[sdiy] Pre-test of SMD Soldering Job

[Richie Burnett]

You can check for shorts between adjacent pins with a DMM if you want, but 
if the soldering looks good under a magnifier during a visual inspection i'd 
be tempted to give it a whirl.

You might get some odd resistance readings on your DMM if the output voltage 
is sufficient to forward bias some of the internal workings of the CODEC, so 
don't expect to see particularly high resistance readings.  Also don't be 
suprised if you get a different resistance reading if you reverse the 
polarity of the meter leads!  Some DMMs have a special "in circuit 
resistance measurement" setting that uses a lower output voltage than 
normal, supposedly so as not to forward bias any internal P-N junctions and 
stuff.  This may help if you have the "LV" option available.  Either way a 
modern DMM is not likely to put out sufficient voltage or current to damage 
the device, and a solder-bridge should clearly show up as a dead-short 
(probe lead resistance only.)

I'd be more inclined to worry about anti-static handling precautions than 
damage from DMM testing.  I'd work on a grounded anti-static mat if you have 
one, and don't fidget or shuffle your feet across nylon carpet! ;-)

Good luck,

-Richie,


----- Original Message ----- 
From: "Scott Gravenhorst" <music.maker at gte.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, January 27, 2013 8:07 PM
Subject: [sdiy] Pre-test of SMD Soldering Job


>
> I have soldered a TSSOP package onto a "header" board.  I would like to
> measure between each 2 adjacent pins so that I know there is no short.
> This is a CS4270 codec, likely a CMOS device.  I have a Fluke DMM, can I
> measure resistance with the 200 ohm range?
>
> I don't want to damage the device.  The header board will not be connected
> to anything else.
>
> -- ScottG
> ________________________________________________________________________
> -- Scott Gravenhorst
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