Keysight N9038A Measurement Guide

73
Measuring Noise
Measuring Signal-to-Noise
Read the signal-to-noise in dB/Hz, that is with the noise value determined for a 1 Hz
noise bandwidth. If you wish the noise value for a different bandwidth, decrease the
ratio by . For example, if the analyzer reading is −70 dB/Hz but you
have a channel bandwidth of 30 kHz:
NOTE When Noise Marker is activated, the display detection mode is set to Average.
NOTE When using the Noise Marker, if the delta marker is closer than one quarter of a
division from the edge of a discrete signal response, the amplitude reference signal in
this case, there is a potential for error in the noise measurement. See “Measuring
Noise Using the Noise Marker” on page 74.
Figure 7-1 Measuring signal-to-noise
Step Action Notes
10 log× BW()
S/N 70– dB/Hz 10 30 kHz()log×+ 25.23 dB– 30 kHz()⁄==

Keysight N9038A Specifications

General

Brand	Keysight
Model	N9038A
Category	Measuring Instruments
Language	English