E-11

How to find RC graphically?
We measure DT, and T then we get f₁=2pDT/T,(see Fig 1)

Fig 1 We measure V_bc(1/2 peak to peak value of signal 1) and V_ac(1/2 peak to peak value of signal 2)
then we have cos f₂ = V_bc/V_ac. f₂ = cos^-1(V_bc/V_ac)
f₁ and f₂ are the same physical quantity, but measured in two different ways.
Let f = 1/2(f₁ + f₂)
Draw a straight line from data 1/2pf vs tanf at different frequencies, its slope is RC(see Fig 2)

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