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Making Measurements Using Spectrum Analyzer Mode
Using the Time-Gated Spectrum Analyzer Capability Without the Gate Utility (Option 107 only)
7. Set the video bandwidth to a value that is greater than 1 divided by the
gate length. For this example, the video bandwidth must be greater than
l/13
ps,
or 80
kHz.
Press
m,
YID BW
AUTO
MAN , 100
(iZJ
See Figure 5-23. The spectrum analyzer displays only signal 1, not both
signal 1 and signal 2.
/
GTpos
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOG
:
I*!
;
LENGTH
#RES
BW IGG kHz
#UBW
IGG
kHz
#SWP
128
fic.ec
RT
Figure
5.23.
Using Time-Gating to View Signal 1
8. To compare signal 1 to signal 2, we first place signal 1 (trace A) in
the view mode. Press
(ml,
VIEW
A , TRACE A B C (so that B is
underlined), CLEAR WRITE B
9. To view the second signal, change the gate delay so that the gate output
is under the second signal. Since the second signal had a signal delay
of approximately 85
ps,
we set the gate delay to 85 ps plus the pulse
width/2, or 110
ps.
Press
[SWEEP],
Gate Control , GATE DELAY 110
@
to set the gate delay to 110
ps.
Using an oscilloscope can be helpful
in placing the gate output during the pulsed signal. See Figure 5-24.
5-47