EEVblog #588 - How To Do PCB Production Testing

[ConnorGames]

If you get the boards that failed testing back from the assembler, it would be AWESOME if you could do a video where you identified the faults. It could let many hobbyists who don't have the time or money to make 1800 boards know what failures are common and how to avoid them.

[Alphatronique]

Hi you what a good start

http://communities.mentor.com/mgcx/servlet/JiveServlet/download/28883-8838/PCB%20Design%20Optimization%20Starts%20in%20the%20CAD%20Library.pdf

then  remain of the series

http://blogs.mentor.com/tom-hausherr/blog/2010/09/22/pcb-design-perfection-starts-in-the-cad-library-part-2/

and remember to always use thermal relief on copper-pour / plane

whit this you cover 90% of the issue ...  and make your assembler happy

but please use only  IPC7351B  forgot about the new IPC7351C   that was crap for low volume 

if you follow this and have defect ,issue was probably on the assembler side or the PCB shop 

Best regard

[Stonent]

Most hand-held cordless drills have an adjustable torque setting before they click. You could probably just get a drill with a socket end and set it appropriately and just go zip, zip, zip on the nuts and have reasonable certainty that they got torqued well.

[Simon]

if the drills have known torque points yes, every model of drill may be different

[merelyuseful]

Hi Dave,

The track leading from the bad joint looks pretty wide. Is there a systematic way to work out the trade-off between having good conducting tracks vs too much heat drain from the solder joint? 

Neil

[ErikTheNorwegian]

I missed out where to buy one of them, cant find it in the shop...

[Ross_ValuSoft]

I noticed that you did not (yet) have a "from" address on the packages going to Aust Post.

Yes, there is a return address on them. Where did you see otherwise?

This image. But as I said "(yet)". Good to know.

Cheers,

Ross

[alter Ratz]

Hi Dave,

In my opinion the current source(s) seems a little unhandy and is IMHO a thing which could be broken easily. I am just wondering what made you choose this design solution instead of a cable based solution which an switch to change the curent (which also would eliminate the need to plug/unplug the current source for each current range change). Also the 1A range also will need a bigger battery.

Best Regards,
Bernhard

PS: Like a previous poster already pointed out a video showing the test at the manufacturer would be welcome.

[SeanB]

Probably based on things to hand, like a lot of those coin cell holders, a component list of common parts and then again a desire to make it simple and match the boards themselves in form factor. Bigger batteries yes, but as the current draw on the low ranges is not going to kill the cells for at least 300 or so 1 second tests not a big issue. I think the 1A version will be bigger and use AA cells or something similar. Even a 12v A23 cell to drive the reference and a single AA cell to provide the current will be usable for thousands of tests.

[NiHaoMike]

I wonder why wasn't the uCurrent (and by extension, the test jigs) designed to use AA or AAA batteries. They're far more common than coin cells and there seems to be enough room to fit them inside the box. That also eliminates the need for the rail splitter.

[DavidDLC]

Misleading video title, It should be: How to do PCB production testing for the microcurrent.

PCB production testing can be very simple or extremely complicated, when I read the video title I was expecting something else.

I have seen the same misleading titles with other videos, my recommendation is to have the title more specific of what exactly the video is.

David.

[EEVblog]

Misleading video title, It should be: How to do PCB production testing for the microcurrent.
PCB production testing can be very simple or extremely complicated, when I read the video title I was expecting something else.
I have seen the same misleading titles with other videos, my recommendation is to have the title more specific of what exactly the video is.

No surprises for guessing that I do chose titles that will optimise my SEO. But I don't think it's misleading, it contains tips on production testing, sure, it's using a specific example, but tips none the less. Also, the first line of my description text tells you precisely what the video contains. I also can't make titles that are arbitrarily long, shorter ones work better.

[EEVblog]

I wonder why wasn't the uCurrent (and by extension, the test jigs) designed to use AA or AAA batteries. They're far more common than coin cells and there seems to be enough room to fit them inside the box. That also eliminates the need for the rail splitter.

You can run it off 3 x AAA's (only AAA's fit in the existing box), but you can't do the split supply with them, because you'd need 4 to balance it, and 4 is too high a voltage.
Also, split battery supply changes the requirement for how the battery OK LED works.

[calexanian]

#247 arrived today in Fresno California. Also the TSpring shirt arrived as well. Just in time for the mini hamfest tomorrow! I may just have to do a burden voltage demonstration.