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FBTMM
FFT Marker to Midscreen
FFTMM
FFT Marker to Midscreen
Changes the FFT midscreen frequency of the spectrum analyzer to the frequency of the
FFI
marker.
Syntax
FFTMM
Equivalent
Softkey:
M&lXER
-)
KID
SCRN
.
Prerequisite Commands: FFTAUTO, FFTSNGLS, FFTCONTS.
Related Commands: FFTMS, MKA, MKF.
Example
OUTPUT
718;"FFTCONTS;"
OUTPUT
718;"MKPK
HI;"
OUTPUT
718;"MKPK
NH;"
OUTPUT
718;"FFTMM;"
Description
Starts the continuous FIT.
Finds
the sign& with the highest amplitude (usually the signal
at 0 Hz).
Finds the signal with the next highest amplitude (usually the
dominant modulation frequency).
Moves the signal to FFT midscreen.
FFI’MM
is performed only if the spectrum analyzer is performing a
FFI’
measurement.
Changing the
FFI
midscreen frequency of the spectrum analyzer also changes the
FFI’
stop
frequency of the spectrum analyzer. Because the
FFl’
stop frequency is limited by sweep time
of the spectrum analyzer, it may not be possible to change the
FFI’
midscreen frequency to the
frequency of the
FFI
marker. If the FFTMM command does not move the signal to the
FFT
midscreen frequency, you should check if the FFT stop frequency is limited by the sweep time
range or the sweep time increments for your spectrum analyzer. The
FFI’
stop frequency is
related to the sweep time as follows:
FFT stop frequency =
400
(Sweep time x 2)
Programming Commands 5-169