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ManualsBrandsAgilent Technologies ManualsAnalytical InstrumentsN5230C
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4-36 Service Guide N5230-90025
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5230C
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 W62, at the A13 fractional-N synthesizer board.
2. Disconnect W62 from A13J101.
3. Connect the spectrum analyzer to A13J101.
4. Set the network analyzer for an S
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measurement at a CW frequency if 500 MHz and observe the
spectrum analyzer measurement.
• The spectrum analyzer should measure a signal at 507.66 MHz.
5. If the signal is not present and the 5 MHz reference signal is present from “Checking the A10 5 MHz
Reference Output, All Bands,” 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.
6. If the signal is present, reconnect cable W62, and then continue with “Checking the A13 Fractional-N
Synthesizer Output, Band 4 (Options 146 and 246)” on page 4-36.
Checking the A13 Fractional-N Synthesizer Output, Band 4
(Options 146 and 246)
Perform this procedure if you observe a problem in band 4 in the C and D receivers.
1. Refer to the block diagram at the back of this chapter and to “Top Cables, Options 146/246 (Side View)”
on page 6-20. Locate semirigid cable W61, at the A13 fractional-N synthesizer board.
CAUTION Be careful not to damage the center pins of the semirigid cable. Some flexing of the cables is
necessary to measure the output.
2. Using a 5/16 inch torque wrench, disconnect W61 at A13J106.
3. Connect the spectrum analyzer to A13J106.
4. Set the network analyzer to an S
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measurement at a CW frequency of 1 GHz.
• The spectrum analyzer should measure a signal at 1 GHz (plus the 7.66 MHz offset).
5. If this 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.
6. If the signal is present, leave the spectrum analyzer connected to A13J106 and continue with “Checking
the A13 Fractional-N Synthesizer Output, Bands 5 through 17 (Options 146 and 246)” on page 4-37.