4-36 Keysight N5244A/45A Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
Checking the A15 13.5 GHz LO Synthesizer Output
1.
Refer to the block diagram at the end of this chapter and to
All Cables—All Options” on page 6-21
. Locate the flexible cable W51 at the
A15 LO synthesizer board.
2.
Disconnect W51 from J1207.
3.
Connect the spectrum analyzer to J1207.
4.
. Set the network analyzer for an
800 MHz CW frequency and observe the spectrum analyzer measurement.
For analyzers with DSP version 4.0, an 807.61 MHz signal should be
present. For analyzers with DSP version 5.0, an 807.44 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 LO signal is not present but the 50 MHz reference signal from
“Checking the A14 50 MHz Reference Outputs”
is present, replace the A15
LO synthesizer board. Refer to
“Removing and Replacing the A4–A17
Boards (For analyzers with serial numbers prefixed MY/SG/US5150 and
7.
If the signal is present, reconnect cable W41, and then continue with
“Checking the A25 HMA26.5 Output”
.
Checking the A25 HMA26.5 Output
1.
Refer to the block diagram at the end of this chapter and to
Cables, Standard 4-Port Configuration, Option 400” on page 6-82
the flexible cable W52 at the A25 HMA26.5.
2.
Disconnect W52 (4-port models) or W80 (2-port models) from the A25
HMA 26.5.
3.
Connect the spectrum analyzer to the open connector on the A25 HMA
26.5.
4.
. Set the network analyzer for an
800 MHz CW frequency and observe the spectrum analyzer measurement.
For analyzers with DSP version 4.0, an 807.61 MHz signal should be
present. For analyzers with DSP version 5.0, an 807.44 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
Содержание PNA-X N5244A
Страница 10: ...8 Keysight N5244A 45A Service Guide Contents ...
Страница 90: ...3 62 Keysight N5244A 45A Service Guide Tests and Adjustments Adjustments 3 ...
Страница 146: ...4 56 Keysight N5244A 45A Service Guide Troubleshooting Instrument Block Diagrams Sheet 4 4 ...
Страница 155: ...Keysight N5244A 45A Service Guide 5 9 Theory of Operation Synthesized Source Group Operation Figure 5 3 Source Group ...
Страница 174: ...5 28 Keysight N5244A 45A Service Guide Theory of Operation Receiver Group Operation 5 Figure 5 6 4 Port Receiver Group ...
Страница 175: ...Keysight N5244A 45A Service Guide 5 29 Theory of Operation Receiver Group Operation Figure 5 7 2 Port Receiver Group ...
Страница 188: ...5 42 Keysight N5244A 45A Service Guide Theory of Operation Noise Measurement Group Operation Option 029 5 ...
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