Keysight N5224B/25B Service Guide 4-45
Troubleshooting
Measurement System Troubleshooting
7.
If the signal is present, reconnect cables W53 and W54, and then continue
with
“Checking the Receiver Group” on page 4-52
.
Checking the A4 and A17 Source Synthesizer Outputs
1
1.
Refer to the block diagram at the end of this chapter and to
Assemblies and Cables, All Options, Serial Number Prefixes <6021” on
. Locate either the cable W1 at the A4 source 1 synthesizer
board or W2 at the A17 source 2 synthesizer board. (W2 and A17 are only
available in 4-port models and 2-port models with Option 224.)
2.
Disconnect W1 or W2 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. 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 50 MHz reference signal from
the A14 50 MHz Reference Outputs”
is present, replace the faulty
“Removing and Replacing the A4–A17 Boards”
7.
If the signal is present, reconnect cables W1 and W2, and then continue
with
“Checking the A5 and A10 Source Outputs”
.
Checking the A5 and A10 Source Outputs
1.
Refer to the block diagram at the end of this chapter and to
Assemblies and Cables, All Options, Serial Number Prefixes <6021” on
. Locate the 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 50 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.
1. A
4 and A17 synthesizer boards only applies to PNAs with serial number prefixes
<
602
1.
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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 612: ...Appendix 4 Service Guide EEPROM Address Assignments and Location N5224 5A B PNA and N5244 5A B PNA X Instruments...
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