Single-ended TDR Measurements
Measuring Transmission Line Percent Reflection
7-28
13 Press the
Display
softkey to turn off channel 1 display.
Figure 7-17
The green waveform is function 2 which is the 500 ps filtered waveform of
channel 1. Because 500 ps is much greater than 35 ps, the overall system
risetime is approximately 500 ps.
We will now calculate the peak percent reflection using the measured voltage
and the following formula:
This method does not require establishing normalization or the reference plane
which is useful for quick measurements or when establishing normalization and
the reference plane is difficult to do.
1 Press the SETUP Marker key.
2 Press the
Mode
softkey and select TDR/TDT.
3 Press the
Enter
softkey.
4 Press the
+ Source
softkey and select function 2.
5 Press the
Enter
softkey.
6 Press the
Reference
softkey to select ref plane.
7 Press the
Marker units . . .
softkey.
p
max
100
v 200 mV–
200 mV
----------------------------
×=
To Next Page
Loading...
