DMM sized power supply - Page 1
Forum section: electronics / testgear

author: Jeroen3
author_rank: Super Contributor
timestamp: July 05, 2016, 12:35:14 pm
content: A colleague just showed off his new DC power supply.http://www.velleman.eu/products/view/?id=432308For about 150 EUR he had bought a DMM sized digital switchmode "lab" power supply.I'm not sure what to think of it. It looks useful. Especially for those in need of a power supply in the field. (his specialty)But I'm note sure about the maximum common mode (no earth) and the power quality.The brand is not top of the line. But they make/resell some stuff for budget market of reasonable good quality. No issues there.Did anyone do a teardown of this yet?Quote from: oPossum on July 06, 2016, 01:06:43 am

author: VK5RC
author_rank: Unknown
timestamp: July 05, 2016, 12:51:44 pm
content: Interesting format BUT I would spend the money on a good used PSU, I bought a good used HP 6632A for that sort of money. Still going strong (but bit noisy)PS It needs mains supply doesn't it? Any good in the field really?

author: Jeroen3
author_rank: Super Contributor
timestamp: July 05, 2016, 12:57:50 pm
content: You can't really take a HP 6632A with you in your toolbox on a plane.

author: TheAmmoniacal
author_rank: Unknown
timestamp: July 05, 2016, 01:11:06 pm
content: Been looking to get a hold of the small portable "hand type" from Matsusada for quite some time, but this Velleman one looks very nice indeed.

author: Fungus
author_rank: Super Contributor
timestamp: July 05, 2016, 01:17:17 pm
content: Quote from: Jeroen3 on July 05, 2016, 12:35:14 pmLooks cute.

author: TheAmmoniacal
author_rank: Unknown
timestamp: July 05, 2016, 01:29:58 pm
content: Someone please get a hold of this Velleman and do a proper review and characterization. The specifications listed are very lacking.

author: ConKbot
author_rank: Super Contributor
timestamp: July 05, 2016, 09:17:10 pm
content: No ground, so everything is floating at 120V of noise? No thanks, that's not how lab power supplies work.

author: JacobPilsen
author_rank: Regular Contributor
timestamp: July 05, 2016, 09:39:31 pm
content: Field operable supply should be operable at battery.And btw:http://www.ebay.com/itm/321719031574(about 9 $).(and much noise on switching frequency...)

author: Marco
author_rank: Super Contributor
timestamp: July 05, 2016, 11:59:29 pm
content: It doesn't have a grounded plug, where would it get ground from? It's still isolated (would be a death trap if it wasn't).

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: July 06, 2016, 12:49:28 am
content: When I click on that velleman link it always takes me to the locale selection page, once I select a locale it just takes me to the homepage. Any chance you could list the model number so I can see what you are talking about?There was a thread on this tekpower DMM sized power supply a couple of weeks ago. It looked interesting if you need that sort of thing.https://www.eevblog.com/forum/testgear/tekpower-tp3016m-handheld-power-suppy/

author: oPossum
author_rank: Super Contributor
timestamp: July 06, 2016, 01:06:43 am
content: Model LABPSHH01

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: July 06, 2016, 01:25:34 am
content: Thanks. That looks almost identical to the tekpower TP3016M from the thread I linked in my previous post.Edit: Added picture

author: tautech
author_rank: Super Contributor
timestamp: July 06, 2016, 01:29:48 am
content: Quote from: CustomEngineerer on July 06, 2016, 01:25:34 amAlmost?Wonder who is the OEM?

author: D3f1ant
author_rank: Frequent Contributor
timestamp: July 06, 2016, 01:43:06 am
content: Would be more interesting/useful if it had an internal rechargeable battery.

author: Jeroen3
author_rank: Super Contributor
timestamp: July 06, 2016, 05:41:21 am
content: Quote from: CustomEngineerer on July 06, 2016, 01:25:34 amI was waiting for this. They always rebrand stuff.You are correct it does not have ground. It has aC8 socketwithout earth. I was able to perform 250V megger on it, which was >2.5Gohm. Should be fine, until the transients...Yes it is floating. Almost all lab supplies are floating, only some have an additional earth plug on the front.

author: TheAmmoniacal
author_rank: Unknown
timestamp: July 06, 2016, 07:57:26 am
content: The Tekpower OEM is only $99 at Amazonhttps://www.amazon.com/Tekpower-TP3016M-Portable-Handheld-Variable/dp/B015OA1J82

author: Kilrah
author_rank: Unknown
timestamp: July 06, 2016, 08:13:43 am
content: This is very cool, will need to get one (travelling a lot). At the Tekpower price of course though, local distributor sells the Velleman-branded one for 200€

author: Kilrah
author_rank: Unknown
timestamp: July 06, 2016, 08:21:59 am
content: Hmm there's a difference in the specs...Velleman says 0.3-30V 0-3.75A, max 50WTekpower says 0.3-12V 0-3.75A, 0.3-30V 0-1.6AWhile 1.6A@30V is 48W the Tekpower spec could be interpreted as there being a "step" i.e. above 12V there's a current limit to 1.6A rather than a power limit at 50W... Can someone confirm the limit is really on the power on both versions?EDIT: More important it seems it's not universal input, the Tekpower being 110V only and the Velleman 220V only. Wouldn't be surprised they both have respective exclusivity on their region's model, Tekpower being apparently a US brand, not the OEM...EDIT2: One more brand in each zone, so no exclusivity...

author: mcinque
author_rank: Unknown
timestamp: July 06, 2016, 09:16:17 pm
content: Here another "brand".http://www.circuitspecialists.eu/portable-handheld-switch-mode-variable-dc-power-supply-with-lcd-display-0-30v-csi-2002h/

author: analog_user
author_rank: Newbie
timestamp: January 03, 2017, 02:00:36 pm
content: Hi,I have the "CSI 2002H" model. I bought it to use it as power supply for small projects which don't require precise voltage/current control (flashing leds for bicycle dynamos, led panels, ...) and it does its job.I like the fact that you can limit the current before enabling the output. It sounds silly, but I saw cheap bench power supplies which don't display it before enabling the output.The problem that I found is that if you enable the usb port while using the general output, the voltage switches to 5 volts, it enables the usb supply, but doesn't disable the the general output, so you can fry whatever is connected in case it doesn't tolerate 5 volts. So, it is fine if you care about not to enable the usb port while using the general output.

author: corecode
author_rank: Newbie
timestamp: April 12, 2017, 12:10:00 pm
content: Seem the OEM ishttp://www.nbjiuyuan.cn/as evidenced by this manualhttps://www.circuitspecialists.com/content/185726/csips2002h.pdf

author: kazik70
author_rank: Contributor
timestamp: January 26, 2018, 12:30:11 pm
content: Another brandhttps://www.tme.eu/gb/details/ax-3004h/one-channel-power-supplies/axiomet/there are 360angle view

author: Fungus
author_rank: Super Contributor
timestamp: January 26, 2018, 12:51:30 pm
content: Quote from: TheAmmoniacal on July 05, 2016, 01:11:06 pmWhere would you even buy one?

author: TheAmmoniacal
author_rank: Unknown
timestamp: January 26, 2018, 05:59:58 pm
content: Quote from: Fungus on January 26, 2018, 12:51:30 pmI did end up buying one actually, but not the smallest "hand type" model. I got one which is about twice as deep (long). It seems to have a problem though, unfortunately. I measure 2 V p-p ripple on CV mode, far less (150 mV p-p iirc?) on CC mode. Just have keep an eye out on ebay.