Model 8904A Adjustments
Network Analyzer Settings
Center Frequency
(MHz)
Requency Span
(kHz)
1.07 300
1.29 300
2.21
500
4. Move jumpers A3J3
or
A10J3 and A3J7
or
A10J7 to the opposite pins (that is,
so
that the jumper
plug shorts the center pin and the opposite outer pin of the circuit board jack). (Refer to the
Component Locator, Figure 5-6.)
5. Connect the equipment
as
shown in Figure 5-1. The network analyzer connects to two SMC
connectors on A3
or
A10. The network analyzer should be set up to drive the Sharp Cutoff
Low-Pass Filter
(at
A3J5
or
A10J5) with its source and to measure the output from the filter (at
A3J6
or
A10J6).
6.
Set the network analyzer as follows:
a. Set the frequency to sweep linearly from
0
to
5
MHz.
b. Set the vertical scale to log.
c. Set the source level to +10
am.
d. Set the input attenuation, and scale
so
that the passband of the displayed filter response
is
at the top of the display and the notch at approximately
1
MHz
is not obscured by noise.
Refer to Figure 5-2.
7. Set the resolution bandwidth to
100
Hz.
8.
Set the network analyzer’s center frequency and frequency
span
as indicated in the following
table.
For
each setting adjust the indicated inductor
so
that the stopband notch
is
centered about
the center frequency.
Inductor
to
Adjust
A3L8
or
A1 OL8
A3L9
or
A1 OL9
A3L7
or
A1 OL7
9. Reconnect the
two
jumpers to their original positions.
10.
Perform Adjustment 5,
Sine
X/X
Compensation.
Adjustment
4
5-9
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