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SIGLENT
SSA3000X User Manual 45
◆ If the current marker is “Off” in the Marker menu, pressing Noise Marker will first set it to Normal
type automatically; then measure the average noise level at the marked point and normalize this
value to 1 Hz bandwidth. During this process, certain compensation is always made on the basis
of the detection and trace types. The measurement will be more precise if RMS Avg or Sample
detection type is used.
◆ This function can be used for measuring the C/N ratio.
2.3.3.3 N dB BW
Enable the N dB BW measurement or set the value of N dB. The N dB BW denotes the frequency
difference between two points that are located on both sides of the current marker and with N dB fall
(N<0) or rise (N>0) in amplitude as shown in the figure on the next page.
Figure 2-9 N dB BW
When the measurement starts, the analyzer will search for the two points which are located at both
sides of the current point with N dB fall or rise in amplitude and display the frequency difference
between the two points in the active function area. "----" would be displayed if the search fails.
Table 2-28 N dB Noise
Parameter
Explanation
Default
-3 dB
Range
-100 dB ~ 100 dB
Unit
dB
Knob Step
0.1 dB
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