HP 54753A User Manual page 161

Figure 8-8
Switch connection
Response 1
Waveform
Differential
Impedance
1 Press the
2 Press the
3 Press the
4 Press the
5 Press the
6 Change the
As the + marker moves along the waveform, the differential impedance at the
current + marker is shown at the bottom of the display. If you move the + marker
to the portion of the waveform representing the cable response, the impedance
is the sum of the two cable impedances (approximately 100 ohms depending
on the quality of the cable). The negative bump where the + marker is located
in Figure 8-8 is the parasitic capacitance due to the leg of the switch connected
to the trace.
Measuring Differential and Common Mode Impedance
SETUP Marker key.
Mode softkey and select
softkey.
Enter
+ Source softkey and select
Enter softkey.
until the + marker is on screen.
+ Position
Differential TDR Measurements
.
TDR/TDT
.
response 1
8-13