可以拿來擷取訊號，只要硬碟速度夠快，跟上取樣速度的話就可以一值錄訊號下去，一值到硬碟空間不足。-Can be used to capture signals, as long as the hard disk fast enough, to keep up with the sampling rate of one value, then we can go on recorded signals, one value to the hard disk space.