Service Guide E8361-90001 4-55
PNA Series Microwave Network Analyzers Troubleshooting
E8361A Measurement System Troubleshooting
2. Disconnect W94 from A10J11.
3. Connect the spectrum analyzer to A10J11.
4. The spectrum analyzer should measure a signal at 5 MHz.
5. If no 5 MHz signal is present, replace the A10 frequency reference board. Refer to
“Removing and Replacing the A6, A8, A9, and A10 Boards” on page 7-18.
6. If the 5 MHz signal is present, reconnect cable W94, and then continue with “Checking
the A9 Fractional-N Synthesizer Band 1 Output” on page 4-55.
Checking the A9 Fractional-N Synthesizer Band 1 Output
Perform this procedure if you observe a problem in band 1 of the frequency offset receiver.
1. Refer to the block diagram at the back of this chapter and to “Top Cables, All Options
Including 080” on page 6-19. Locate semi-rigid cable W92, at the A9 fractional-N
synthesizer board.
CAUTION Be careful not to damage the center pins of the semi-rigid cable. Some flexing
of the cables is necessary to measure the output.
2. Disconnect W92 from A9J101.
3. Connect the spectrum analyzer to A9J101.
4. Set the network analyzer for a 500 MHz CW frequency and observe the spectrum
analyzer measurement.
• The spectrum analyzer should measure a signal at 508.33 MHz.
5. If the 508.33 MHz signal is not present and the 5 MHz reference signal is present from
“Checking the A10 5 MHz Reference Output, All Bands,” replace the A9 fractional-N
synthesizer board. Refer to “Removing and Replacing the A6, A8, A9, and A10 Boards”
on page 7-18.
6. If the signal is present, reconnect cable W92, and then continue with “Checking the A9
Fractional-N Synthesizer Band 2 Output” on page 4-55.
Checking the A9 Fractional-N Synthesizer Band 2 Output
Perform this procedure if you observe a problem in band 2 of the frequency offset receiver.
1. Refer to the block diagram at the back of this chapter and to “Top Cables, All Options
Including 080” on page 6-19. Locate semi-rigid cable W91, at the A9 fractional-N
synthesizer board.
CAUTION Be careful not to damage the center pins of the semi-rigid cable. Some flexing
of the cables is necessary to measure the output.
2. Using a 5/16-inch torque wrench, disconnect W91 at A9J106.
3. Connect the spectrum analyzer to A9J106.
4. Set the network analyzer to a CW frequency of 1 GHz.
• The spectrum analyzer should measure a signal at 1.008 GHz.
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