Under the condition of the whole power supply without electricity, oscilloscope probe and clip the same GND, as shown in figure ripple, and found that all the other PCB measuring points have the same frequency of ripple, could you tell me how to produce the ripple is, how to eliminate? Thank you

CodePudding user response:

Ground loop noise caused by oscilloscope three to two plug in the power plug into try it

CodePudding user response:

The power of the oscilloscope GND cut off

CodePudding user response:

Oscilloscope power plug, introduced the GND can be replaced with no GND socket