Keysight Technologies N5247B Service Manual page 140

Troubleshooting
Measurement System Troubleshooting
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
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 50 MHz reference signal from
the A14 50 MHz Reference Outputs"
synthesizer board. Refer to
on page
7. If the signal is present, reconnect cables W1 and W2, and then continue
with
Checking the A5 and A10 Source Outputs
1. Refer to the block diagram at the end of this chapter and to
All Cables—All Options, S/N Prefixes <6021" on page
cables W3 and W4 at the A5 source 1 board or cables W7 and W8 at the
A10 source 2 board. (W7, W8, and A10 are only available in 4-port models
and 2-port models with Option 224.)
2. Disconnect cables W3 and W4 or cables W7 and W8, dependent on which
source board is to be checked, at the A7, A8, A12, or A13 40 GHz Doubler
board.
3. Connect the spectrum analyzer to the open connector at the end of the
cable that connects to the source 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
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 40 GHz Doubler
4-44
the NOTE notice on page
7-18.
"Checking the A5 and A10 Source
the NOTE notice on page
"Removing and Replacing the A4–A17 Boards" on
7-18.
4-29. If the observed problem was
is present, replace the faulty
"Removing and Replacing the A4–A17 Boards"
Outputs".
4-29. If the observed problem was
"Checking the A4 and A17
are present, replace the appropriate source
Keysight N5247B Service Guide
"Checking
"Top Cables,
6-21. Locate the
Outputs".