468 Chapter9
IF Section
A5 IF Assembly
Step Gains
Refer to function blocks B, H, and I of A5 IF filter schematic diagram
(sheets 1 of 3 and2 of 3) in the 8560 E-Series Spectrum Analyzer
Component Level Information.
1.On the 8564EC or 8565EC spectrum analyzer, press
PRESET,
SPAN, ZEROSPAN, FREQUENCY, and 1 GHz.
2. Press
CAL and IF ADJ OFF.
3. Disconnect W29 (coax 7) from A5J3 and W27 (coax 3) from A5J5.
4. Inject a −5 dBm, 10.7 MHz signal into A5J3.
5. Monitor the output of A5J5 with another spectrum analyzer.
6.Simultaneouslydecreasethesignalgeneratoroutputand8564EC
or 8565EC spectrum analyzer reference level in 10 dB steps down
to a −50 dBm reference level.
7. At each step, the signal displayed on the other spectrum analyzer
should be close to +10 dBm. (More subtle IF gain problems might
require smaller signal generator and reference level steps.)
8. Reconnect W29 to A5J3 and W27 (coax 3) to A5J5.
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