Chapter 8 449
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
HP 8560 E-Series Spectrum Analyzer
Component Level Information.
1. On the spectrum analyzer, press
PRESET, SPAN, ZERO
SPAN, 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. Simultaneously decrease the signal generator output and 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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