Overview Of The P-Series Wideband Power Sensors; The Internal Zero And Calibration - Keysight n1921a Operating And Service Manual

1 Introduction

Overview of the P-Series Wideband Power Sensors

The P-Series Wideband Power Sensors has two different models.
– 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
Internal Zero and Calibration explains how three objectives in this process are
achieved.
Figure 1-3
1 To account for the environment that the system is working in - the temperature
2 To account for the combining of the sensor and meter, as these may never
20
Figure1-3, "Simplified Sensor Block Diagram"
Simplified Sensor Block Diagram
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.
have been used together as a system.
Keysight N1921A and N1922A Operating and Service Guide
the process for the