Fluke 9640A Series, Instruction Manual

Page: 240 / 324

9640A
Instruction Manual
5-50
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
ρ
−
+
=
1
1
VSWR
22. Repeat steps 16 through 21 for the remaining test frequencies and maximum VSWR
values in Table 5-23, setting the spectrum analyzer center frequency in step 15 to the
test frequency.
23. Repeat steps 4 though 22 for the remaining UUT output levels and maximum VSWR
values in Table 5-23.
24. Set the UUT to
STBY
.
Table 5-23. VSWR Test (75
Ω
)
Frequency Level Signal Generator
Frequency
Maximum VSWR
560 MHz 500.000 01 MHz < 1.1
1 GHz 1.000 000 01 GHz < 1.2
2 GHz
+7 dBm
2.000 000 01 GHz < 1.3
560 MHz 500.000 01 MHz < 1.1
1 GHz 1.000 000 01 GHz < 1.2
2 GHz
-3 dBm
2.000 000 01 GHz < 1.3
560 MHz 500.000 01 MHz < 1.1
1 GHz 1.000 000 01 GHz < 1.2
2 GHz
-13 dBm
2.000 000 01 GHz < 1.3