ambiguity of wavelet transformation

[labmaster]

My goal is to analyze the low freqency for impulsed wave.

Now, I have a real signal acquired 100kHz sampling rate (CaseData.Zip).
The data is a ringing part of impulsed situation.
To see the analysis at low frequency, I did downsampling (1kHz) the original data.

I tried to wavelet transform for the different snapshots for the identical wave (case.jpg).
But, the results were very different depending on the snapshot.
How to interprete the different results? What is the true analysis?

Please guide me to the correct way.

Labmaster.

*)Wavelet example.vi (Version 2009) will require Advanced Signal Processing Toolkt.

[Macpac]

The difference in scalogram is expected since the impulse isn't the same. The impulse signal usually contains high frequency components. 

So, if you want to analysis low frequency components, you can use the Multiresolution Analysis Express VI. I have attached the example here. However, you need to use much longer signals here since the low frequency components simply need longer time to analysis.