Anritsu MS9740B - Setting Items

Chapter 5 Measurement Functions
5-4
5.1.1 Setting Items
This function has following setting items.
● Slice Level
This is the threshold value for calculating standard deviation σ.
● Side Mode
This selects the detected side mode.
2nd Peak: Next highest peak after maximum peak as side mode
Left: Peak at left side of maximum peak as side mode
Right: Peak at right side of maximum peak as side mode
● Kσ
This sets constant for standard deviation σ
K = 2.35 is equivalent to 3 dB down, and K = 6.07 is equivalent to 20
dB down.
● ndB Width
This specifies the cut level used for spectrum width measurement. The
cut level is an attenuator from the peak level.
● Search Resolution
This sets the level resolution (dB) to define the side mode.
Peak P
1
in the following diagram has ripple P
4
of Δl
4
dB. If this ripple is
evaluated as a side mode, the SMSR is not measured correctly. In this
case, if the level resolution is set to a larger value than Δl
4
dB, the P
4
ripple is not detected and SMSR can be measured.
Figure 5.1.1-1 Example of Waveform where 2nd Peak Not Measured
Correctly
P
1
P
2
P
3
P
4
∆
l
1
∆
l
2
∆
l
∆
l
4