Sets whether the function generator is outputting a voltage.

def set_output(self, state):
        """Sets whether the function generator is outputting a voltage."""
        freq = float(self.instr.query('FREQ?'))
        if freq > 4.05e9:
            if state:
                self.instr.write('ENBH 1') #enable output
            else:
                self.instr.write('ENBH 0')
        elif freq < 62.5e6:
            if state:
                self.instr.write('ENBL 1') #enable output
            else:
                self.instr.write('ENBL 0')