High Accuracy Power Meter

This chapter provides an overview of power meter measurements and how to setup the instrument to use an external USB Sensor in the High Accuracy Power Meter mode. Actual power is measured at the USB sensor connector in dBm and Watts or relative power in dB and percentage. The frequency span and dynamic range for measurements is determined by the USB external sensor.

Note	Check the graph title in the top right of the display to confirm that the instrument is in High Accuracy Power Meter mode. If necessary, press the Menu key to change modes.

In this mode and with an appropriate sensor, the instrument can be used to make high accuracy power measurements including true RMS measurements for both CW and complex digitally modulated signals.

A general overview of USB sensors, including connection and measurements setup, begins in General Measurement Setup Connection.

With the MA24105A in‑line sensor, additional functions are available including: forward and reverse measurements.

• Forward Measurements: Average Power, Crest Factor, Burst Average Power, Peak Envelope Power (PEP), and CCDF.

• Reverse Measurements: Average Power, Reflection Coefficient, Return Loss, and VSWR.

Note	Screen images in this User Guide are illustrations of typical instrument features. Some images may include instruments other than the Site Master S820E. Traces and other display features may differ from the screen displays of your instrument.

Refer to MA24105A Inline Power Sensor for information specific to this in‑line sensor.

Note	Sensors are not included with the Site Master and must be purchased separately. The S820E Site Master data sheet lists compatible sensors. The SC8268 is not a compatible power sensor. It is not valid for use with High Accuracy Power Meter mode.


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