HP 54753A User Manual

Single-ended TDR Measurements
Measuring Transmission Line Percent Reflection
7-27
Figure 7-16
Since the generated TDR step has a risetime of 35 ps, it is impossible to directly
measure the percent reflection to a 500 ps step. One way to measure the percent
reflection of a 500 ps step is by using the waveform math bandwidth limit
function. The bandwidth limit function effectively applies a low pass filter to
the selected waveform.
The following shows how to use the waveform math bandwidth limit function
to measure percent reflection.
1 Change the Scale to 1 ns/div.
2 Press the
SETUP Math key.
3 Press the
Function softkey to select f2.
4 Press the
Define function . . . softkey.
5 Press the
Operand 1 softkey and select channel 1.
6 Press the
Enter softkey.
7 Press the
Operator softkey and select bw limit.
8 Press the
Enter softkey.
9 Change the
Risetime to 500 ps.
10 Press the
Done softkey.
11 Press the
Display softkey to display the f2 function.
12 Press the
SETUP Channel 1/3 key.
Wide Trace
Discontinuity

HP 54753A Specifications

General

Brand	HP
Model	54753A
Category	Control Unit
Language	English