Keysight N5244A/45A Service Guide 4-39
Troubleshooting
Measurement System Troubleshooting
7.
If the signal is present, reconnect all cables, and then continue with
“Checking the A7, A8, A12, and A13 50 GHz Doubler Outputs”
.
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
All Cables—All Options” on page 6-21
. Locate cable W11 on 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.
. If the observed problem was
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
are present, replace the appropriate doubler
board. Refer to
“Removing and Replacing the A4–A17 Boards (For
analyzers with serial numbers prefixed MY/SG/US5150 and below)” on
.
7.
If the signal is present, reconnect all cables, and then continue with
“Checking the Signal Separation Group” on page 4-39
Checking the Signal Separation Group
Before checking the signal separation group assemblies, you must open the
analyzer.
1.
Turn off the analyzer power.
2.
Unplug the power to the analyzer and disconnect all front and rear panel
connections except installed jumpers.
Use an antistatic work surface and wrist strap to reduce the chance of
electrostatic discharge for all of the procedures in this chapter.
Содержание PNA-X N5244A
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