Digital Signal Processing Reference
In-Depth Information
the frequency spectrum of input signals in the frequency range of 100 KHz
to 1.8 GHz. Basically, the hardware in the instrument very rapidly calculates
the Fourier spectrum of the input signal using the Fast Fourier Transform
(FFT).
The front panel of the HP 8590L has three primary operating keys —
frequency
,
span
, and
amplitude
. The following is the sequence of steps to
be performed while operating the HP 8590L Synthesized Function/Sweep
Generator. Please refer also to the HP 8590L information website [1].
•
Turn on the HP 8590L by pressing the power switch
line
. Power is
then applied to all of the HP 8590L circuits, and self tests are per-
formed automatically by the instrument.
•
Press the
preset
key to automatically calibrate the instrument before
starting measurements.
•
Press the
frequency
key. Set the desired frequency range in either
of the following two ways: Set the
start
and
stop
frequencies, or set
the
center
frequency and enter the
span
of frequency. For example,
enter
start
as 0.5 GHz,
stop
as 1.5 GHz, or enter
center
frequency as
1 GHz, with a
span
of 1 GHz.
•
The
amplitude
key is used to set the amount of attenuation required
on input signal, if it is too strong. Note that signals greater than
30 dBm [Power, dBm = 10 Log (Power, mW)] should not be fed into
the instrument, otherwise it will damage the analyzer.
•
If there is an input signal present, the spectrum of the signal will be
displayed on the screen. In order to facilitate measurements, the
following controls can be used:
•
BW (bandwidth):
Press the
bandwidth
key, and lower or in-
crease the
resolution bandwidth
or the
video bandwidth
to
improve the clarity of the displayed spectrum.
•
MARKER:
Press the
marker
key and an option menu is displayed.
Press
peak search
and the instrument will automatically track
the peak value of the spectrum and position the marker cursor
on the peak. Press
next peak right
or
next peak left
to move the
marker to the adjoining right peak or left peak, respectively.
Reference
1.
Agilent Technologies,
Agilent 8590L-Series Portable Spectrum Analyzers, Fact
