Agilent Technologies 8564EC Service Manual page 341

Spectrum analyzers

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Log Ampliﬁer (P/O A4 Assembly)

Total gain can be measured by injecting the speciﬁed power into A4J3

and measuring the total gain provided by A4U201C and A4U201E. The

following procedure provides a means of troubleshooting the linear

1. On the 8564EC or 8565EC spectrum analyzer, press

2. Disconnect W27 (coax 3) from A4J3 and connect the output of a

signal generator to A4J3.

3. Set the signal generator controls as follows:

Amplitude .................................................................. +6 dBm

Frequency ............................................................... 10.7 MHz

4. Simultaneously decrease the signal generator output and 8564EC

or 8565EC spectrum analyzer REF LVL in 10 dB steps to

−90 dBm. At each step, the signal displayed on the spectrum

analyzer should be within one division of the previous position.

5. If a problem exists, isolate it by comparing the actual gain of

A4U201C and A4U201E with those listed in the above gain

6. Reconnect W27 (coax 3) to A4J3.

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