Fluke 96000 Series Service Manual page 77

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) peak search and note the marker amplitude.
19. Calculate the difference of the maximum and minimum peak searches,
dividing the difference by 2 to determine the peak value. Record this number
as Z
UUT.
Because the reflected signal level is a peak to peak value and the
reference value to which it is compared is a peak value, the reflected
level must be divided by 2 to convert it to a peak value.
20. Compute the voltage reflection coefficient using the following formula:
21. Using the formula below, calculate the UUT VSWR. The calculated value
must be <1.1.
22. Repeat steps 16 through 21 for the remaining test frequencies and maximum
VSWR values in Table 3-16, setting the Spectrum Analyzer center frequency
in step 15 to the test frequency.
23. Repeat steps 5 through 22 for the remaining UUT output levels and maximum
VSWR values in Table 3-16.
24. Set the UUT to STBY.
Note
Z
ρ
=
UUT

Z
Max
ρ
+
1
=
VSWR

ρ
−
1

3
Performance Tests
Performance Test
3-35