Rigol DSA1030, User Manual

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Front Panel Key Reference RIGOL
User’s Guide for DSA1000 Series 2-85
2.5.3.2 Noise Mkr
Executes the Noise marker function for the selected marker and reads the Power
Spectral Density.
Key Points:

If the current marker selected here is Off in Marker menu, Pressing Noise Mkr
will first enable the marker as a Normal type marker automatically, then start
measuring the average noise level at the marked point and then normalize this
value to 1 Hz bandwidth. During this process, certain compensation is always
taken on the basis of different detection and trace types. The measurement will
be more precise if using the detection type of RMS Avg or Sample.

This function can be used for measuring the Noise ratio.
2.5.3.3 N dB BW
Enables the N dB BW measurement or sets the value of N. The N dB BW denotes the
frequency difference between points that are located on both sides of the current
marker while the amplitude falls off (N<0) or rises (N>0) N dB separately, see figure
below:
Figure 2-26 N dB BW measurement
N dB
N dB
Bandwidth