96000 Series
Service Manual
3-54
13. Repeat steps 6 through 12 for the next test frequency at +7 dBm listed in
Table 3-23, setting the Spectrum Analyzer center frequency to the test
frequency and recording Z
Max
for each test frequency.
14. Reconnect the directional bridge test port to the UUT and set it to OPER.
15. Set the Spectrum Analyzer display to linear. Set the sweep time to 5 ms,
single sweep.
16. Set the UUT frequency to 500 MHz, set the signal generator frequency to
500.00001 MHz, and set the Spectrum Analyzer center frequency to 500
MHz.
17. Initiate a single sweep. Allow the sweep to complete then perform a
(maximum) peak search. Note the marker amplitude.
18. Perform a (minimum) search and note the marker amplitude.
19. Calculate the difference of the maximum and minimum searches, dividing the
difference by 2 to determine the peak value. Record this number as Z
UUT.
20. Compute the voltage reflection coefficient using the following formula:
Max
UUT
Z
Z
=
ρ
21. Using the following formula, calculate the UUT VSWR. The calculated value
must be <1.1.
ρ
−
+
=
1
1
VSWR
22. Repeat steps 16 through 21 for the remaining test frequencies and maximum
VSWR values in Table 3-23, setting the Spectrum Analyzer center frequency
in step 15 to the test frequency.
23. Repeat steps 4 through 22 for the remaining UUT output levels and maximum
VSWR values in Table 3-23.
24. Set the UUT to STBY.
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