EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: smile on December 27, 2016, 05:07:19 am
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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 0~40V
Current 0~5A
PROTECTION
OVL/OCL/OPL/OTP
http://www.gwinstek.com/en-global/pr...ies/PSP-Series (http://www.gwinstek.com/en-global/pr...ies/PSP-Series)
They unfortunally do not make up to 10A version with voltage at 40V
That's their cheapest power supply at 285.55 €
http://www.tme.eu/en/details/psp-405...ies/gw-instek/ (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?
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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 (http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17)
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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.
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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 (http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17)
Very 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?
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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 (http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17)
Can I use channels like 32V 3.2A×2 means total of 6.4A, so I get single channel of 32V at 6.4A?
Yes.
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.pdf (http://www.siglentamerica.com/USA_website_2014/Documents/QuickStart/SPD3303X_QuickStart_QS0503X-E01A.pdf)
Page 15.
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Is the SPD3303X-E linear also like the SPD3303X?
I wonder if it is possible to hack to for higher resolution?
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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.
It 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.
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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.
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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.
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Is the SPD3303X-E linear also like the SPD3303X?
Yes, how else would they weigh 8kg. ;)
I wonder if it is possible to hack to for higher resolution?
Quite 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 outputs
Etc.
Datasheet:
http://www.siglentamerica.com/USA_website_2014/Documents/DataSheet/SPD3303X_DataSheet_DS0503X-E01A.pdf (http://www.siglentamerica.com/USA_website_2014/Documents/DataSheet/SPD3303X_DataSheet_DS0503X-E01A.pdf)
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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.
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509 Euro
http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17 (http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17)
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true dat! you were comparing X after tax with X-E before tax
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509 Euro
http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17 (http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17)
I 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.
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After all I ordered Rigol DP832, now where is that website to generate the hack codes ?
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... even though the accuracy is the same for both models (0.3% +10mA).
Is it better write: "even though my belief is that the accuracy is the same for both models"
X-E
4 digits voltage 3 digits current
Resolution
10mV/10mA
Program Accuracy
Voltage ± (0.5% of reading+2digits)
Current ± (0.5% of reading+2digits)
Readback Accuracy
Voltage ± (0.5% of reading+2digits)
Current ± (0.5% of reading+2digits)
X
5 digits voltage 4 digits current
Resolution
1mV/1mA
Program Accuracy
Voltage ± ( 0.03% of reading+10mV )
Current ± ( 0. 3% of reading+10mA )
Readback Accuracy
Voltage ± ( 0.03% of reading+10mV )
Current ± ( 0. 3% of reading+10mA )
I can detect some differences, or is it optical illusion what I can see.
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tell siglent the chart on the web page is wrong then (at the bottom of the page
you EDIT:tautech linked)
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tell siglent the chart on the web page is wrong then (at the bottom of the page you linked)
I 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).
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After all I ordered Rigol DP832, now where is that website to generate the hack codes ?
I have a feeling lots of GW Instek lab power supplies are dumped on Ebay right now (probably from the ITT university bankcrupty sale).
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... even though the accuracy is the same for both models (0.3% +10mA).
Is it better write: "even though my belief is that the accuracy is the same for both models"
X-E
4 digits voltage 3 digits current
Resolution
10mV/10mA
Program Accuracy
Voltage ± (0.5% of reading+2digits)
Current ± (0.5% of reading+2digits)
Readback Accuracy
Voltage ± (0.5% of reading+2digits)
Current ± (0.5% of reading+2digits)
X
5 digits voltage 4 digits current
Resolution
1mV/1mA
Program Accuracy
Voltage ± ( 0.03% of reading+10mV )
Current ± ( 0. 3% of reading+10mA )
Readback Accuracy
Voltage ± ( 0.03% of reading+10mV )
Current ± ( 0. 3% of reading+10mA )
I can detect some differences, or is it optical illusion what I can see.
When 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.
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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.
It 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).
Depends 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.
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I have a feeling lots of GW Instek lab power supplies are dumped on Ebay right now (probably from the ITT university bankcrupty sale).
Can 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? :)
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Just look in the 'buy, sell wanted' section and you'll see.
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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.
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An interesting PS is "coming soon" at CrowdSupply:
https://www.crowdsupply.com/envox/eez-h24005 (https://www.crowdsupply.com/envox/eez-h24005)
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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.
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I have one of these
http://www.ebay.com/itm/HP-Agilent-6038A-System-DC-Power-Supply-0-60V-0-10A-200W-Tested-GOOD-/132048373898 (http://www.ebay.com/itm/HP-Agilent-6038A-System-DC-Power-Supply-0-60V-0-10A-200W-Tested-GOOD-/132048373898)
It'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-/291593982208 (http://www.ebay.com/itm/TTi-EX3540-Power-Supply-280W-Operating-Range-198V-264VAC-/291593982208)
I 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-/122290379172 (http://www.ebay.com/itm/TTI-THURLBY-THANDAR-INSTRUMENTS-PL154-15-4A-DC-Power-Supply-PSU-WORKING-/122290379172)
This is more expensive , but same seller
http://www.ebay.com/itm/TTI-THURLBY-THANDAR-INSTRUMENTS-PL154-15-4A-DC-Power-Supply-PSU-WORKING-/132046912006 (http://www.ebay.com/itm/TTI-THURLBY-THANDAR-INSTRUMENTS-PL154-15-4A-DC-Power-Supply-PSU-WORKING-/132046912006)
This is a nice lab supply (for +/-)
http://www.ebay.com/itm/TTi-THURLBY-THANDAR-INSTRUMENTS-PL330QMD-/172031348930 (http://www.ebay.com/itm/TTi-THURLBY-THANDAR-INSTRUMENTS-PL330QMD-/172031348930)
Note: Wrt. TTi ... PL prefix = Precision Line
/Bingo
Ps: Show your location , this was an exception that i ansvered an unlocated person.
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After all I ordered Rigol DP832, now where is that website to generate the hack codes ?
OK, nobody reads... He bought RIGOL in meantime.....
OP should mark topic SOLVED...