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Figure 1-3
Overview of the P-Series Wideband Power Sensors
The P-Series Wideband Power Sensors has two different models.
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The N1921A has a frequency range of 50 MHz to 18 GHz.
•
The N1922A has a frequency range of 50 MHz to 40 GHz.
The Internal Zero and Calibration
The P-Series Wideband Power Sensor's Internal Zero and Calibration process is
used to combine the power sensor and power meter to make accurate power
measurements.
Referring to Figure1-3, Simplified Sensor Block Diagram, the process for the
Internal Zero and Calibration explains how three objectives in this process are
achieved.
Simplified Sensor Block Diagram
1. To account for the environment that the system is working in - the temperature
and the presence of electromagnetic signals.
This is achieved during the Internal Zero process, where the Diode Detectors are
isolated from the active amplifier circuitry. The process allows the zero
measurement to be made, regardless of the RF input signal, thus allowing the
sensor to remain connected to the DUT. The isolation is achieved by a network
of transistor switches in the zero and calibration path switching.
2. To account for the combining of the sensor and meter, as these may never have
been used together as a system.
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