class Oscilloscope:
    def __init__(self):
        raise Exception("This class should not be instantiated directly, please extend it instead")

    def measureAmplitude(self, channel: int) -> float:
        pass

    def measurePeakToPeak(self, channel: int) -> float:
        pass

    def measureRMS(self, channel: int) -> float:
        pass

    def measureFrequency(self, channel: int) -> float:
        pass