Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
jaouadnet
User Rank
Rookie
Test USB 3.0 Compliance
jaouadnet   7/21/2013 7:58:45 AM
NO RATINGS
Yes this is true

Test engineers who have developed automated test systems with USB-based instruments probably won't upgrade for a very long time. Why introduce a new variable that might bring a system down. There could be timing problems, as Eric Bogatin wrote in العاب كرتون نتورك

 

Tom Murphy
User Rank
Blogger
Re: Pre-compliance testing
Tom Murphy   7/19/2013 2:16:33 PM
NO RATINGS
MB:  Renew Computers is a business near my home in Northern Calif that refurbishes older computers that people brought in for recycling.  A 2-3 year old laptop or desktop comes with software and a warranty for about $200-250, depending on what you're looking for.  They're doing a nice business -- friendly folks with a service department you just gotta love.

Terry Moore
User Rank
Rookie
Re: Pre-compliance testing
Terry Moore   7/19/2013 2:13:00 PM
NO RATINGS
Our test customers (and our software customers) often have difficultly putting together and maintaining a USB Gold Tree for interop testing. The specified equipment can be hard to find, and you almost have to be a certified test lab to be sure that what you have matches the current USB-IF reference. 

This is tough enough, in fact, that MCCI is thinking about offering a USB Gold Tree support service. If anybody's interested in being a guinea pig for these, please contact us via our website: http://www.mcci.com/mcci-v5/services/compliance_testing.html

 

The gold tree is relatively inexpensive, and it's reasonable for anybody serious about USB testing to have one inhouse.  The test equipment for USB 3 pre-compliance testing (or even for USB 2 pre-compliance testing) is quite expensive. Smaller groups will find that it's hard to justify purchasing the gear. But it's still important to test! One alternative is to engage a USB certified test lab -- most labs offer some kind of pre-screening or pre-compliance test service. Even if USB logo certification is not an important marketing requirement, these tests are important.

Coming back to your question, Janine about "horror stories on compliance testing" -- I think the bigger horror stories relate to our customers who didn't do compliance testing as part of their product development cycle, and then found that their products had unacceptable failure rates in the field.

MeasurementBlues
User Rank
Blogger
Re: Pre-compliance testing
MeasurementBlues   7/19/2013 1:39:00 PM
NO RATINGS
I buy old Dell D600 laptops froim eBay. First one (now spare parts) cost $330. Latest one cost under $100 with a 3x larger hard drive. I have two others, though one is showing signs of mechanical problems.

For watching streaming video, an iPad2 does a better job.

Tom Murphy
User Rank
Blogger
Re: Pre-compliance testing
Tom Murphy   7/19/2013 1:21:03 PM
NO RATINGS
I'm with you, Measurement Blues.  I have a couple over very stable XP machines that won't die. Whenever I get tempted to buy a new computer, I find I'd rather spend the cash on fixing the roof or taking a weekend trip. It's not just engineers, I think....there are millions of consumers who used to snap up every new gizmo and are now giving second thoughts to making such major purchases.  And then there is the generational thing: I know scores of people under 30, but very few of them would consider buying a laptop today (never mind a desktop machine).  I'm not sure what impact those changes will have on the adoption of USB 3.0, but it seems like it is bound to slow it down.  Thoughts?

MeasurementBlues
User Rank
Blogger
Re: Pre-compliance testing
MeasurementBlues   7/19/2013 12:59:05 PM
NO RATINGS
Test engineers who have developed automated test systems with USB-based instruments probably won't upgrade for a very long time. Why introduce a new variable that might bring a system down. There could be timing problems, as Eric Bogatin wrote in USB: Not Always Universal.

MeasurementBlues
User Rank
Blogger
Re: Pre-compliance testing
MeasurementBlues   7/19/2013 12:56:23 PM
NO RATINGS
>Does anyone know when this is expected to be commonplace in devices?

It will take several years as people upgrade their computers. Some might add USB 3.0 through an adapter for a desktop computer. The rest of us will porbably get USB 3 with or next computer. Me? I'm still running XP computers and will until they die. Engineers aren't usually the early adapters. Instead, we find way to keep our old equipment running.

I recently bought an external Hard drive that's USB 3.0 equipped. I run it at USB 2.0 speeds.

Tom Murphy
User Rank
Blogger
Re: Pre-compliance testing
Tom Murphy   7/18/2013 6:27:26 PM
NO RATINGS
I'm looking forward to a ten-fold increase, but I wonder about the timetable.  Does anyone know when this is expected to be commonplace in devices?

JanineLove
User Rank
Blogger
Pre-compliance testing
JanineLove   7/18/2013 1:21:08 PM
NO RATINGS
Anyone have any horror stories on compliance testing? Something you really wish you had known beforehand....??



Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
<b><a href=Betajet">

The Circle – The Future's Imperfect in the Present Tense
Betajet
5 comments
The Circle, a satirical, dystopian novel published in 2013 by San Francisco-based writer Dave Eggers, is about a large, very powerful technology company that combines aspects of Google, ...

Max Maxfield

Recommended Reads From the Engineer's Bookshelf
Max Maxfield
25 comments
I'm not sure if I read more than most folks or not, but I do I know that I spend quite a lot of time reading. I hate to be idle, so I always have a book or two somewhere about my person -- ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...