Noise Marker - Keysight N9912A User Manual

SA (Spectrum Analyzer) Mode
SA Mode Settings
Figure 8-7 Display Line with Annotations
How to create and move a Display Line
— Press Limit __8.
— Then
— Then enter a Y-axis value using the

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
8- 32
Display Line OFF
press Enter. Or enter a value using the numeric keypad and press a suffix
key or press Enter.
8-30.
ON.
arrows or the rotary knob, then
PAvg is shown on the FieldFox screen.
Keysight N9912-90001 User's Guide
"Detection