HP 54753A User Manual page 157

Figure 8-4
Establishing the Reference Plane
Since we want to measure the impedance of a differential line, we must establish
the reference plane so the scope can measure the height of the TDR step height.
Press the
1
2 Press the
3 Connect an SMA short to the end of the cable on channel 1.
Press the
4
5 Remove the SMA short from the end of the cable and connect an SMA
50 ohm load to the end of the cable.
6 Press the
Remove the SMA 50 load from the end of the cable.
7
8 Connect an SMA short to the end of the cable on channel 2.
9 Press the
Remove the SMA short from the end of the cable and connect an SMA
10
50 ohm load to the end of the cable.
11 Press the
12 Remove the SMA 50 load from the end of the cable.
Measuring Differential and Common Mode Impedance
key.
TDR/TDT Setup
Establish ref plane softkey.
softkey.
Continue
Continue softkey.
Continue softkey.
Continue softkey.
Differential TDR Measurements
8-9