3. Impulse and Resolution Bandwidth Accuracy
Test
1. Set the frequency synthesizer for a 15 MHz, + 13
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ov
HIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WIDTH (WID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ns
DISABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
The spectrum analyzer
[
REFERENCE LEVEL
]
setting should remain at
0
throughout steps 4 through 38 to prevent possible IF gain
compression of the pulse signal.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
On the spectrum analyzer, press
and set the controls as
follows:
15 MHz
12 MHz
3 MHz (i)
MHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OdBm
On the spectrum analyzer, press
SWEEP
MARKER
(
PEAK SEARCH
).
Note the MARKER amplitude for
the 3 MHz filter in the HIGH FREQUENCY REPITITION RATE
column in
4-2.
Set the frequency synthesizer
to 300
On the spectrum analyzer, press
[
FREQUENCY SPAN
]
0 Hz,
[
SWEEP TIME
]
0.5 seconds, SWEEP
Press MARKER
SEARCH
).
Note the MARKER amplitude for
the 3 MHz filter in the LOW FREQUENCY REPITITION RATE
column in
4-2.
Calculate the Impulse Bandwidth of the 3 MHz Alter using
the
formula shown below and record the results for the 3 MHz filter
in
4-2.
BW(i) = High frequency rep rate (15 MHz) x (Low frequency
reading (step
frequency reading(step 4))
Set the frequency synthesizer
(
FREQUENCY
]
to 10 MHz.
On the spectrum analyzer, key in
[
CENTER FREQUENCY
]
10 MHz,
1 MHz (i),
SPAN
)
4 MHz, SWEEP TIME
SWEEP
MARKER
[
PEAK SEARCH
).
Record MARKER
amplitude in Table 4-2
Set the frequency synthesizer
to 100
On the spectrum analyzer, key in
(
FREQUENCY
0 Hz,
[
SWEEP TIME
)
0.5 seconds, SWEEP
Option 462 4-5
