Tektronix WFM2200A, Руководство пользователя

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Eye measurement set up
1. Configure your instrument to monitor the SDI physical layer. See
Configuring physical layer settings on page 188.
2. Connect a serial video-signal to your 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. Select a tile and press the PHY button and select Eye Display from the
Display Type submenu.
4. Press the GAIN button to display the gain menu, select VAR Gain , and turn
the GENERAL knob until the vertical gain is x1.00.
To make manual eye
measurements
NOTE.
Use the button to change the sweep of the Eye display.
1. Perform the initial setup for eye measurements. See Eye measurement set up
on page 191.
2. Press the CURSOR button to display the measurement cursors.
3. Position one voltage cursor at the top part of the waveform, ignoring any
overshoot or undershoot on the rising or falling edges. (See the following
image.)
4. Position one voltage cursor at the bottom part of the waveform, ignoring any
overshoot or undershoot on the rising or falling edges. (See the following
image.)
5. Note the amplitude of the eye waveform that is displayed in the Voltage
Cursor readout. (See the following image.)
Figure 55: Eye measurement cursor placement
Monitoring the SDI physical layer (WFM2300 only)
WFM2300 and WFM2200A Waveform Monitors User Manual 191