Theory Of Operation - Keysight Technologies U8480 Series Service Manual

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Theory of Operation

Theory of Operation
The U8480 Series is an RF/μW power measurement device which is based on the
thermocouple sensing element in order to provide a wider frequency range, and
most importantly, higher accuracy and repeatability.
This new thermocouple-based USB power sensor is a combination of Keysight's
traditional power meter and power sensor packaged in a smaller form factor. It
offers the advantages of a USB power sensor in terms of connectivity, flexibility,
form factor, and pricing along with the performance of a thermocouple power
sensor.
As a thermocouple-based USB power sensor, the U8480 Series is able to perform
a true average power measurement on both CW and modulated signals. It is a
standalone power sensor which is capable of sensing, signal conditioning,
acquiring, and processing the intended RF/μW signal for measurement.
The U8480 Series measurement functions and performance closely resemble
Keysight's well-known N8480 Series power sensor connected to a power meter.
Figure 3-1
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U8480 Series (AC-coupled) block diagram
Keysight U8480 Series Service Guide