Model Scope Probe Ground & Signal Lead Impedances

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This discussion focuses on modeling the ground and signal lead impedances of a scope probe, specifically a typical 10x oscilloscope probe. The key components include the impedance of both leads and the capacitance of the probe, measured in picofarads (pF). To accurately model the inductance, users should consider the loop inductance formed when the probe tip and ground lead are connected in close proximity. A schematic for a 10x scope probe is recommended as a starting point for this modeling process.

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I am trying to figure out how to model a scope probe ground lead and signal lead.
Both leads would have some impedance and the probe would have some pf capacitance.
How to deal with both the inductances?
 
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likephysics said:
I am trying to figure out how to model a scope probe ground lead and signal lead.
Both leads would have some impedance and the probe would have some pf capacitance.
How to deal with both the inductances?

Have you seen the schematic for a typical 10x 'scope probe? You can start with that, and add the ground lead inductance into the model. If you use Google Images to search for oscilloscope probe schematic, you get images and links like the one below.

To model the inductance, start with the loop inductance for a loop the same size as that formed when you connect the probe tip and ground lead near each other in a circuit.

http://electronics-diy.com/schematics/967/Scope-Schematic-1.jpg
Scope-Schematic-1.jpg
 

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