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By selecting a frequency sweep range that
is reasonably close to the anticipated
signal points, increased sensitivity is
achieved and harmonic lobes associated
with harmonic analysis and broad
selectivity can be seen.
Note: The SLM1700 is presently
configured to expect a difference of at
least 15% between two frequency
components. So, two frequency
components of say 8kHz and 9kHz would
not be differentiated.
Illustration of a classic wide selectivity
DFT sweep can be illustrated by using
100Hz selectivity and a narrow frequency
sweep around the target signal.
dBm values shown in the SLM display are
based upon a selectable ‘reference
impedance’ option in the system option
screen (SYS key).
The impedances are
implemented
mathematically
rather than physical
impedance change and the options
presently implemented are 50, 75 or 600
Ohms.
