R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
4.4 Eye Opening Calculation
4-9
4.4
Eye Opening Calculation
The instrument calculates eye opening ratios as described below.
When the maximum and minimum amplitudes retrieved by the X cursor in the measurement window are rep-
resented as A and B, respectively, the following expression is used:
Eye opening ratio (for amplitude) = 2B / (A + B)
×
100 (%)
When the maximum and minimum time intervals retrieved by the Y cursor are represented as A’ and B’, re-
spectively, the following expression is used:
Eye opening ratio (for time) = 2B’ / (A’ + B’)
×
100 %
4.4.1
Calculation Using No Measurement Window
When performing the eye opening measurement without displaying the measurement window, the maxi-
mum and minimum amplitudes A and B are calculated from the waveform data located by the X cursor as
shown in Figure 4-8 and the opening ratio is calculated from A and B.
The maximum and minimum time periods A’ and B’ are calculated from the waveform data located by the
Y cursor on the screen.
Figure 4-8 Eye Opening Ratio Calculation (Using No Measurement Window)
X cursor
A and B are calculated from the
waveform data located by the X cursor.
Y cursor
A’ and B’ are calculated from
the waveform data located
by the Y cursor.
