Tektronix WFM2200A, User Manual

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To manually measure rise
time using variable gain
1. Perform the initial setup for eye measurements. See Eye measurement set up
on page 191.
2. Press and hold the GAIN button to view the Gain pop-up menu and select
Enable for VAR Gain . Press the GAIN button again to dismiss the pop-up
menu.
3. Use the General knob to resize the waveform to 10 major divisions. Position
the top and bottom of the waveform on graticule lines.
4. Press the CURSOR button to display the measurement cursors.
5. Position the first timing cursor at the crossing of the rising edge of the eye
waveform and the graticule line two divisions above the bottom of the
waveform. (See the following image.)
6. Position the second time cursor at the crossing of the rising edge of the eye
waveform and the graticule line two divisions below the top of the waveform.
(See the following image.)
7. Note the 20 – 80% rise time measurement displayed in the Delta time
readout. (See the following image.)
Figure 57: Measuring rise time using variable gain in the Eye display
Monitoring the SDI physical layer (WFM2300 only)
WFM2300 and WFM2200A Waveform Monitors User Manual 193