10. Frequency Response Test
lb provide the spectrum analyzer with a 60 MHz to 22
input
signal of sufficient flatness for measuring frequency response and
absolute amplitude accuracy, the synthesized sweeper must be
externally leveled with a power meter, using a relatively slow sweep
time (at least 40 seconds).
43. On the spectrum analyzer, key in
TRACE A
Set
t
he spectrum analyzer controls as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . MHz
VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 dB/DIV
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7
44. On the spectrum analyzer, press MARKER
[
PEAK SEARCH
)
and
adjust the front-panel AMPTD CAL control for a MARKER
indication of -10.00
fO.O1
45. On the synthesized sweeper, key in
[
START
60 MHz,
2.5
150 s, SWEEP
SWEEP
46. On the spectrum analyzer, key in
60 MHz,
2.5
TRACE B
(
CLEAR
-
WRITE
),
TRACE B
MAX HOLD .
47. On the synthesized sweeper, press SWEEP
and wait for a
sweep to complete (150 seconds) and the SWEEP LED to turn off.
As the synthesized sweeper tunes from 60 MHz to 2.5
the
spectrum analyzer frequency response is displayed as TRACE B
(TRACE A displays the current input signal). When the sweep has
completed, the display should appear as shown in Figure 2-20.
Performance Tests
