mahjongg wrote:as TP2 is actually GND, against what reference is it measured?
Seems nonsense to do a measurement of GND.
Also it seems just noise picked up by the probe to me.
Peaks (TP1-TP2) of about 50mV (0.05V) seem okay to me.
I was too lazy to check the schematics
, so I took a differential measure from the microusb ground.
I was just having fun with my scope, and fount it cool to see the relation between a midory page refresh & supply.
I work in an ASIC dep., where all I do is digital simulation.
Hardware people try to keep us as far as possible from the equipment (scopes & protocol analyzer),
as they believe we are hopeless, which might be true