4-44 Keysight N5224B/25B Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
Figure 4-12
Comparison of Legacy HMA26.5 (5087-7765) and New HMA26.5
(N5240-60101)
Checking the A26 Splitter Output
1.
Refer to the block diagram at the end of this chapter and to
Cables, Standard 4-Port Configuration, Option 400, S/N Prefix <6021” on
. Locate the semi-rigid cables W53 and W54, at the A26
splitter.
2.
Disconnect W53 and W54, one at a time, from the A26 splitter.
3.
Connect the spectrum analyzer to the open connector.
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.
6.
If the signal is not present but the signal from
is present, replace the A26 splitter. Refer to
Replacing the A26 Splitter” on page 7-41
IMPORTANT! So
me PNAs
have installed
a legacy HMA26.5 (5087-7765)
that is used with a discrete A26 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 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...