Fluke 96000 Series Service Manual page 94

96000 Series
Service Manual
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
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:
For the 96270A, ensure the Leveling Head output is selected.
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
10. Set the Spectrum Analyzer display units to volts and perform a peak search.
11. Connect a Type-N short to the directional bridge test port. Perform a peak
3-52
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.
bridge. Connect the directional bridge coupled (output) port to the Spectrum
Analyzer input using a 75 Ω to 50 Ω impedance-matching pad. See
Figure 3-14.
PRESET
EXT REF
REF LVL
FREQ
SPAN
Frequency
Amplitude
Output
Signal
Frequency
Level
Output
approximately 3 dB below the reference level line.
the open (75 Ω) termination to the directional bridge test port.
Note the marker indication with the test port open.
search with the test port shorted and note the marker indication. Remove the
short.
Note
On
+10 dBm
500 MHz
Zero Span
500.00001 MHz
0 dBm
On
Note
Leveling Head Output
500 MHz
+7 dBm
OPER