Tektronix OM4006D, User Manual, Page: 74 / 205

Operating basics
Current Signal Spectrum
plot
The Current Signal Spectrum plot is accessed by clicking on the spectrum icon
button on the Home tab. Right-click on the plot to select what to display. The
OUI displays the input signal spectrum by default.
Measurements Statistics
table
The Measurement Statistics table is displayed by the Tabular-Data menu (click on
the Tabular Data icon). The Measurements Statistics table contains essentially
every measurement made by the OUI with statistics. In cases such as EVM or
Q-factor for QAM, where there may be too many numbers to list in the table, the
table shows an average for each tributary. The detailed values by constellation
group are found on the constellation, eye, or Q plots, and are also available in the
MATLAB workspace.
The table shows the following measurements:
X-Eye (Y-Eye) : These are the measurements related to the decision-based
Q-factor method. Sweeping the decision threshold value while computing the
resulting BER, provides a measure of the Eye Height, and standard deviations
of each rail.
X-Const (Y-Const) : These measurements are made on the constellation
groups calculated for the constellation diagram display.
X-Trans (Y-Trans) : The transition parameter measurement is based on the
Transition Average. (See page 48, Waveform averaging .) The values listed
are measured on the averaged transition.
Pow-Trans : Is the transition parameters for power signal. These values are
only calculated for the power signaling types such as OOK and ODB.
XY Measurements : Sig Freq Offset is the calculated difference by between
Signal and Reference Lasers. Signal Baud Rate is the recovered Clock
50 OM4000D Series Coherent Lightwave Signal Analyzer