Monitoring the SDI Physical Layer
12.
The cursor Delta time readout displays
the 20 - 80% rise time measurement.
To Take Automatic Eye Measurements (Option Phy Only)
The following procedure describes how to take automatic measurements of the Eye waveform when Option Phy is installed.
1.
Perform the initial setup for Eye
measurements. (See page 92,
To Set
Up for Eye Measurements
.)
2.
Display the Eye measurement in
full-screen mode.
NOTE.
Eye measurements are shown on
the Eye and Jitter displays only in full-screen
mode. However, the measurements are
displayed on the SDI Status display.
3.
Touch the
Settings
soft key to display
the Settings submenu.
4.
Touch the
Show Measure
soft key. The
measurements are displayed on the left
side of the screen.
NOTE.
If you use the measurement cursors
to measure the eye waveform, you may
measure a different result than that shown in
the automatic eye measurements readout.
This is because the automatic amplitude
measurement uses histograms in order to be
minimally affected by overshoot, ringing and
noise on the signal.
Similarly, the automatic rise time and fall time
measurements use histograms to
fi
nd the
centers of the distributions of 20% and 80%
crossings. The difference between manual
and automatic measurements is usually
insigni
fi
cant for clean, symmetrical signals.
96
Quick Start User Manual
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