An attenuator probe employed with oscilloscopes was designed to reduce the magnitude of the input voltage vi by a factor of 10. As shown in Fig. 7.149, the oscilloscope has internal resistance Rs and capacitance Cs while the probe has an internal resistance Rp If Rp is fixed at 6 M Ω find Rs and Cs for the circuit to have a time constant of 15 μs.

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Probe Scope 0