Caution
If a dc block is not used, damage to the HP
8566A/B
results. The
HP
8566A/B
and many other spectrum analyzers have dc-coupled inputs and
cannot tolerate dc voltages on their inputs.
6. Set the HP
8566A/B
to single trigger and press TRACE A [CLEAR-WRITE]. Trigger a sweep
of the HP
8566A/B
and the signal generator simultaneously. The HP
8566A/B
shows the
passband
of the 4.8 kHz IF filters. The 3 dB bandwidth of the filters should be 1.2 kHz.
The
passband
of the filters should be flat within 2 dB over 800 Hz.
7. If continuing to the next procedure,
“4.8 kHz and 10.7 MHz IF Filters,” press TRACE A
(VIEW) on the HP
8566A/B.
8. Reconnect W27 (coax 3) to A4J3.
4.8
kHz
and 10.7 MHz IF Filters
1. Connect a 10.7 MHz signal from a signal generator to the input of the A5 IF assembly and
decrease the signal generator level to -50
dBm.
2. Fine tune the frequency of the signal generator to center the signal on the screen. Set the
signal generator to sweep one 2 kHz span about this center frequency. Set the spectrum
analyzer to single sweep.
3. Set the HP
8566A/B
to 4.8 kHz center frequency and 2 kHz span.
4. Connect the VIDEO OUTPUT (rear panel) of the spectrum analyzer through a 20 dB
attenuator and dc block to the input of the HP
8566A/B.
Set the sweep time of the
HP
8566A/B
to 10 seconds.
Caution
Damage to the HP
8566A/B
results if a dc block is not used. The HP
8566A/B
and many other’spectrum analyzers have dc-coupled inputs and
cannot tolerate dc voltages on their inputs.
5.
Set the HP
8566A/B
to single trigger and press TRACE B (CLEAR-WRITE). Trigger a sweep
of the HP
8566A/B
and the signal generator simultaneously. The HP
8566A/B
should
show a 3 dB bandwidth of approximately 320 Hz.
6.
To view the bandwidth of the 10.7 MHz IF filters alone, proceed as follows:
a.
b.
C.
d.
e.
If the peak of the active trace (trace B) is not at the same amplitude as the stored trace
(trace A), adjust the HP
8566A/B
reference level as necessary and repeat step 5.
Press TRACE B
m
on the HP 8566.
On the HP 8566, press
[A--B)A).
The bandwidth of the 10.7 MHz filters is displayed
upside down and may have “wings” toward the sides. These “wings” should be ignored.
Press
(A=),
DISPLAY LINE
[a’).
Adjust the display line such that it is at the
peak of trace B (the dimmer trace). Press
(B--DL)B].
The signal disappears from the
screen; it is actually below the bottom of the screen.
On the HP
8566A/B,
press [FREQUENCY SPAN), 0 IHz),
(j-1,
1
(dB),
(-1,
50
m.
Disconnect the signal from the RF INPUT. Press TRACE A CLEAR WRITE ,
(SINGLE).
8-18 IF Section
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