LabVIEW: Oscilloscope (Tektronix TDS3012B) waveform scale

1. For input CH1, the amplitude of the signal which is generated from function generator (Tektronix AFG310) ranges from 1 to 10 (20 for dual sides)and the value is an interger. Just check if the amplitude is greater than 5 and use CH1:SCA xxx to scale it (e.g if xxx=3, the waveform will reduce 3 tims. If xxx=0.2, the waveform will enlarge).
2. For output CH2, the amplitude could be any values