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Measurement Results.
9 Click De-skew. The Start and Stop waveform
markers will probably be located on the incident
(first) step response as shown here.
10 Increase the horizontal time span to view both
incident and reflected step responses. The
reflected response is from the end of the cables.
11 Position the reflected response near the display's
left edge, then decrease the horizontal span while
keeping the reflected response displayed. Repeat
until the span is approximately 50 ps/div.
When you move the incident step response off the display's
N O T E
left edge, the markers automatically move right to the reflected step
response as shown above.
12 In the Measure table, locate the mean delta time
value. Identify the channel having the longest
path. In the Differential TDR Skew dialog box's
Horizontal Skew setting for the longest channel,
enter half the mean delta time value.
13 Next, adjust the TDR Skew setting to eliminate
skew between the channels. Close the dialog box.
12
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