Single-ended TDR Measurements
Measuring the Distance to a Discontinuity
7-39
Figure 7-25
1 Press the Clear display key. Whenever an external connection is changed,
Clear display should be pressed to reset averaging.
2 Press the
SETUP Marker key.
3 Press the
Mode
softkey and select TDR/TDT.
4 Press the
Reference
softkey to select ref plane.
5 Press the
Marker units . . .
softkey.
6 Press the
Horiz units
softkey to select meter.
Before the distance from the reference plane (the end of the cable) to the
narrow trace can be computed, either the dielectric constant or the velocity of
the transmission line must be known. For the demo board the dielectric
constant is approximately 3.945.
7 Change the
Dielectric c
to 3.945.
8 Press the
Done
softkey.
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