There are two methods to change the frequency range.
Method 1: Change the frequency by re-sampling the data.
Select [Signal Processing] > [Resampling] in this order from the menu.
Change the "Re-sample Frequency" from 51200 Hz (20 kHz range) to 10240 Hz (4 kHz range).
Method 2: Change the frequency range in the analysis setting.
(This function is available from ver.2.7. )
Select [Waveform Analysis] > [Standard Frequency Analyzer] in this order from the menu.
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Revised:2015.08.17