Tektronix WFM2200A, Руководство пользователя

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NOTE.
Signal-source amplitudes outside ±10% of 800 mV can degrade receiver
performance.
To manually measure
aberrations
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 peak of the overshoot at the top horizontal
part of the waveform. (See the following image.)
4. Position the second voltage cursor at the bottom of the top line of the
waveform. Include any ringing (the oscillation following overshoot) in the
measurement. Essentially, you are measuring the thickness of the top line of
the waveform. (See the following image.)
5. Note the amplitude of the aberration displayed in the Voltage Cursor readout.
(See the following image.)
6. Perform the same voltage-cursor measurement on the bottom line thickness,
including any undershoot and ringing.
Figure 56: Using cursors to measure aberrations in the eye pattern
NOTE.
Aberrations at the top or bottom line of the waveform should not exceed
10% of the signal amplitude. Automatic equalizer circuits in receivers may be
sensitive to larger aberrations.
Monitoring the SDI physical layer (WFM2300 only)
192 WFM2300 and WFM2200A Waveform Monitors User Manual