Step Gains - Agilent Technologies 8564EC Service Manual

Spectrum analyzers

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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

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 8564EC

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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