Table of Contents
Advertisement
3. Impulse and Resolution Bandwidth Accuracy
1. Set the frequency synthesizer for a 15 MHz, + 13 dBm output.
Connect the output of the frequency synthesizer to the EXT
INPUT of the pulse/function generator.
2. Set the pulse/function generator controls as follows:
MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TRIG
EXT INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . positive-going
EXT INPUT LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . midrange
OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pulse
HIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.4V
WIDTH (WID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ns
DISABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
The spectrum analyzer
[
0 dBm throughout steps 4 through 38 to prevent possible IF gain
compression of the pulse signal.
3.
On the spectrum analyzer, press t2-22) and set the controls as
follows:
4.
On the spectrum analyzer, press m, [ATTEN) [x) D, SWEEP
(
PEAK SEARCH
the 3 MHz filter in the HIGH FREQUENCY REPITITION RATE
column in 'Ihble 4-2.
5.
Set the frequency synthesizer
6.
On the spectrum analyzer, press
[
]
0.5 seconds, SWEEP I-1.
SWEEP TIME
7.
Press MARKER
the 3 MHz filter in the LOW FREQUENCY REPITITION RATE
column in Table 4-2.
8.
Calculate the Impulse Bandwidth of the 3 MHz Alter using
formula shown below and record the results for the 3 MHz filter
in 'Ihble 4-2.
BW(i) = High frequency rep rate (15 MHz) x (Low frequency
reading (step 7)/Hi frequency reading(step 4))
9.
Set the frequency synthesizer
10.
On the spectrum analyzer, key in
1 MHz (i),
SWEEP (SINGLE), MARKER
amplitude in Table 4-2
11.
Set the frequency synthesizer [FREQUENCY) to 100 kHz.
12.
On the spectrum analyzer, key in
[
)
0.5 seconds, SWEEP (SINGLE_).
SWEEP TIME
]
setting should remain at
REFERENCE LEVEL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OdBm
).
Note the MARKER amplitude for
to 300 kHz.
[
FREQUENCY SPAN
).
Note the MARKER amplitude for
SEARCH
(
]
to 10 MHz.
FREQUENCY
[
CENTER FREQUENCY
)
4 MHz, SWEEP TIME (AUTO],
SPAN
[
).
Record MARKER
PEAK SEARCH
(
FREQUENCY
Test
15 MHz
12 MHz
3 MHz (i)
]
0 Hz,
the
]
10 MHz,
0 Hz,
Option 462 4-5
Advertisement
Chapters
Table of Contents
