Class AmplitudeScanner

examples/backend_frontend/myapps.py:28–61

A simple application that requires a function generator and an oscilloscope.

class AmplitudeScanner(Backend):
    """A simple application that requires a function generator and an
    oscilloscope.
    """

    # Enumerate drivers required by the backend marking them with InstrumentSlot
    fungen = InstrumentSlot
    osci = InstrumentSlot

    def scan_amplitude(self, amplitudes):
        """For each amplitude:
        - scan the amplitude of the function generator.
        - sleeps .3 seconds.
        - measures the trace of the oscilloscope.
        - yields amplitude, data for each amplitude.

        :param amplitudes: iterable of amplitudes.
        """
        for amplitude in amplitudes:
            self.fungen.amplitude = amplitude
            time.sleep(.3)
            data = self.osci.measure()
            yield amplitude, data

    def _scan_amplitude(self, amplitudes):
        """Because scan_amplitude is a generator, this helper functions is used
        to iterate over all the items.
        """
        return list(self.scan_amplitude(amplitudes))

    def default_scan(self):
        """A linear scan from 1 to 19 Volts.
        """
        return list(self.scan_amplitude(Q_(list(range(1, 20)), 'volt')))


class AmplitudeScannerUi(Frontend):