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48 SVA1000X User Manual
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 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.