Agilent Technologies 8560E User Manual page 237

EXTERNAL
EXTERNAL MIXER
No external mixing capabilities are available with an 8560E/EC Option
NOTE
002.
Resolution bandwidths less than 300 Hz are not available with external
mixers.
FACTORY PRSEL PK
FFT MEAS
Pressing FFT MEAS sets the analyzer into single-sweep mode. To leave
NOTE
the FFT measure mode, set the sweep to continuous by pressing
SWEEP CONT SGL (CONT) under either the
Chapter 4
Sets the trigger to external mode. Connect an external
trigger source to J5 EXT/GATE TRIG INPUT on the
rear panel of the spectrum analyzer. The source must
range from 0 V to 5 V dc (TTL). The trigger occurs on
the rising or falling edge of the signal (about 1.5 V) as
selected by the TRIG POL POS NEG softkey function.
Front-panel key access:
Not available with Option 002 and non-functional in
instruments with Option 327. Accesses a menu of
functions that allow you to extend the spectrum
analyzer frequency range using external mixers. These
functions include band and harmonic selection,
amplitude correction, signal identification (if available),
and setting the external mixer bias.
Front-panel key access:
Available only with internal mixing of signals >2.9
GHz. Restores the factory preselector-peaking data and
makes this data the current preselector data. This data
is stored in the factory data table and can only be
changed by service personnel. For more information on
the preselector data tables, refer to the RECALL
PRSEL PK softkey.
Front-panel key access:
Performs a discrete Fourier transform on the input
signal. It is intended to convert zero-span information
into the frequency domain, allowing the demodulated
signal to be viewed as spectral data relative to the
frequency of the modulation. However, performing a
fast Fourier transform (FFT) on a frequency sweep will
not provide time-domain results. When FFT MEAS is
pressed, the function sets the analyzer to
sample-detection mode and takes a sweep to obtain a
sample of the input signal. Then the spectrum analyzer
executes a series of computations on the time-domain
data to produce the frequency-domain results.
Key Function Descriptions
Key Descriptions
TRIG
AUX CTRL
RECALL
or
SWEEP TRIG
key.
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