S331L UG PN: 10580-00321 Rev. M 6-1
Chapter 6 — High Accuracy
Power Meter
6-1 Overview
This chapter provides an overview of power meter measurements and
how to set up 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.
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 on page 6-2.
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.
Refer to “MA24105A Inline Power Sensor” on page 6-12 for information
specific to this in-line 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.
Note
Sensors are not included with the Site Master and must be
purchased separately. The S331L Site Master data sheet
lists compatible sensors.
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