--- In Electronics_101@yahoogroups.com, Banibrata Dutta <banibrata.dutta@...> wrote:
>
> Wanted to check if it is okay to check for good solder contacts, by doing
> the standard DMM continuity test between the uC pins, and the corresponding
> breakout board header pin ? Or can it damage the IC in some way ?
>
> cheers,
> BD
I would make certain that the RED lead of my DMM went to the pin and the BLACK lead went to the trace. At least this would keep the polarity straight.
Most uCs have pin voltage protection using Schottky diodes between the pin and ground as well as between the pin an Vcc. I wouldn't want to reverse bias them.
I would put my DMM on the Ohm mode. I just connected the DMM in Ohms mode to another DMM in Volts DC mode and came up with just 0.7V. I like that! Barely enough to forward bias a diode. In the other modes (nS, Buzzer and Diode Test), the voltage across the probes was 5V.
I could see drag soldering a 64 pin device, it's pretty easy. But if I had other 0805 components, I would use solder paste and a hot plate.
Make sure you have plenty of SolderWick in a couple of sizes. I usually apply even more flux if I have to break up a solder bridge with SolderWick.
Richard
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