update self.value with basenumber and time interval

        Args:
            baseNumber (str): self.baseNumber
            magnification (str): self.magnification

def _update(self, baseNumber, magnification):
        '''update self.value with basenumber and time interval

        Args:
            baseNumber (str): self.baseNumber
            magnification (str): self.magnification
        '''
        interval = int(baseNumber * magnification)
        self.value = [IntegerSingle(interval)]