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8. Frequency Response
Test
42. Press DISPLAY LINE
[ENTER]
on the spectrum analyzer. Use the
Display Line to measure the maximum and minimum points on
the trace. (Disregard LO Feedthrough at 1
kHz.) Record the
measurements below.
SIGNAL INPUT 1
(1
kHz to 100 kHz)
Maximum dBm
Minimum dBm
43. Set Display Line to peak of trace at 1 kHz.
44. Key in the following spectrum analyzer settings:
TRACE A
(CLEAR-WRITE)
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.l
kHz
1
kHz
iO0
Hz
45. Set function generator controls as follows:
RANGE Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 (button)
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
MODULATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..all out
46. Adjust function generator FREQUENCY as necessary to place
signal near center graticule line and adjust AMPLITUDE VERNIER
to place peak of signal at Display Line.
47. Key in the following spectrum analyzer settings:
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Hz
&TT!,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Hz
48.
Set
(CF
STEP SIZE] to 100 Hz. Step spectrum analyzer
(CENTER
FF
IEQUENCY]
from 1 kHz to 100 Hz with
a,
while setting
function generator FREQUENCY to match spectrum analyzer
center frequency at each step. Record level-at each setting.
SIGNAL
INPUT
1
1000 Hz
dBm
900 Hz dBm
800 Hz dBm
700 Hz dBm
600 Hz dBm
500 Hz dBm
400 Hz dBm
300 Hz dBm
200 Hz dBm
100 Hz
dBm
Performance Tests 2-29