HP 54753A User Manual page 166

4
Figure 8-12
Measured Skew
1
2
3
4
Differential TDR Measurements
Making Differential TDT Measurements
Change the until the reflected edge is approximately centered
Position
in the display (Figure 8-12).
A ∆time (skew) value of 7 ps (one fifth the TDR step risetime of 35 ps) or less
is small enough that the skew will not introduce errors into TDR measurements.
However, for the purposes of demonstration, the following process shows how
to deskew the cables.
Press the SETUP Channe
right-most step on the display.
Press the Calibrate . . .
Change the until the
Skew
Change the TDR Skew
will need to move the control slowly as it takes a short amount of time
for the waveform to settle (Figure 8-13).
8-18
l key for the channel whose reflected step is the
softkey.
∆
Time is ½ its initial value.
∆
until the remaining Time is approximately 0. You