Compatibility Of Fft With Other Functions - HP 8590 E-Series User Manual

FFT
accesses the menu of keys to initiate and evaluate a Fourier transform of
the spectrum analyzer displayed data. Activating other spectrum analyzer
Menu
functions will automatically exit the FFT function or will corrupt the display
(see Table 7-7).
Front-Panel Key Access:
FFT OFF exits the FFT mode and menus, returning the spectrum analyzer to normal
operation.
Front-Panel Key Access: (mj
FFT STOP
allows the user to enter the stop frequency for the desired FFT span. This sets
FREQ the spectrum analyzer sweep time by the relationship:
FFT stop freq = 400 / (sweep time x 2)
Note
When using the FFT stop frequency function, the knob and step key
increments are not optimal for positioning the signal. To use the knob or step
keys to position the signal, select sweep time as the active function.
Front-Panel Key Access:
displays the output of the YTO fine-tune DAC, which is produced on the
FINE
TUNE DAC A7 Analog Interface assembly. This is a service diagnostic function and is for
service use only.
Front-Panel Key Access: a
draws a zero-slope line between the coordinate point of the current segment
FLAT
and the coordinate point of the next segment, producing limit-line values equal
in amplitude for all frequencies between the two points. If the amplitude
values of the two segments differ, the limit line "steps" to the frequency value
of the second segment.
Front-Panel Key Access: (Z?%Vj
provides access to the softkeys used for viewing or editing the flatness-
F l a t n e s s
correction constants. This is a service calibration function and is for service
Data
use only.
Front-Panel Key Access: a
Function Compatibility Info
Catalog functions corrupts the display
DLP Editor corrupts the display
Marker Table exits FFT
N dB Points measurement exits FFT
Peak Table
exits FFT
Power Menu measurements exits FFT
Show Options corrupts the display
Time Gate functions exits FFT
TO1 measurement exits FFT
Windows exits FFT
Key Descriptions 7-43