Externally Leveling The Swept Cw Generator; Leveling With Detectors/Couplers /Splitters - HP 8360 L Series User Manual

Leveling with
Detectors/Couplers
/Splitters
In externally leveled operations, the output power from the swept
CW generator is detected by an external sensor. The output of this
detector is returned to the leveling circuitry, and the output power
is automatically adjusted to keep power constant at the point of
detection.
Figure l-11 illustrates a typical setup for external leveling. When
externally leveled, the power level feedback is taken from the external
negative detector input rather than the internal detector. This
feedback voltage controls the ALC system to set the desired RF
output. Refer to Figure A-l in Chapter 2 for a block diagram of the
swept CW generator's ALC circuitry.
GENERATOR
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I
ALC
Figure l-l 1. ALC Circuit Externally Leveled
RF OUTPUT
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Getting Started Advanced 1-23