HP 54753A User Manual page 137

8 Press the
9 Press the
10 Change the
wide trace discontinuity.
11 Read the Y voltage value at the bottom of the display.
Figure 7-18
Wide Trace
Voltage
The measured voltage (v) is 155.20 mV. Substituting into the equation:
We will now have the oscilloscope make this measurement for us. This requires
establishing normalization and the reference plane as follows.
1 Press the
2 Press the
Press the
3
4 Press the
5 Press the
Remove the cable end connected to the demo board.
6
7 Press the
Measuring Transmission Line Percent Reflection
softkey to select
Vertical units
Done softkey.
+ Position until the + marker is over the negative peak of the
155.20 200 –
×
p = 100 ------------------------------ -
max
200
+ Source softkey and select
softkey.
Enter
key.
SETUP Math
Display softkey to turn the function 2 display off.
key.
TDR/TDT Setup
Normalize response . . .
Single-ended TDR Measurements
.
Volt
= – 22.40 %
.
response 1
softkey.
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