Agilent Technologies 8510C Manual de Serviço Página 156

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5-20 8510XF Network Analyzer Systems
System Maintenance
Theory of Operation
The detector signal is applied to the ALC circuit, which compares the
detector voltage with a reference voltage, and feeds back a control signal
to the amplifier. The gain of the amplifier is adjusted so that the detector
voltage matches the reference voltage. In this way, the LO input to the
>50 GHz mixers is maintained at a constant level.
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