify LAN Settings works properly.I have shorter delays when changing Vset and Iset. Also Volt and Current values are shown with shorter delays.Wireshark (network protocol analyzer) demostrates all communication go through TCP80.Also, you didn't realize that "Download" in the List settings, actually uploads the list from the browser to the PSU. Confusing I know but it seems chinese people are confusing the concept quite often.You have to re-"Downalod" the list for each chnage you do i.e. when enabling "continuos" cycling.When Continuos cycling is running, you have to press Play again to stop it.For your issues I would try a different browser (it might solve the "delays" and Lan settings not popualating/working) and re-flashing the firmware (it might solve the Description and Hostname issue.)Definitely the Web Interface need improvements.Thank you for the device definitions in TC!

author: Furna
author_rank: Frequent Contributor
timestamp: December 07, 2024, 01:01:12 pm
content: This Topichttps://www.eevblog.com/forum/testgear/siglent-spd4306x-quality/is temping me to dissamble my PSU to check ...If I get bored during Christmas vacation I will do.It could also be interesting to compare the unpopulated slots with The Defpom's SPD4306X

author: trilerian
author_rank: Regular Contributor
timestamp: February 16, 2025, 08:28:39 pm
content: I have an SPD4121X, software version 4.1.2.8I started doing some scripting with this device and have noticed that after powering down for the night, the DHCP setting is not retained the next day. It goes back to a blank static address. Power down for 20 minutes still retains the DHCP setting. Also, other settings seem unaffected, ie, all the channel settings remain.

author: tautech
author_rank: Super Contributor
timestamp: February 16, 2025, 08:42:32 pm
content: Quote from: trilerian on February 16, 2025, 08:28:39 pmWhen IP is correct set DHCP to OFF.Try the latest FW V4.1.2.8R1https://int.siglent.com/upload_file/zip/firmware/Power_Supply/SPD4000X_4.1.2.8R1_EN.zipMore changes are coming.....we are testing a new beta FW.......

author: trilerian
author_rank: Regular Contributor
timestamp: February 16, 2025, 09:51:34 pm
content: Quote from: tautech on February 16, 2025, 08:42:32 pmI upgraded the firmware, we'll see what happens when I turn it on tomorrow.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: February 16, 2025, 10:02:45 pm
content: What Tautech said, make sure DHCP is turned off if manually setting IP LAN configuration, otherwise the DHCP will replace it on next power up.I have recorded some video on the latest firmware (which is not yet public), I hope to publish it next week to show the improvements that have been made.

author: trilerian
author_rank: Regular Contributor
timestamp: February 16, 2025, 10:05:34 pm
content: Quote from: TheDefpom on February 16, 2025, 10:02:45 pmActually I want DHCP, not static. I reserve the address in my router. The problem is when the machine is off overnight it reverts back to no DHCP on the next power up.

author: tautech
author_rank: Super Contributor
timestamp: February 16, 2025, 10:38:03 pm
content: Quote from: trilerian on February 16, 2025, 10:05:34 pmWhich is a static address.When that address is saved and DHCP is set to OFF your router and instrument should use it by default.Is that not happening ?

author: trilerian
author_rank: Regular Contributor
timestamp: February 16, 2025, 10:55:35 pm
content: Quote from: tautech on February 16, 2025, 10:38:03 pmA reserved DHCP address is not a static address. DHCP negotiation still happens, the DHCP server however has an address reserved for that mac address so when the DHCP request happens the server hands the device the reserved address.What is happening, I set the LAN config on the unit to use DHCP. Great, it pulls an address like it should, DHCP option is on. I can power off the unit for 5 to 10 minutes and the DHCP option is still selected. Great! However, after I power up the unit from being turned off overnight, of after a couple of days, the DHCP option is turned off. I have to go into the settings and select the option again.

author: Furna
author_rank: Frequent Contributor
timestamp: February 17, 2025, 08:31:26 pm
content: Quote from: trilerian on February 16, 2025, 10:55:35 pmI also have an SPD4121X currently running firmware version 4.1.2.8R1.Cannot reproduce, and I have no memories of any issue even with 4.1.2.8.I regurarly cut-off any power to the bench sometimes for days and SPD4121X is systematically get the (reserved MAC address based) IP address and dns server.

author: trilerian
author_rank: Regular Contributor
timestamp: February 17, 2025, 08:57:45 pm
content: No issues on startup today, so that is something.

author: Furna
author_rank: Frequent Contributor
timestamp: February 21, 2025, 05:31:09 pm
content: New short but very interesting video about new beta firmware by TheDefpomhttps://youtu.be/ubGgsEVi17k?si=pkNxByZjeZJ6dX3J

author: sparky2024
author_rank: Newbie
timestamp: April 02, 2025, 02:22:19 pm
content: Brief note to update about my SPD4323X which had the glitch/spike upon mains power off at channels 2 & 3. Contacting the UK supplier (Telonic Instruments) resulted in my unit being repaired by Siglent in Germany. The repair appears successful (a “hardware base board” has been replaced).Thank you to all on here who tried to diagnose this with me, but special thanks and praise must go to the wonderful service and support provided by Telonic Instruments here in the UK who really have been very helpful with this 👏, and Siglent for the repair.Looking forward to the firmware update mentioned by Defpom.

