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Troubleshooting
A24 Conducted Filter Board Assembly Troubleshooting
A24 Conducted Filter Board Assembly Troubleshooting
The A24 Conducted Filter Board Assembly is serviced as an assembly only; no
component level repair is supported. For details on the functionality of this
assembly see
Chapter 3, "Assembly
Descriptions". Refer to
Chapter 4 , "Block
Diagrams"
for details.
RF Filtering below 30 MHz
The main function of the A24 Conducted Filter board assembly is to provide
filtering for signals below 30 MHz. These filters are fixed, so while low signal
levels may be corrected by running one or more of the instrument adjustments, bad
filter shapes cannot.
To measure the RF Filter shapes connect either a network analyzer or a signal
analyzer with a tracking generator from the RF INPUT to the RF OUTPUT of the
instrument.
Filter selection can be controlled through the use of the instrument Service menu.
See
Chapter 5 , "Service and Diagnostics Menus," on page 121
for details.
If further fault isolation is needed the response can also be measured directly on
the A24 Conducted Filter board, from A24-J1 to A24-J2. (Refer to
Figure 2-18
and
Figure
2-19) In order to measure the signal remove the A23 Conducted Input board
assembly and the A24 Conducted Filter board assembly and then remove cable
W14. Replace the A23 Conducted Input board assembly and the A24 Conducted
Filter board assembly. Using one of the Type-M troubleshooting cables
(N9039-60034) connected to A24-J2, you may now measure the frequency
response from A24-J1 to A24-J2.
Refer to
Figure 2-20
through
Figure 2-30
for filter shape examples.
84
Chapter 2
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Troubleshooting
