Filter
Top Products
I
-
Using
the
Gate
Utility
to
Simplify
Time-Gated
Measurements
(Option
107
only)
Note that Option 107 is required to perform this application
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
9BB.BBB
RHz SPAN
B
HZ
YRES
BW
1.B MHz WUBW
1
MHz
YSWP
l-3.0
nrec
I
________........____......................................................................
----
.
.
.
.
.
.
.
900 MHz
SPAN
1.800
&Hz
RES BW 3.0 NHz VBW 1 MHz
#SWP 36.8 msec
L
Figure
5-15.
Time-Gate Utility Display
5-28
I-