Using the formula given at step 1, the value of C1 and the plot presented in Figure 4, compute Scope input capacitance Cm.
The following formula is used for computing Cm, as stated in step 1 of the lab activity:
Where GHF1 represents the attenuation at high frequencies and is obtained by analyzing the plot given in Figure 4. The value obtained is around 4dB.
The value for C1 can be taken from the materials section: 39pF.
Therefore, the value of Cm is equal to: