Anritsu MS9740B - Analyzing Single Spectrum SMSR

4.5 Analyzing Waveform
4-15
4
Changing Measurement Conditions
4.5.2 Analyzing Single Spectrum SMSR
The Side Mode Suppression Ratio (SMSR) is the ratio of the spectrum
peak and adjacent mode spectrum levels.
1. Press
f3 SMSR
.
2. Select the side mode from
f1
to
f3
.
2nd Peak: Next highest side mode from maximum level
Left: Peak point at short-wavelength side of max. level
Right: Peak point at long-wavelength side of max. level
3. The selected side mode search method, wavelength difference Δλ and
level difference Δl are displayed. Δl is the SMSR.
Figure 4.5.2-1 SMSR Analysis
The peak wavelength and side mode wavelength at marker A and B are
displayed.
The wavelength difference between marker B and A is displayed as the
wavelength difference Δλ.
The peak level and side mode level at marker C and D are displayed.
The level difference between marker C and D is displayed as the
wavelength difference Δl.
Level
difference
∆
l
Analysis result
display field
Wavelength
difference
∆λ