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Performance Verification
SPG 422 Service Manual (B034000 and above)
4–41
g. Without altering any spectrum analyzer controls, set the SPG 422 to
terminate the Genlock 1 input.
h. View the spectrum analyzer B register.
i.
Activate the B, C MINUS A feature.
j.
Turn off the A register, and turn on the marker. The B register now
contains the difference in dB between the two genlock inputs, and the
marker is reading that difference.
k. Check that the difference is greater than 60 dB from 0 to 5 MHz.
l.
Swap the two genlock input cables.
m. Without altering any spectrum analyzer controls, set the SPG 422 to
terminate the Genlock 2 input.
n. View the spectrum analyzer B register.
o. Activate the B, C MINUS A feature.
p. Turn off the A register, and turn on the marker. The B register now
contains the difference in dB between the two genlock inputs, and the
marker is reading that difference.
q. Check that the difference is greater than 60 dB from 0 to 5 MHz.
37. Return Loss Basic Setup
a. Set the spectrum analyzer as follows:
Center Freq.
5 MHz
Freq Span/DIV
1 MHz
Resolution BW
AUTO
Trigger
FREE RUN
Display Mode
PEAK
b. Set up the equipment as shown in Figure 4–13.
c.
With the UNKNOWN arm of the return loss bridge open, set the
tracking generator output amplitude to 1 V
p-p
(
≈
40 dBm) and the
frequency to 5 MHz.
d. You should see a relatively flat trace.
e.
Adjust the reference signal level until the tracking generator signal level
is near the top graticule line. This line represents the return loss reference
for the measurement system, including any non-flatness due to the
bridge, spectrum analyzer, or tracking generator.
Return Loss
Summary of Contents for SPG 422
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