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November 2018 StudentZone Quiz Solution

Question 1:

Considering the typical probe schematic presented in Figure 7, determine how the adjustable capacitor value can be computed to compensate the frequency response.

Answer 1:

In order to obtain a proper adjustment the following relationship must be met:

Where we denote:

R1 = Probe resistance

C1 = Probe parasitic capacitance

R2 = Scope input capacitance

C2 = capacitance formed by the adjustable capacitor in parallel (Cadj) with the parasitic input capacitance (Cp)

 

Therefore, we obtain:

 

Resulting the adjustable capacitor value: