wsmysyn

Nubility posted on 2023-8-25 20:54 No, even a 100M oscilloscope cannot be used by two people

This is too much to ask.

Nubility

xutong posted on 2023-8-25 17:26 If there are many paths, you must use a logic analyzer. It is a bit outrageous to measure them one by one with an oscilloscope. It is okay to measure the current of dozens of A with a shunt resistor. Even if it is 1mR30A, it is only 30mV...

30mV may be too high. The allowed value of CPU core voltage is only about 15mV.

xutong

Nubility posted on 2023-8-26 23:49 30mV may be too high. The allowed value of CPU core voltage is only about 15mV

Then you can only use a smaller current-sense resistor.

Nubility

wsmysyn posted on 2023-8-25 19:59 Big chips are complicated, with all kinds of power supplies. This is normal. If you have ATE equipment, everything is easy. The disadvantage is that it is expensive. I am now working on a BGA3700...

When I measured the power ripple, the different forces I pressed on the test point and the component pin with the probe would result in different waveforms. It was amazing. I don't know if the probe was oxidized, so the contact was not good.