""" Interface definition for oscilloscope devices. """

class Oscilloscope:
    """
    This interface specifies the common API for all
    supported oscilloscope devices.
    """
    def measureAmplitude(self, channel: int) -> float:
        """ Return amplitude measurement on specific channel. """

    def measurePeakToPeak(self, channel: int) -> float:
        """ Return peak-to-peak measurement on specific channel. """

    def measureRMS(self, channel: int) -> float:
        """ Return RMS measurement on specific channel. """

    def measureFrequency(self, channel: int) -> float:
        """ Return frequency measurement on specific channel. """

    def setVoltsPerDivision(self, channel: int, volts: float) -> None:
        """ Sets the vertical scale of specific channel. """
    
    def getDivisionsDisplayed(self) -> int:
        """ Returns the number of vertical divisions on the device display. """