Technical data

Service Guide N5230-90025 4-37
PNA Series Microwave Network Analyzers Troubleshooting
N5230C Measurement System Troubleshooting
Checking the A13 Fractional-N Synthesizer Output, Bands 5 through 17 (Options 146 and 246)
Perform this procedure if you observe a problem in bands 5 through 17 in the C and D receivers.
1. Set the network analyzer for an S
33
measurement at a CW frequency of 2 GHz.
• The spectrum analyzer should measure a signal at 2 GHz (plus the 7.66 MHz offset).
2. If the signal is not present, replace the A13 fractional-N synthesizer board. Refer to “Removing and
Replacing the A12 Multiplier and the A13 Fractional-N Synthesizer Boards” on page 7-20.
3. If the signal is present, reconnect cable W61, and then continue with “Checking the A12 Multiplier
Output, All Bands (Options 146 and 246)” on page 4-37.
Checking the A12 Multiplier Output, All Bands
(Options 146 and 246)
Perform this procedure if you observe a problem in all bands in the C and D receivers.
1. Refer to the block diagram at the end of this chapter and to “Top Cables, Options 146/246 (Side View)”
on page 6-20. Locate the flexible cable W63, at the A12 multiplier board.
2. Disconnect W63 from the A12 board.
3. Connect the spectrum analyzer to the open connector.
4. Set the network analyzer for an S
33
measurement at a CW frequency of 2 GHz and observe the spectrum
analyzer measurement.
• The spectrum analyzer should measure a signal at 2 GHz (plus the 7.66 MHz offset).
5. If the signal is not present and the signals are present from “Checking the A13 Fractional-N Synthesizer
Output, Bands 5 through 17 (Options 146 and 246),” replace the A12 multiplier board. Refer to “Removing
and Replacing the A12 Multiplier and the A13 Fractional-N Synthesizer Boards” on page 7-20.
6. If the signal is present, reconnect cable W63, and then continue with “Checking the Signal Separation
Group” on page 4-38.