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9640A
Instruction Manual
VSWR Test — 75
Equipment Required for this Test:
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Use the following test to verify the UUT's output VSWR using a directional bridge and a
spectrum analyzer.
1. Connect the REF FREQUENCY OUTPUT (rear panel) from the UUT to the
2. On the UUT enable the REF FREQUENCY OUTPUT at 10 MHz. Ensure the
3. Connect the signal generator RF output to the input port of the directional bridge.
In order to determine the reference level setting of the spectrum analyzer,
the UUT must initially be connected to the directional bridge.
4. Connect the UUT to the test port of the directional bridge.
5. Set the spectrum analyzer as follows:
6. Set the signal generator as follows:
7. Set the UUT as follows:
8. Adjust the spectrum analyzer reference level to place the displayed trace
9. Set the UUT to STBY and disconnect it from the directional bridge. Connect the open
5-48
Ω
(Optional)
Signal Generator, 75 Ω
Spectrum Analyzer
75 Ω to 50 Ω impedance-matching pad
75 Ω directional bridge
Precision 75 Ω Open termination
Precision 75 Ω Short termination
75 Ω Leveling Head (supplied with UUT)
spectrum analyzer and signal generator external reference inputs using a BNC tee and
BNC male – male cable assemblies. Set the spectrum analyzer and signal generator
for external frequency reference.
spectrum analyzer and signal generator external reference frequency inputs are
enabled for input at 10 MHz.
Connect the directional bridge coupled (output) port to the spectrum analyzer input
using a 75 Ω to 50 Ω impedance-matching pad. See Figure 5-13.
PRESET
EXT REF
REF LVL
FREQ
SPAN
Frequency
Amplitude
Output
Frequency
Level
Output
approximately 3 dB below the reference level line.
(75 Ω) termination to the directional bridge test port.
Note
On
+10 dBm
500 MHz
Zero Span
500.00001 MHz
0 dBm
On
500 MHz
+7 dBm
OPER
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