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SIGLENT
User Manual 45
● The function is invalid in Zero span.
7. ΔM->CF
Set the center frequency of the analyzer to the frequency difference between the two markers in Delta
marker type.
● If the Normal marker is selected, this function is invalid.
● The function is invalid in Zero span.
2.3.3 Marker Fn
Special marker functions including Noise Marker, N dB BW and Freq Counter.
2.3.3.1 Select Marker
Select one of the eight markers (1, 2, 3, 4, 5, 6, 7 and 8) and the default is Marker1.
2.3.3.2 Noise Marker
Execute the Noise marker function for the selected marker and read the normalized noise power spectral
density.
● 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 based on 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.
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