4-42 Keysight N5224B/25B Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
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
.
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
Configuration, Serial Number Prefix <6021” on page 6-137
Configurations, Serial Number Prefix
. Locate the
semirigid
cable W52 (
4-port models with a legacy HMA26.5
) or W80
(2-port models
with a legacy HMA26.5
and for all models with a new
HMA26.5
) at the A25 HMA26.5.
2.
Disconnect W52 (4-port models
with a legacy HMA26.5
) or W80 (2-port
models with a legacy HMA26.5 a
nd for all models with a new HMA26.5
)
from the A25 HMA 26.5.
3.
Connect the spectrum analyzer to the open connector on the
A25 HMA 26.5.
4.
Refer to Note on
. 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.
IMPORTANT! So
me PNAs
have installed
a legacy HMA26.5 (5087-7765)
that is used with a discrete A22 splitter. Some PNAs
have installed
a new
HMA26.5 (N5240-60101) with an integrated splitter. To identify which
HMA26.5 is installed in your PNA, refer
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Страница 212: ...5 50 Keysight N5224B 25B Service Guide Theory of Operation Receiver Group Operation 5 Figure 5 17 4 Port Receiver Group...
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Страница 608: ...8 102 Keysight N5224B 25B Service Guide General Purpose Maintenance Procedures Correction Constants 8...
Страница 612: ...Appendix 4 Service Guide EEPROM Address Assignments and Location N5224 5A B PNA and N5244 5A B PNA X Instruments...
Страница 613: ...Installation Note Xxxxx xxxxx 3...