Keysight Technologies N5224/5A Service Manual page 114

Troubleshooting
Measurement System Troubleshooting
5. Refer to
frequency banded rather than broadband related, set the analyzer
frequency to the center of the problem band. The spectrum analyzer
should measure a signal above the network analyzer setting. For analyzers
with DSP version 4.0, the signal is 7.61 MHz above the network analyzer
setting. For analyzers with DSP version 5.0, the signal is 7.44 MHz above
the network analyzer setting.
6. If the signal is not present but the signals from
Source Synthesizer Outputs"
board. Refer to
page
7. If the signal is present, reconnect all cables, and then continue with
"Checking the A7, A8, A12, and A13 50 GHz Doubler
Checking the A7, A8, A12, and A13 50 GHz Doubler Outputs
1. Refer to the block diagram at the end of this chapter and to
Assemblies and Cables, All Options" on page
the A7 doubler board, cable W17 on the A8 doubler board, cable W13 on
the A12 doubler board, and cable W15 on the A13 doubler board. (A12 and
A13 are only available in 4-port models and 2-port models with Option
224.)
2. Disconnect cable W11 or W17 or W13 or W15, dependent on which
doubler board is to be checked.
3. Connect the spectrum analyzer to the open connector on the doubler
board to be checked.
4. Set the network analyzer for an 800 MHz CW frequency and observe the
spectrum analyzer measurement. An 800 MHz signal should be present.
5. Refer to the Note on
banded rather than broadband related, set the analyzer frequency to the
center of the problem band. The spectrum analyzer should measure a
signal above the network analyzer setting. For analyzers with DSP version
4.0, the signal is 7.61 MHz above the network analyzer setting. For
analyzers with DSP version 5.0, the signal is 7.44 MHz above the network
analyzer setting.
6. If the signal is not present but the signals from
Source Synthesizer Outputs"
board. Refer to
page
7. If the signal is present, reconnect all cables, and then continue with
"Checking the Signal Separation Group" on page
4-38
the NOTE notice on page
"Removing and Replacing the A4–A17 Boards" on
7-15.
page 4-26. If the observed problem was frequency
"Removing and Replacing the A4–A17 Boards" on
7-15.
4-26. If the observed problem was
"Checking the A4 and A17
are present, replace the appropriate source
6-16. Locate cable W11 on
"Checking the A4 and A17
are present, replace the appropriate doubler
4-39.
Keysight N5224A/25A Service Guide
Outputs".
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