Anritsu MS9740B - Analyzing Multiple Spectrum Center Wavelength and Spectrum Width (Ndb Loss Method)

Chapter 4 Changing Measurement Conditions
4-16
4.5.3 Analyzing Multiple Spectrum Center Wavelength and Spectrum
Width (ndB Loss Method)
In the ndB Loss method, the level of the part that is ndB loss below the
peak level is the threshold level. The center wavelength, spectrum width
and vertical oscillation mode count from the spectrum of the vertical
oscillation mode exceeding the threshold level is analyzed.
1. Press
f2 ndB Loss
.
2. Select the loss from
f1
to
f4
and enter the value using the rotary knob
and keypad.
The loss input range is 0.1 to 50 dB.
3. The loss, center wavelength λc, spectrum width Δλ and vertical
oscillation mode count N are displayed.
Figure 4.5.3-1 ndB Loss Analysis
The center wavelength (λc) and spectrum width (Δλ) are calculated by the
following formula.
λc = (λ1 + λ2)/2
Δλ = λ2 – λ1
λ1: Peak point wavelength counted from the shortest wavelength in all
wavelengths crossed with the level lowered loss from the peak level
λ2: Peak point wavelength counted from the longest wavelength in all
wavelengths crossed with the level lowered loss from the peak level
The vertical oscillation mode count N is the number spectra for levels
higher than Level Marker D.
Loss (ndB)
Analysis result display field