author: sanderb
author_rank: Contributor
timestamp: June 21, 2025, 12:33:09 am
content: I purchased a Siglent SPD4323X a while back but hadn't yet the chance to play with it. I did today, and here are some observations.HARDWARE- Before purchasing it I had noticed the discrepancy regarding its dimensions in the Quick Start Guide and the Datasheet. Turns out the (included) Quick Start Guide is wrong, and the dimensions for all three models of the SPD4000X is the same.- I didn't want to void the warranty, so I only peeked inside through the vents. The internal layout seems to be the same as the SPD4306X of defpom's video, including the second fan on top of the toroid.- It's a shame Siglent didn't add indicator lights directly above the outputs.- I would have preferred the color scheme of the SPD3000X. I understand it's the trend, but the light color scheme is way better for readability.- When turning the voltages up using the knob, the relays for channels 2 & 3 switch at 8/16/24 V. When turning down they switch at 7/14/22 V. No relay switching for channels 1 & 4.- With all channels off, I measure 0V for CH1 & CH4, and -14mV for CH2/CH3.FIRMWARE- The firmware is still at V4.1.2.8R1. It has been 4 months since defpom demonstrated V4.1.2.8R2T1, but V4.1.2.8R2 has still not been released. So all the bugs he reported still exist in the current models.- The UI is not well thought out, is inconsistent and generally makes it feel like an unfinished product. It needs more work.- It should really have a column mode for displaying the 4 channels side-by-side. The layout doesn't match the hardware, which is made worse because of the lack of indicator lights above the channels. At least make it an option, so the marketing material doesn't have to be updated.- In series/parallel mode there is no need to display CH3 at all, especially if we have a column mode. Displaying 3 columns in those modes would also be a perfect indicator that it is not operating in independent mode. I will always use it in series mode.- It would also be nice to have power usage displayed in a small font for each channel.- When a menu button has no function, why display a blank virtual button? On my Siglent SDS1104X-U those placeholders are not displayed in that case, which is how it should be.- The font size for these virtual buttons is inconsistent. Pick one size and adjust the label naming accordingly.- I would like to have a setting so I can enter and display current in mA instead of A.- "List coupling" should be in List settings, and then can be named "Coupling".- Switching from independent operation mode to parallel/series and back to independent overwrites the setting for CH3 with values for CH2. It should restore that.- Save/recall: instead of displaying "Universal fileN" eight times, it would be preferable to display them as a numbered list of 8 rows on the left hand side (just numbers, no name), and on the right hand side of the screen a preview of the selected file setting, like that of the Source view.- Save/recall: Pressing ENTER should recall the selected list.- Save/recall: Does not save or restore the independent/series/parallel operation mode.- Save/recall: after recall, it should switch to the Home view.- In Source Settings view, the voltages on the right always have the "on" colors. They should be gray when the corresponding channel is off, just like in the Home view.- The Menu view is inconsistent with the others. Why not just two-level virtual buttons, instead of having to select the column and then use the arrow keys + ENTER to select an item. With two-level virtual buttons it would require just two key presses (worst case scenario 2 key presses vs current 4 key presses).- Knob function changes depending on the view. It is used to change values, but in the Menu view it is suddenly used for selecting a submenu. On the other hand, in Save/recall it cannot be used for selection. This is inconsistent.- There's no screensaver. There's no power indicator light.- Accessing the web interface using Safari for the current macOS and iPadOS versions (Safari 18) leads to blank information (and errors in the Safari console). It displays better on older macOS versions (e.g. Safari 16), but it also has issues for some views. On Chrome it works well. The web interface needs to be reworked, and an SCPI view added. The web interface has the lowest priority for me (when operating remotely, I will use SCPI).- Setting/getting voltage/current/output state of all 4 channels works with SCPI over USB, albeit a bit slow. Over LAN it works works too, with hostname SPD4323X.local.

author: MildInductor
author_rank: Regular Contributor
timestamp: June 21, 2025, 05:37:34 am
content: My SPD4323X doesn't have a TUV marking which is strange because Defpom's unit does. The layout of the markings on the back of my unit are also different. When looking on the TUV website I can see that the unit is listed as being tested. I wonder why my unit doesn't have the TUV marking?

author: sanderb
author_rank: Contributor
timestamp: June 21, 2025, 02:17:06 pm
content: My SPD4323X has the same back as Defpom's unit, with the same layout and TUV marking. The picture of the back on Siglent's website has a 3rd variant, with the markings at the bottom (without TUV). Odd.

author: MildInductor
author_rank: Regular Contributor
timestamp: June 21, 2025, 09:17:15 pm
content: Weird. I’ll get in contact with them to ask why.

