HP 8590 E-Series User Manual

Using the Gate Utility to Simplify Time-Gated Measurements
(Option 105 only)
The time gate allows the user to control when a spectrum analyzer measurement begins and
the length of time during which the measurement is made. The time gate is an RF signal switch
that permits signal into the spectrum analyzer only while the switch, or gate, is closed. Since
the spectrum analyzer receives the signal only when passed through the gate, it will only
display the measurement results from the portion of the signal selected by the time position of
the gate closure. The time gate acts as a time filter, rejecting signals and spectra not occurring
at the desired time.
The time gate utility simplifies the use of the time gate. In the gate utility, the spectrum
analyzer can display the time domain and the frequency domain simultaneously, using two
separate windows. The user is able to adjust the time position of the gate closure relative to
the input signal, using interactive graphic tools in the gate utility. The gate position relative to
the signal is clearly shown in the time domain window. The spectral effects corresponding to
an adjustment of the gate time position are displayed in the frequency domain window. Tools
are provided to aid the user in determining the best gate position, and optimizing the spectrum
analyzer settings for the input signal.
CENTER 980.888 WHz
SPAN B HZ
YRES BW 1.0 MHz YUBW 1 MHz YSWP 18.8 rn5ec
REF
48.8 :
I
dBmV /
PERK j
I __.................................................................................................. :
CENTER 900 MHz SPAN 1.800 GHz
RES BW 3.0 MHz
UBW 1 MHz
#SWP 36.8 msec
Figure 4-17. Time-Gate Utility Display
Gate utility features include:
w Displays time and frequency domains simultaneously.
n Measures continuously.
Interactively controls and displays the gate’s position in time.
n
Note
Option 105, time gate, is required. Option 101, fast ADC, is recommended
psec
(Sweep times down to 20 msec are available without Option 101.)
The gate utility provides tools to make pulsed RF measurements easy. If the user enters the
optimize the resolution bandwidth, sweep time, and video bandwidth for these pulse
parameters. Coupling the spectrum analyzer settings to pulse characteristics allows easy,
Making Measurements 4-l 9

HP 8590 E-Series Specifications

General

Brand	HP
Model	8590 E-Series
Category	Measuring Instruments
Language	English