Good lab power supply, not china crap yet not overpriced?  - Page 1
Forum section: electronics / testgear

author: smile
author_rank: Regular Contributor
timestamp: December 27, 2016, 05:07:19 am
content: Hello, is there such thing as Good lab power supply, not china crap yet not overpriced?I see the gwinstek has one PSP-405:Voltage 0~40VCurrent 0~5APROTECTIONOVL/OCL/OPL/OTPhttp://www.gwinstek.com/en-global/pr...ies/PSP-SeriesThey unfortunally do not make up to 10A version with voltage at 40VThat's their cheapest power supply at 285.55 €http://www.tme.eu/en/details/psp-405...ies/gw-instek/Is the something better priced with same parameters, available in EU, and with same OVL/OCL/OPL/OTP protections?

author: tautech
author_rank: Super Contributor
timestamp: December 27, 2016, 05:36:00 am
content: Siglent have been selling a few of their SPD3303X-E 3 channel units lately:@ 370 Euro I know that's a bit more than you wanted to know.http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17

author: plesa
author_rank: Frequent Contributor
timestamp: December 27, 2016, 08:13:30 am
content: Check ebay for used PSU.I will not buy any PSU from Rigol,GW Instek of Siglent. Maybe HW is OK, but their SW and firmware is not comparable with Agilent/HP stuff.

author: smile
author_rank: Regular Contributor
timestamp: December 27, 2016, 11:13:39 am
content: Quote from: tautech on December 27, 2016, 05:36:00 amVery nice find.Can I use channels like 32V 3.2A×2 means total of 6.4A, so I get single channel of 32V at 6.4A?

author: rf-loop
author_rank: Super Contributor
timestamp: December 27, 2016, 11:48:13 am
content: Quote from: smile on December 27, 2016, 11:13:39 amYes.Mode: Parallel (it use Ch1 and Ch2 internally connected parallel)Parallel mode output is CH1 out (just like single channel power supply. Do not use CH2 outputs at all in this mode) In this mode 0 - 32V and 0 - 6.4A.http://www.siglentamerica.com/USA_website_2014/Documents/QuickStart/SPD3303X_QuickStart_QS0503X-E01A.pdfPage 15.

author: smile
author_rank: Regular Contributor
timestamp: December 27, 2016, 12:04:10 pm
content: Is the SPD3303X-E linear also like the SPD3303X?I wonder if it is possible to hack to for higher resolution?

author: nctnico
author_rank: Super Contributor
timestamp: December 27, 2016, 12:19:15 pm
content: Quote from: plesa on December 27, 2016, 08:13:30 amIt is all made in Asia. The problem with HP/Agilent power supplies is that the fans are very loud (even on the models which change the fan speed depending on the load).IMHO the GW Instek GPE-2323 seems like a reasonable choice to me. 1mA current read back resolution, individual knobs for voltage/current for each channel and relatively low price.

author: smile
author_rank: Regular Contributor
timestamp: December 27, 2016, 12:30:12 pm
content: Well I have some stuff from China that is high quality. It all depends on price you pay. And also on the honesty of the manufacturer / seller. One can overprice stuff like crazy, that does not make things better.

author: Seekonk
author_rank: Super Contributor
timestamp: December 27, 2016, 01:32:52 pm
content: I have power supplies coming out of my ying yang, Lambda, HP, Fluke/Philips and Xantrex. These are really nice supplies. Getting a deal on one is something I can't resist. Don't think I've paid much more than $70 for any of them. Sure, they didn't quite work, but your hobby is electronics. If you make a concerted effort and are patient they can be found.

author: tautech
author_rank: Super Contributor
timestamp: December 27, 2016, 07:37:34 pm
content: Quote from: smile on December 27, 2016, 12:04:10 pmYes, how else would they weigh 8kg.QuoteQuite possibly but you'd have to find some internal imagery to check the PCB's are exactly the same. E, meaning the economy model may have some HW changes to bring the price down the 140 Euro from the higher res X model.While I understand the satisfaction of enabling further functionality by hacking you'd have to wonder if the time you spent trying it might not be better to just shell out the extra and get on with using it ?Other features:Smart fan cooled. (very very quiet in idle mode)Series or parallel outputsEtc.Datasheet:http://www.siglentamerica.com/USA_website_2014/Documents/DataSheet/SPD3303X_DataSheet_DS0503X-E01A.pdf

author: nctnico
author_rank: Super Contributor
timestamp: December 27, 2016, 08:12:20 pm
content: IIRC the price difference is 370 euro versus 610 euro so a hack is 'worth' 240 euro. Given the price difference I expect the hardware to be (somewhat) different but it is a lot of money to go from 10mA to 1mA resolution. At 610 euro I'd rather look at Agilent's E36100 series with a much higher precision/resolution current and voltage read back.

author: tautech
author_rank: Super Contributor
timestamp: December 27, 2016, 08:23:42 pm
content: 509 Eurohttp://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17

author: JPortici
author_rank: Super Contributor
timestamp: December 27, 2016, 08:29:38 pm
content: true dat! you were comparing X after tax with X-E before tax

author: nctnico
author_rank: Super Contributor
timestamp: December 27, 2016, 09:09:25 pm
content: Quote from: tautech on December 27, 2016, 08:23:42 pmI rembered the price including VAT from Eleshop.nl but didn't notice you quoted the price ex. VAT. The difference including VAT is 170 euro for 10mA (440 euro) versus 1mA resolution (610 euro) even though the accuracy is the same for both models (0.3% +10mA). Since VAT is quite constant across Europe (21% to 25%) it doesn't hurt to just quote the prices including VAT.

