Here's An Interesting New Brand Label....

[whipman]

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

[Wuerstchenhund]

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

I 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 

[elliott]

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.

[T3sl4co1l]

"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

[gxti]

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.)

If 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.

[pickle9000]

When you count in the shipping you are close to the Korad, Hantek programmables.

[elliott]

When you count in the shipping you are close to the Korad, Hantek programmables.

It 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.

[kwass]

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

[Wuerstchenhund]

This "china export" theory is a total crock and I wish people would stop repeating it.

Indeed, 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

[Bud]

..Rigol is now a serious contender in the T&M market

Nice joke
 

[chickenHeadKnob]

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.

Have to agree, normal people want number pad entry AND rotary 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

[tautech]

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.

Have to agree, normal people want number pad entry AND rotary 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

Not 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/917544
Contact owner David, he will tell you if it's OK and IME most of what he has is.

I occasionally source from him.

[Wuerstchenhund]

..Rigol is now a serious contender in the T&M market

Nice joke
 

Hey, 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.

[timb]

Why are there buttons that go to directly to 4.2V and 19V?


Sent from my Smartphone

[amyk]

The voltage of a fully-charge lion battery, and that which a typical laptop will accept.

[timb]

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

[electr_peter]

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.)

There 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).

[Maxlor]

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.

[amyk]

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

[Warhawk]

Do the Chinese use anything else than serif font for everything they see ? The front panel is awful