12. Noise Sidebands
5. Key in the following on the analyzer under test:
FREQUENCY
] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.7
[
FREQUENCY SPAN
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.
7.
8.
Wait for completion of the sweep (the asterisk * at the upper right
of the display will disappear), then press MARKER
[
PEAK SEARCH
),
REF LVL).
Change
[
FREQUENCY SPAN
)
to 700 Hz. Wait for completion of the
sweep, then press MARKER
(
PEAK SEARCH
),
Wait again
for the completion of the sweep.
Press
to initiate video averaging. When the
VID AVG readout at the left edge of the display reaches 20, press
TRACE B
9.
10.
Press MARKER
[
PEAK SEARCH
],
In] and key in 320 Hz.
Record the MARKER A amplitude:
See Figure 2-23.
Find the equivalent noise power bandwidth,
for the 10 Hz
resolution bandwidth filter by multiplying the 3
bandwidth
recorded in
2-5 of the Resolution Bandwidth Accuracy Test
by 1.13:
= 1
.
1
3
x
H
z
=
Figure 2-23. Noise Sidebands Measurement
Performance Tests 2-51
