... measure the natural frequency.Long time domain waveform similar to digital tape recorder, record as long as 2 Mb data, replace ... band pass filter, low band pass filter, Sampling length,users can set any value as needed.Lines400, 800, 1600, 3200, 6400, ... time domain waveformMaximal waveform is 10M, maximal analysis frequency of Dual-channel is 10KHz, maximal analysis frequency of single channel is ...