Recommending Used power supply with high resolution and accurcy - Page 1
Forum section: electronics / testgear

author: nour
author_rank: Frequent Contributor
timestamp: June 01, 2017, 10:40:08 am
content: I want to buy a used Power supply that has 2 channels output(isolated would be good thing) that can go up to 20-25V\channel and have current capability up to 1~2 ampsThe main feature that I want in this PSU is the step resolution and accuracy for both programming and readback, I want to be able to step with 1mV and 0.1~0.5 mA in the lower range, say between 0 ~ 8V or 10V.Also, it should have a good line regulation and low ripple and noise.I will be using this with sensitive and low power electronics and test LED voltage and currentThanks

author: coromonadalix
author_rank: Super Contributor
timestamp: June 01, 2017, 11:02:02 am
content: Please don't double postkeep one thread.

author: nour
author_rank: Frequent Contributor
timestamp: June 01, 2017, 11:30:23 am
content: Quote from: coromonadalix on June 01, 2017, 11:02:02 amWhat are you talking about

author: tautech
author_rank: Super Contributor
timestamp: June 01, 2017, 12:20:24 pm
content: It's probably outside your budget but have a look at Defpom's review of the Siglent PSU:At least it might help you decide how much functionality you need.

author: nour
author_rank: Frequent Contributor
timestamp: June 01, 2017, 02:38:28 pm
content: Quote from: tautech on June 01, 2017, 12:20:24 pmNo, not even on the list.I prefer Hp/agilent if possible or something else at the same level used

author: nctnico
author_rank: Super Contributor
timestamp: June 01, 2017, 02:47:43 pm
content: Look for an Agilent dynamic or telecom power supply. Something like the 66332A (20V single channel) but there are many more types.

author: gslick
author_rank: Frequent Contributor
timestamp: June 01, 2017, 03:20:38 pm
content: I have a 6632B and 66332A. While those are hard to beat for value when you can pick up a used one in good working condition in the $100 - $200 range (including shipping), those won't meet the desired spec of 1mV and 0.1~0.5 mA programming accuracy. They are specified at 0.05% + 10mV and 0.05% + 2mA. The 6631B with a 8V max has a programming accuracy of 0.05% + 5mV. The 66311B/D and 66309B/D are also specified at a programming accuracy of 0.05% + 10 mV.Maybe more of interest than the programming accuracy is the programming resolution of these supplies.66111A, 66311B/D, 66309B/D output 1Average Programming Resolution: 3.75 mV, 0.75 mA6632B, 66332AAverage Programming Resolution: 5 mV, 1.32 mA6631BAverage Programming Resolution: 2 mV, 2.63 mALooks like these supplies have a 12-bit / 4096 step resolution over their programming voltage ranges.Is there are options which can meet the desired spec at a reasonable price without getting into the SMU product range?

author: nour
author_rank: Frequent Contributor
timestamp: June 01, 2017, 05:08:55 pm
content: Quote from: gslick on June 01, 2017, 03:20:38 pmI want it to be programmable, I mean all digital controls, not an analog front-end.BTW, what is the range of an SMU you are talking about?

author: BravoV
author_rank: Super Contributor
timestamp: June 01, 2017, 05:18:21 pm
content: No money no talk ...What is your MAX budget, other wise all of these chit chat are useless.

author: nctnico
author_rank: Super Contributor
timestamp: June 01, 2017, 05:20:57 pm
content: IMHO you have to be realistic. A 1mV step at 10V is 0.01%. It is very hard (and expensive) to reach that kind of accuracies and you have to make sure you really need this kind of fine grained control. This starts to get into SMU territory so your setup will need sense wires as well.

author: nour
author_rank: Frequent Contributor
timestamp: June 01, 2017, 05:27:50 pm
content: Ok, got it, for used one, around 400~500$ would that be enough, please bare in mind I don't know much about the market so basically if my requirements are too much for the money, well I can lower the level of the requirements say 1mV\1mA for accuracy and resolution for the first 6 or 8 V!Also, I just want a PSU, not an SMU

author: tautech
author_rank: Super Contributor
timestamp: June 01, 2017, 08:22:40 pm
content: Quote from: nour on June 01, 2017, 02:38:28 pmOK, I get preferences...........but.Now we know the specs you need SPD3303X (not X-E) has 1mV,1mA resolution, fully programmable and 3 year warranty.Product and documentation page:http://siglentamerica.com/pdxx.aspx?id=1393&T=2&tid=17

author: nctnico
author_rank: Super Contributor
timestamp: June 01, 2017, 08:45:13 pm
content: Quote from: tautech on June 01, 2017, 08:22:40 pmWhen it comes to stability and accuracy power supplies like the 66311B are in a totally different league compared to regular power supplies. For starters the circuit which drives the output is completely different.

author: vltr
author_rank: Contributor
timestamp: June 02, 2017, 01:36:11 am
content: The Tektronix 2520G & 2521G both come close to meeting your specs but are 10mV resolution:http://www.tek.com/datasheet/ps2520g-ps2521gThere's a few under your $500 on ebay currently.