Using Oscilloscopes and Logic analyzers on fine smt devices

Greetings,
  When testing and debugging a circuit, how do you connect the leads
of oscilloscopes and analyzers to the small pins of surface mount
devices?

Any hints or ideas?

Thanks,

-- A

amerdsp wrote:
> Greetings,
>   When testing and debugging a circuit, how do you connect the leads
> of oscilloscopes and analyzers to the small pins of surface mount
> devices?
> 
> Any hints or ideas?
> 
> Thanks,
> 
> -- A
> 
Generally I either press the point of the probe into the solder next to 
a component lead, or I solder a bit of wire-wrap wire & clip on to that. 
  It puts a whole new meaning on "hairy debugging task".

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

"amerdsp" <amerdsp@hotmail.com> a &#4294967295;crit dans le message de news: 
1187925562.629806.212790@q3g2000prf.googlegroups.com...
> Greetings,
>  When testing and debugging a circuit, how do you connect the leads
> of oscilloscopes and analyzers to the small pins of surface mount
> devices?

For ICs, down to around 0,65mm or even 0,5mm pitch, you can find "nano 
clips" distributed by Digikey (see page 1969 on their catalog). Not cheap 
but great.
Robert

Sorry for it maybe offtopic.

If your chip has a JTAG support, instead of oscilloscope/logic
analyzer you may use boundary-scan tools. In this case you do not have
to touch pins at all. The universal software for manual boundary-scan:
Scanseer at http://www.scanseer.com.

On Aug 23, 11:19 pm, amerdsp <amer...@hotmail.com> wrote:
> Greetings,
>   When testing and debugging a circuit, how do you connect the leads
> of oscilloscopes and analyzers to the small pins of surface mount
> devices?

When I'm laying out the PCB, I put 30 mil ICT test points on every
net. These are easy to solder to :)

In comp.arch.embedded,
Robert Lacoste <use-contact-at-www-alciom-com-for-email> wrote:
> "amerdsp" <amerdsp@hotmail.com> a &#4294967295;crit dans le message de news: 
> 1187925562.629806.212790@q3g2000prf.googlegroups.com...
>> Greetings,
>>  When testing and debugging a circuit, how do you connect the leads
>> of oscilloscopes and analyzers to the small pins of surface mount
>> devices?
>
> For ICs, down to around 0,65mm or even 0,5mm pitch, you can find "nano 
> clips" distributed by Digikey (see page 1969 on their catalog). Not cheap 
> but great.

I got some testclips from pomona electronics, these should even handle
0.3mm pitch. I already used them on 0.5, no problem. But these clips are
not at all cheap. But spending time soldering wires to 0.5 and cleaning
up mistakes is more expensive in the end.


-- 
Stef    (remove caps, dashes and .invalid from e-mail address to reply by mail)

On Aug 24, 10:33 pm, larwe <zwsdot...@gmail.com> wrote:
> On Aug 23, 11:19 pm, amerdsp <amer...@hotmail.com> wrote:
>
> > Greetings,
> >   When testing and debugging a circuit, how do you connect the leads
> > of oscilloscopes and analyzers to the small pins of surface mount
> > devices?
>
> When I'm laying out the PCB, I put 30 mil ICT test points on every
> net. These are easy to solder to :)

And thats the right way to go for prototypes. Finished products are
easy to debug with maginifer and sharp solder tip.;-)

ali

On Aug 25, 12:45 pm, Ali <abdulra...@gmail.com> wrote:

> > When I'm laying out the PCB, I put 30 mil ICT test points on every
> > net. These are easy to solder to :)
>
> And thats the right way to go for prototypes. Finished

Absolutely not a prototyping technique - it is a mass production
technique. The board is tested by a large bed-of-nails fixture at very
high speed, after going through reflow and/or wave, and before
depanelization.

"amerdsp" <amerdsp@hotmail.com> wrote in message 
news:1187925562.629806.212790@q3g2000prf.googlegroups.com...
> Greetings,
>  When testing and debugging a circuit, how do you connect the leads
> of oscilloscopes and analyzers to the small pins of surface mount
> devices?
>
> Any hints or ideas?
>
> Thanks,
>
> -- A
>
We found .3 mm nanoclips a year or so ago.  Not sure of the current price, 
but they were a lot less expensive than others at the time.

.3mm clips, $7.00ea
 http://nci-usa.com/downloads/GoLogicPriceList.pdf

Scott