HP Cable Box 8591C manual Marker A-SPAN MARKER+ Auto FFT, Marker 4F Step

Spectrum Analyzer Mode Key Descriptions

Spectrum Analyzer Mode Functions

MARKER A-SPAN

MARKER+ AUTO FFT

MARKER +CF

MARKER

-4F STEP

sets the start and stop frequencies to the values of the delta markers. The start and stop frequencies will not be set if the delta marker is off.

Front-Panel Key Access @X&j

functions exactly like the CONTINUS FFT softkey, if the spectrum analyzer is already in zero span. If the analyzer is not in zero span it activates a marker which must be placed on the signal that will have an FFT performed on it and MARKER-+ AUTO FFT must be pressed again. The resolution bandwidth setting must be wide enough to include the displayed modulation signals. Refer to Chapter 5 “Measuring Amplitude Modulation Using the Fast Fourier Transform” for more information.

Press FFT OFF to return the analyzer to normal operation

The analyzer state prior to pressing MARKER+ AUTO FFT can be recalled from register 8.

Front-Panel Key Access c-1

changes the analyzer settings so that the frequency at the marker becomes the center frequency.

Front-Panel Key Access (jj) or (P E A K S E A R C H ]

changes the center-frequency step size to match the value of the active marker. Press [F R E Q U E N C Y ) then

CF STEP AUTO MAN to view the step size. If marker delta is active, the step size will be set to the frequency difference between the markers.

Front-Panel Key Access [mj

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