Field Strength Measurements - Keysight N9912A User Manual

How to Check for a Compressed Measurement
 Using a marker at the signal peak, make note of the signal power level.
 Increase the RF Attenuation level by 5 dB.

Field Strength Measurements

To measure the strength of any signal transmitted through the air, an antenna must
be connected to the FieldFox. The Field Strength feature allows you to enter the
frequency response of the receiving antenna (the Antenna Factor) and associated
cabling, and then have amplitude corrections automatically compensate the
displayed trace for that response.
Field Strength Measurements
Trace 1 - Corrected trace with antenna factor. (Antenna = ON, Apply Corr = ON)
Trace 2

 Learn how to set Y-Axis Units on page 72.
 Use a Band Power marker to measure total power over a range of frequencies.
How to select correction for Field Strength measurements
The Antenna and Cable correction data survives a Mode Preset and Preset.
All Correction ON/OFF states survive a Mode Preset, but NOT a Preset.
 Press Scale/Amptd .
 Then
 Then
 Then choose from the following:
SA (Spectrum Analyzer) Mode
If the signal level does NOT change, then NO compression exists. This indicates
o
that the signal is in the linear region of the FieldFox receiver.
If the signal level DOES increase, then the receiver was compressed. Set the RF
o
Attenuation value at the setting when further increases no longer result in an
increase in the displayed power level.
- (View) Uncorrected trace (Apply Corr = OFF)
Red Trace - Current correction factor. See below.
Learn how on page 156.
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Corrections
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