Oscilloscope noise reduction when measuring IC voltage
Here are some parameters for the channel used for measuring voltage:
  
  vertical scale to 50 mV/div, the offset to 150 mV, and enable 20MHz
  BWL, Sampling rate is 2Gs/S 200ms.


Don't enable 20MHz BWL - this may be telling lies about what you are seeing on the scope - the captured data may be unfiltered.