Differential TDR Measurements
Measuring Differential and Common Mode Impedance
8-7
6 Press the
Enter
softkey (Figure 8-2).
Figure 8-2
1 Press the SETUP Channel key for the channel whose reflected step is the
right-most step on the display.
2 Press the
Calibrate . . .
softkey.
3 Change the
TDR Skew
until the remaining ∆Time is approximately 0. You
will need to move the control slowly as it takes a short amount of time
for the waveform to settle.
Deskewing Differential Cables
The next thing that must be done before you can measure differential
impedance is to deskew the TDR step generators to the end of the cables. The
following steps describe the deskewing process.
1 Connect an SMA cable to the TDR plug-in channel 1.
2 Connect an SMA cable to the TDR plug-in channel 2.
3 Press the
SETUP Time base key.
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