author: smile
author_rank: Regular Contributor
timestamp: December 29, 2016, 12:22:14 pm
content: After all I ordered Rigol DP832, now where is that website to generate the hack codes ?

author: rf-loop
author_rank: Super Contributor
timestamp: December 29, 2016, 01:13:43 pm
content: Quote from: nctnico on December 27, 2016, 09:09:25 pmIs it better write: "even though my belief is that the accuracy is the same for both models"Quote from: Siglent data sheetI can detect some differences, or is it optical illusion what I can see.

author: JPortici
author_rank: Super Contributor
timestamp: December 29, 2016, 01:19:49 pm
content: tell siglent the chart on the web page is wrong then (at the bottom of the pageyouEDIT:tautech linked)

author: rf-loop
author_rank: Super Contributor
timestamp: December 29, 2016, 01:49:58 pm
content: Quote from: JPortici on December 29, 2016, 01:19:49 pmI have not linked any page.It need note to Siglent that European web side have error.But here is what I see Siglent America web side what I usually use.But this attached image is not what I read.I read official data sheets and quote was from latest data sheet (version 2015.7).

author: nctnico
author_rank: Super Contributor
timestamp: December 29, 2016, 09:30:29 pm
content: Quote from: smile on December 29, 2016, 12:22:14 pmI have a feeling lots of GW Instek lab power supplies are dumped on Ebay right now (probably from the ITT university bankcrupty sale).

author: nctnico
author_rank: Super Contributor
timestamp: December 29, 2016, 09:45:20 pm
content: Quote from: rf-loop on December 29, 2016, 01:13:43 pmWhen the X model shows 100mA the actual current can be 90mA to 110mA. When the X-E model shows 100mA then the actual current can be 80mA to 120mA. All in all the extra resolution of the X model doesn't really translate into being able to see small currents in the single mA range.

author: wraper
author_rank: Unknown
timestamp: December 29, 2016, 10:34:58 pm
content: Quote from: nctnico on December 27, 2016, 12:19:15 pmDepends on model, some are not loud at all, or are fanless. Agilent 6612C were so unbearably loud that I modified resistor values in the fan speed control circuit.

author: pascal_sweden
author_rank: Super Contributor
timestamp: December 29, 2016, 11:54:19 pm
content: Quote from: nctnico on December 29, 2016, 09:30:29 pmCan you elaborate more on this bankruptcy sale? Which company or university? And in which country?Any link to the bankruptcy event or to the actual sale on Ebay?

author: nctnico
author_rank: Super Contributor
timestamp: December 30, 2016, 12:06:25 am
content: Just look in the 'buy, sell wanted' section and you'll see.

author: lordvader88
author_rank: Frequent Contributor
timestamp: December 30, 2016, 04:19:02 am
content: Yup OP, I need the same thing, I've been using SMPS from DVD players, an older printer, and random wall packs. Thats fine enough for most little things I do, but so it won't be.

author: JonM
author_rank: Unknown
timestamp: December 30, 2016, 05:26:28 am
content: An interesting PS is "coming soon" at CrowdSupply:https://www.crowdsupply.com/envox/eez-h24005

author: HighVoltage
author_rank: Super Contributor
timestamp: December 30, 2016, 09:12:07 am
content: Look on ebay for well established brand names and if you have a little time, you will get a really good lab PSU for a low price.I have bought plenty of Agilent lab gear on ebay for significantly reduced prices.

author: bingo600
author_rank: Super Contributor
timestamp: December 30, 2016, 12:05:01 pm
content: I have one of thesehttp://www.ebay.com/itm/HP-Agilent-6038A-System-DC-Power-Supply-0-60V-0-10A-200W-Tested-GOOD-/132048373898It's a switcher , but a quiet one , with 60V/10A (240W) - It might fit your 40V@10A.For precision i use HP/Agilent 6632B linear , but it's quite noisy.I'd also recommend the TTI's , these are excellent , and can be gotten quite cheap.http://www.ebay.com/itm/TTi-EX3540-Power-Supply-280W-Operating-Range-198V-264VAC-/291593982208I have 2 of these (fanless), and they perform as my HP E3610A (watch out with E3610A - A 110v unit can't be converted to 220v)http://www.ebay.com/itm/TTI-THURLBY-THANDAR-INSTRUMENTS-PL154-15-4A-DC-Power-Supply-PSU-WORKING-/122290379172This is more expensive , but same sellerhttp://www.ebay.com/itm/TTI-THURLBY-THANDAR-INSTRUMENTS-PL154-15-4A-DC-Power-Supply-PSU-WORKING-/132046912006This is a nice lab supply (for +/-)http://www.ebay.com/itm/TTi-THURLBY-THANDAR-INSTRUMENTS-PL330QMD-/172031348930Note: Wrt. TTi ... PL prefix = Precision Line/BingoPs: Show your location , this was an exception that i ansvered an unlocated person.

author: 2N3055
author_rank: Super Contributor
timestamp: December 30, 2016, 03:13:54 pm
content: Quote from: smile on December 29, 2016, 12:22:14 pmOK, nobody reads... He bought RIGOL in meantime.....OP should mark topic SOLVED...