Agilent Technologies 8935 Series, Руководство пользователя

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286 Chapter 10
Block Diagrams
RF Input/Output Section
RF Input/Output Section
RF Power Measurement
An RF power measurement can only be made by supplying a signal to
the RF IN/OUT port of the Test Set. See
Figure 10-2 on page 287 . A
power splitter then splits the signal between an RF analysis path and a
power measurement path. The power detector has a direct path to the
A2A36 Receive DSP where average power measurements are made.
There’s also a diode peak detector to provide a peak power
measurement through the A2A33 Measurement assembly.
Accuracy is insured by factory-generated calibration data which is
stored in CAL ROM. The A2A200 100W-attenuator also has calibration
data which affects RF power measurements.
Input Gain Control
Step attenuators in the A2A130 Input/Output Section are switched in
and out, manually or automatically. This keeps the input level within
an optimum range for the mixers, IF amplifiers, and detectors.