An excellent tool in tracking down problems like this is a DSO setup for one shot
trigger, on a level, say a diode drop outside rail, ground, Vdd. And see if you can
capture an event. On Power pins or reset pin or GPIO. For starters. Then using
other channels see if you can ID the source when the event happens.
Also use infinite persistence mode (while in auto or normal sweep) to see what power
rails are poor in terms of pk-pk noise.
You can also use advanced triggering to see if you can find any runts or signals out
of spec.
Regards, Dana.
trigger, on a level, say a diode drop outside rail, ground, Vdd. And see if you can
capture an event. On Power pins or reset pin or GPIO. For starters. Then using
other channels see if you can ID the source when the event happens.
Also use infinite persistence mode (while in auto or normal sweep) to see what power
rails are poor in terms of pk-pk noise.
You can also use advanced triggering to see if you can find any runts or signals out
of spec.
Regards, Dana.