author: sanderb
author_rank: Contributor
timestamp: June 22, 2025, 06:24:00 pm
content: Quote from: sanderb on June 21, 2025, 12:33:09 amA continuation of my post above:HARDWARE- When I place the unit on a table and sit in front of it, I can't see half of the display's header because the bezel is blocking it. I can only see the bottom half of the words "Parallel" and "Series".FIRMWARE- Save/recall: It shouldn't be in the Menu view because there is a dedicated button. The Home/Operation mode/Lock features are also not listed in the Menu view, so why is Save/recall?- Save/recall: "Back" returns to the Menu view even if this function is accessed through its dedicated button. It should return to the previous view.- Save/recall: I set CH2 and CH3 each to 4.5V in independent mode and save it. When I switch to series mode, CH2 changes to the 9V setting, as expected. However, when I recall the saved file while in series mode, CH2 is restored as 4.5V. This is inconsistent.- Output List: Select "Next Page". There is no "Prev Page", only "Back". It returns to the previous page. The virual button should say "Prev Page". "Back" should always return to the previous view, not page. Instead of "Prev Page"/"Next Page", consider using "<" and ">".- Wave: Please add vertical V and A scale settings here. Most of the time I will use the PSU for voltages less than 10V and currents less than 1A.- Defpom noticed the current limiting bug in parallel operation mode. In the firmware update only he received this serious bug was fixed.I will mainly use the device in series operation mode (dual rail). The firmware fix has not been released, so this bug still exist for everyone but Defpom.To demonstrate, I set CH2 and CH3 each to 4.5V and 20mA in independent mode.- I confirm each channel is indeed current limited to 20mA.- I now switch to series mode. As a result, CH2 is correctly set to 9V/20mA on the display.- I turn the channels on. CH2 and CH3 are each correctly at 4.5V.- I short CH2. Its current is limited to 20mA, which is correct.- I short CH3. Its current is limited to 120mA, which is incorrect.- I short CH2+ and CH3-, and the current is limited to 120mA, which is incorrect.- When set it to 1A, the current is limited to 1.1A.- When set it to 100mA, the current is limited to 200mA.- When set it to 1mA, the current is limited to 101mA.So current limiting in series mode is always 100mA too high. This is true for all voltages above 1V. Current limiting in series mode only works correctly for voltages equal to or less than 1V.The current limiting behavior is correct only in independent operation mode.Since I will always use the power supply in series mode, this is a serious bug. It supposedly is fixed in the new firmware, but that firmware never has been released to the public. If anyone from Siglent reads this, please fix the bugs, especially this one, and release the updated firmware.My hardware version is 0-0-0-1, but this is a firmware issue.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 22, 2025, 06:48:55 pm
content: They'll release the firmware when it's ready. They test the stuff thoroughly to avoid other headaches.

author: tautech
author_rank: Super Contributor
timestamp: July 17, 2025, 09:44:40 pm
content: Defpom fixes his SPD4306X after a usage mistake.40+min vid

author: Furna
author_rank: Frequent Contributor
timestamp: July 18, 2025, 08:29:04 pm
content: Quote from: tautech on July 17, 2025, 09:44:40 pmVery useful 40+min vid ...

author: seajayshore
author_rank: Contributor
timestamp: August 08, 2025, 01:11:25 pm
content: Oh no... I have just bricked my SPD4306X trying to upgrade it to FW 4.1.2.8R1...Anyone else done this yet?Got the FW onto a 16GB FAT32 drive which actually showed-up in the menu (32GB USB didn't work)Followed the simple instructions in the upgrade PDF (Press Menu > System ... select the .ADS ... hit Enter etc.)Initially some kind of loading firmware screen & progress bar was progressingWent downstairs to make a cup of tea while waiting... When I came back the screen & buttons are blank... Device has not restarted as it says in the PDFWaited 5mins longer before giving up and powering down... Now it just powers on like the above, blank screen, fan is running & LAN LED is on orange so something is alive...Does anyone have any suggestions to debug or reflash some other way??I have sent an email to Siglent support but thought EEV might help more!

author: 2N3055
author_rank: Super Contributor
timestamp: August 08, 2025, 05:42:00 pm
content: Quote from: seajayshore on August 08, 2025, 01:11:25 pmAbsolutely your first and most important step was to contact support.I personally don't know of any known problems with that PSU in regards to that FW update.It is a bummer it is a weekend, so you will have to wait until Monday before there is a chance someone might answer.

author: seajayshore
author_rank: Contributor
timestamp: August 11, 2025, 03:19:31 pm
content: UPDATE - IT'S FIXEDSo it was incredibly easy to fix and Siglent EU support (Michael Rößle) was fast.I'll paste the solution here as it seems 100% doable for anyone with the same problem in the future:QuoteNote that you really have to keep the rotary knob pressed until the % installation begins to increase. I let go of it early the first time and it failed with a key-press error.Now back to work - no more procrastination excuses now...