User`s guide

lttble 4-3. Signal Generator Test Setup Settings
Setting
Frequency
Amplitude
Pulse Modulation
Signal
Signal
Generator 1
Generator 2
50 MHz
50 MHz
-1 dBm
-10 dBm
On
On
1. Set the center frequency of the spectrum analyzer to the frequency of the modulated
signal. Decrease the frequency span of the spectrum analyzer. If necessary, adjust the
reference level of the spectrum analyzer so that the peak signal is displayed near the top
graticule.
&
REF .B dBm
ATTEN i!3 dB
PEAK
LOG
18
dB/
VA S#
SC F
COR
CENT
,*,
,‘.
SPAN
:. : ‘.
5.000 MHz
.I ...,,,, ,,,,,,I,
‘.
.’ ‘.
ZERO
SPAN
LAST
SPAN
50.000 MHz
ES BW 30 kHz
BAND
LOCK
SPAN 5.000 MHz
UBW 38 kHz SUP 2B m5ec
SPAN
ZOOM
FULL
SPAN
Note
Figure 4-22. Setting the Center Frequency, Span, and Reference Level
The Gate Utility can be used to simplify the following steps. See Chapter 7 for
descriptions of the gate utility softkeys.
2. Set the sweep time to be 401 times greater than the pulse repetition interval. For this
example, the pulse repetition interval is 280 ps, so the sweep time is set to greater
than 401 times 280 US. or 0.112 s. For this example, we are using a sweep time
of 120 milliseconds.’ Press @WEEP), 120 @.
-
&
REF .E dBm ATTEN 10 dB
PEAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOG
.I,
18
dB/
0
SWEEPTINE
120 ul5ec
SWEEP
CONT SGL
GATE
ON E
GATE
MENU
1 I .____.._.: . . . ..__... . . . . . . .._. . . . .._.... . ..____... :.spik:.s’.+..I
CENTER 50.000 MHz
RES BW 30 kHz 38
msec RT
Figure 4-23. Setting the Sweep Time
4-28 Making Measurements