User`s guide

SINGLE
FFT
initializes the fast Fourier transform (FFT) function. If the spectrum analyzer
is in single sweep mode, an FFT is performed on trace A without taking a new
sweep. If the spectrum analyzer is in continuous sweep, it is put in single
sweep, a sweep is taken, and the FFT is performed. If the spectrum analyzer
is already in the FFT mode it is put in single sweep, a sweep is taken, and an
FFT is performed. Pressing SINGLE FFT again or pressing @‘5X@-] will take
another sweep and perform an FFT.
After using the FFT function, the display is in log mode. The markers are put
in the FFT mode for use in evaluating the data. The signal being transformed
is in trace A and the Fourier transform of the signal is in trace B. (Any
information that was in trace B and C will be lost.) Press FFT OFF to return
the spectrum analyzer to normal operation.
Refer to Chapter 4, “Measuring Amplitude Modulation With the Fast Fourier
Transform Function,” for more information.
Front-Panel Key Access: (-1
SINGLE
MEAS
sets the functions in the Power Menu so that they make the measurement on a
single sweep. After a power measurement is activated, pressing SINGLE MEAS
or [sGLSWP_) initiates a sweep and recalculates the measurement results.
Front-Panel Key Access: (-1
SLOPE
draws a straight line between the coordinate point of the current segment and
the coordinate point of the next segment, producing limit-line values for all
frequencies between the two points.
Front-Panel Key Access: (-1
CSPAN) or SPAN
activates the SPAN function and accesses the frequency-span functions.
Pressing SPAN allows the user to change the frequency range symmetrically
about the center frequency. The frequency-span readout describes the total
displayed frequency range; to determine frequency span per horizontal
graticule division, divide the frequency span by 10.
Front-Panel Key Access: ISPAN)
SPAN
ZOOM
finds the highest signal peak on-screen. If a marker is not already on the peak,
it places a marker on it, turns on the marker-track function, and activates the
span function. Pressing SPAN ZOOM performs the routine similar to pressing
the following keys: (PEAK SEARCH), (MKRJ MK TRACK ON OFF (ON), and
m).
Front-Panel Key Access: ISPAN)
SPEAKER
ON OFF
SPECTRUM
ANALYZER
Option 102, 103, or 301 only.
turns the internal speaker on and off. The volume from the speaker is
controlled by the front-panel volume control knob and FM GAIN (when using
FM demodulation). There is no output from the speaker unless demodulation is
turned on. Pressing CPREsET] sets SPEAKER ON OFF to ON.
Front-Panel Key Access: [AUXCTRL)
sets the spectrum analyzer to the spectrum analyzer operating mode and
accesses the PRESET SPECTRUM softkey function.
Front-Panel Key Access: (MODEI) or c-1
7-80 Key Descriptions