Probing Techniques for Accurate Voltage Measurements on Power Supplies with Oscilloscopes

Making oscilloscope voltage measurements on power supplies is fundamental, but not without challenges. Much is 
written on oscilloscopes, but probing techniques are often taken for granted. This application note focuses on probing and covers:
  • Choosing the best voltage probe for the measurement
  • Connecting and using passive voltage probes
  • Connecting and using differential voltage probes
  • Measuring small signals, such as ripple, in the presence of DC or high AC voltage
  • Making differential, or "floating" measurements on components such as switching MOSFETs

 

 

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