Noise Marker; Band/Interval Power Marker - Keysight Technologies FieldFox A Series User Manual

SA (Spectrum Analyzer) Mode
SA Mode Settings

Noise Marker

For comparison purposes, electronic noise measurements are often displayed
as though the measurement was made in a 1 Hz Res BW. However, making an
actual measurement at a 1 Hz Res BW is extremely slow.
A Noise Marker, unique to SA Mode, mathematically calculates the noise
measurement as though it were made using a 1 Hz bandwidth.
Several data points (or 'buckets') are averaged together to calculate the Noise
Marker readout. To accurately measure noise, the Noise Marker should NOT be
placed on, or too close to, a signal. The distance from a signal depends on
several factors. To know if an accurate reading is being made, move the Noise
Marker until consistent measurements are displayed in adjacent data points.
In addition, when a Noise Marker is displayed, the Detection method is
automatically switched to Average and
This occurs only when Detector is set to Auto. Learn more in
Method" on page
With a Noise Marker present, the Res BW can be changed and the displayed
noise floor will also change, but the Noise Marker readout will remain about
the same.
Noise Markers can be used like regular markers. A Noise Marker is
distinguished from a regular marker by (1Hz) after the marker readout value.
Learn more about regular markers in
How to measure Noise with a marker
— Press Marker to create or select a Normal or Delta marker to use to
— Then More.
— Then
— Then

Band/Interval Power Marker

A Band/Interval Power marker—available in IQA and SA Modes—accumulates
the power that is measured over several adjacent data points (or 'buckets').
The range of buckets being measured is displayed with vertical posts around
the marker. This Band Span value is selectable.
This feature is very similar to a channel power measurement
(CHP)" on page
When the frequency span is set to Zero span, the marker is referred to as an
Interval Band Marker because it averages power over a specific time interval.
In this case the range is specified as the Interval Span. Learn more about Zero
span measurements in
Keysight N9927-90001 User's Guide
188.
measure Noise.
Marker Function
Noise ON OFF.
196).
"Zero Span Measurements" on page
PAvg is shown on the FieldFox screen.
"All about Markers" on page
"Detection
598.
("Channel Power
170.
191