Monitoring the SDI Physical Layer
To Take Eye Measurements
After you have configured the instrument for Eye measurements, you can use the cursors to take manual waveform
measurements, or you can use the automatic eye measurements function (Option Phy only).
To Set Up for Eye Measurements
1.
Configure the instrument to monitor the
SDI physical layer. (See page 86,
To
Con
fi
gure the Physical Layer Settings
.)
2.
Connect a serial video-signal to the
instrument using a 75
Ω
cable of two
meters or less in length. Use high-quality,
low-loss coaxial cable, such as Belden
1694A.
3.
Press the
MAIN
front-panel button.
4.
Touch the
Eye
soft key to display the
Eye soft key menu.
The procedures on the following pages describe how to take manual measurements of the Eye waveform. If Option Phy is
installed, the instrument can also take automatic eye measurements.
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.
To Manually Measure Eye Amplitude
1.
Perform the initial setup for Eye
measurements. (See page 92,
To Set
Up for Eye Measurements
.)
2.
Touch the
Cursors
soft key. The
instrument displays the cursors
submenu.
3.
Select the
Show Volt
soft key to enable
display of the voltage cursors. Voltage
cursor V1 is selected by default.
92
Quick Start User Manual
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