HP 8590 E-Series User Manual page 220

displays the analog output of the YTO coarse-tune DAC located on the A7
COARSE
Analog Interface assembly. This is a service diagnostic function and is for
TUNE DAC
service use only.
Front-Panel Key Access: ICAL)
HP 859ZL, HP 8593E, and HP 8596E only.
COMB GEN
turns the internal comb generator on or off. Connect a cable between 100 MHz
ON OFF
COMB OUT and the spectrum analyzer input.
Front-Panel Key Access: Cm)
initiates a variety of tests to check the major functions of the spectrum
CONF
analyzer. The confidence test function checks that the video bandwidths
TEST
change, the noise floor level decreases as the resolution bandwidth narrows,
the step gains switch, and the 3 dB bandwidths of the resolution bandwidths
are correctly set. CNF TEST PASS is displayed if the confidence test passes.
Front-Panel Key Access: a
accesses the softkey menu used for printer and plotter configurations, the
time and date display functions, changing the current prefix, memory card
configuration functions, disposing of user-defined variables and programs from
spectrum analyzer memory, changing the spectrum analyzer address or the
baud rate, displaying the installed options on screen, and changing the format
of the MONITOR output. Pressing [m) will clear an SRQ error message
from the screen. Pressing [CONFIG) after the spectrum analyzer has been
placed in the remote mode places the spectrum analyzer in the local mode and
enables front-panel control. During remote operation, an R appears in the
lower-right corner of the screen indicating remote mode. Pressing c-1
removes the R annotation from the lower-right corner.
CONT
sets the functions in the Power Menu so that they make the measurement at
the end of every sweep. After a power measurement is activated, pressing
CONT MEAS or SWEEP CONT puts the spectrum analyzer into a continuous
sweep mode and recalculates the results at the end of each sweep.
Front-Panel Key Access: (MEAS/USER)
initializes the fast Fourier transform (FFT) function, puts the spectrum
CONTINUS
analyzer in continuous sweep and performs an FFT at the end of each
FFT
sweep. If the FFT function is already active, it puts the spectrum analyzer in
continuous sweep and performs FFT?s.
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 Using the Fast Fourier
Transform Function," for more information.
Front-Panel Key Access: I-)
Key Descriptions 7-27