Here's An Interesting New Brand Label.... - Page 1
Forum section: electronics / testgear

author: whipman
author_rank: Contributor
timestamp: December 25, 2014, 04:54:58 pm
content: Hope I'm not violating any forum rules, but here goes:http://www.ebay.com/itm/Dual-Channels-Programmable-DC-Power-Supply-0-30V-0-5A-5V-2A-USB-Output-DPS305A-/271717755803?pt=LH_DefaultDomain_0&hash=item3f43a3eb9b

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: December 25, 2014, 05:20:48 pm
content: Quote from: whipman on December 25, 2014, 04:54:58 pmI guess the proof that Rigol is now a serious contender in the T&M market is when some Chinese sweat shops start to imitate the name

author: elliott
author_rank: Regular Contributor
timestamp: December 25, 2014, 06:40:21 pm
content: That might be the worst control setup of any power supply ever made. I also like how the rear view is showing a missing screw on the power input.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 25, 2014, 06:57:08 pm
content: "CE", yeah, sure!It's not even the "China Export" CE mark, so they can't even get that right.(Supposedly, the difference is, the C-E separation distance is very close in the China Export symbol, and the radius of the C in the proper CE mark; although a lot of legitimate users fudge the spacing anyway.)Tim

author: gxti
author_rank: Frequent Contributor
timestamp: December 25, 2014, 08:16:31 pm
content: Quote from: T3sl4co1l on December 25, 2014, 06:57:08 pmIf someone tried to weasel out of a lawsuit due to such a trivial technicality, claiming that it's not really a CE mark because of the spacing, they'd be laughed out of the courtroom. This "china export" theory is a total crock and I wish people would stop repeating it. It's nothing more than a sloppy oversight by companies that just don't care. The mark on this particular product is even worse than most I've seen.

author: pickle9000
author_rank: Super Contributor
timestamp: December 25, 2014, 08:25:58 pm
content: When you count in the shipping you are close to the Korad, Hantek programmables.

author: elliott
author_rank: Regular Contributor
timestamp: December 25, 2014, 09:14:27 pm
content: Quote from: pickle9000 on December 25, 2014, 08:25:58 pmIt is more expensive than an equivalent Korad. This one isn't even able to be remotely controlled, so it would be competing with the KA3005D instead of the P.

author: kwass
author_rank: Frequent Contributor
timestamp: December 25, 2014, 10:40:41 pm
content: It looks like this goes under another brand name too, Hongsheng. There are several different versions, apparently. The DSP0395BF/CF claims 100ua current read-back precession.http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dtools&field-keywords=DPS-305

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: December 25, 2014, 11:51:06 pm
content: Quote from: gxti on December 25, 2014, 08:16:31 pmIndeed, there's no "China Export" label, and people should stop spreading that nonsense. For the doubters, no need to take my word for it:http://www.europarl.europa.eu/sides/getAllAnswers.do?reference=P-2007-5938&language=EN

author: Bud
author_rank: Super Contributor
timestamp: December 26, 2014, 04:10:26 am
content: Quote from: Wuerstchenhund on December 25, 2014, 05:20:48 pmNice joke

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: December 26, 2014, 04:35:15 am
content: Quote from: elliott on December 25, 2014, 06:40:21 pmHave to agree, normal people want number pad entryANDrotary controls. The description doesn't say whether it is linear or switching or for that matter isolated. It does say it is quiet and fanless, which suggests a switcher. Also they state; 220V ONLY Ask for 120V by special arangment

author: tautech
author_rank: Super Contributor
timestamp: December 26, 2014, 04:52:05 am
content: Quote from: chickenHeadKnob on December 26, 2014, 04:35:15 amNot sure it is a SMPS, the ripple spec is too good, but the light weight suggests it might be.Check it out also at:http://www.aliexpress.com/store/917544Contact owner David, he will tell you if it's OK and IME most of what he has is.I occasionally source from him.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: December 26, 2014, 10:38:18 am
content: Quote from: Bud on December 26, 2014, 04:10:26 amHey, I'm not saying that all their stuff is great (I know it isn't) or that it's as good as the big brands, but I think it's pretty safe to say that Rigol has become a name in low end T&M stuff.

author: timb
author_rank: Super Contributor
timestamp: December 26, 2014, 11:10:59 am
content: Why are there buttons that go to directly to 4.2V and 19V?Sent from my Smartphone

author: amyk
author_rank: Super Contributor
timestamp: December 26, 2014, 01:06:03 pm
content: The voltage of a fully-charge lion battery, and that which a typical laptop will accept.

author: timb
author_rank: Super Contributor
timestamp: December 27, 2014, 12:27:20 am
content: But the nominal LiOn voltage is 3.7v and there is no "typical" laptop. (Anywhere from 15 to 24V is common, though I guess 19V is the median there.)Either way, nowhere near useful enough to have hard coded buttons. I'd say 3.3V and 5V would be more useful if anything.Sent from my Smartphone

author: electr_peter
author_rank: Unknown
timestamp: December 27, 2014, 12:38:51 am
content: Quote from: timb on December 27, 2014, 12:27:20 amThere is no typical battery, but typical LiIon/LiPo has nominal voltage of 3.6V or 3.7V and is charged to 4.1V or 4.2V. So 4.2V button could be useful in theory. However, you still need to adjust the current for your battery (be it small or large capacity) via buttons, so what is the point then?In my opinion these dedicated buttons are a "wank" feature (that is not really useful, marketing feature).

author: Maxlor
author_rank: Frequent Contributor
timestamp: December 27, 2014, 01:29:29 am
content: Apparently, phone and laptop repair is a big thing in china. I see it as one of the main advertized points with many power supplies on aliexpress, suitable for repair shops.And yes, 4.2V is what you need when you want to charge a standard phone LiPo cell. Some current limit would be nice too, but if you're not too worried about battery longevity, you can get by without it.All laptops I've used in the past couple of years did indeed have 19V supplies I think.It seems to me that the makers of power supplies such as this one expect to sell a lot more of them to small business than to hobbyists playing with 3.3V or 5V. Seems plausible too from what I've seen in Hong Kong; I don't think too many people there have the time, space or money to pick up electronics as a hobby.

author: amyk
author_rank: Super Contributor
timestamp: December 27, 2014, 02:51:02 am
content: The 4.2V output is intended for the same purpose as the 19V: to power a phone being serviced, not for battery charging.As for laptops, almost all of them accept input voltages in one of two ranges: ~9 to 12V (16V-rated cap on main rail) and ~14V up to 24V (25V caps). The lower range is usually netbooks with a 2S battery, so the majority of them are in the 2nd range. More info on that here:https://www.eevblog.com/forum/repair/replacing-apple-magsafe-85w-charger-with-a-normal-laptop-psu-possible/msg483953/#msg483953

author: Warhawk
author_rank: Frequent Contributor
timestamp: December 27, 2014, 10:28:51 am
content: Do the Chinese use anything else than serif font for everything they see ? The front panel is awful