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SDS6000L User Manual
1 9 0 i n t . s i g l e n t . c o m
Professional users who have prior knowledge of FIR filters and are familiar with the operation of this
instrument are encouraged to change the sample rate for the corner frequency of interest. Otherwise,
we recommend using the “Adapt Sample Rate” option. In this mode, the scope forces the Memory
Management Mode to be “Fixed Sample Rate” and automatically adjusts the sample rate to adapt to
the corner frequency setting. For details of the Memory Management Mode refer to the section
“Memory Management”.
Note:
Be aware that when the corner frequency is set very low the sample rate
may not satisfy the Nyquist Theorem (i.e. fs is no longer greater than or equal
to twice the highest frequency of the input). Keep the sample rate reasonable
at all times.
17.5 Frequency Analysis
The result of FFT (Fast Fourier Transform) calculations is the frequency spectrum of the source signal.
The horizontal axis of the FFT display is labeled using frequency (Hz) units instead of time (seconds).
In addition, the vertical axis provides the option of logarithmic scaling (dBVrms/dBArms or dBm).
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