Differential TDR Measurements
Measuring Differential and Common Mode Impedance
8-6
4 Press the
Stimulus
softkey and select differential.
5 Press the
Enter
softkey.
6 Press the
Preset TDR/TDT
softkey.
7 Press the
SETUP Acquisition menu key below the display.
8 Change the
# of averages
from 16 to 4.
These steps set the oscilloscope to a known condition and activate the TDR
steps on channel 1 and channel 2. You should see a display similar to Figure 8-1.
Figure 8-1
1 Press the SETUP Time base key.
2 Change the
Scale
to 100 ps/div.
3 Change the
Position
until the incident edge is off screen to the left.
4 Press the
blue key followed by the milli key to turn on the
∆
Time
measurement.
5 Press the
Stop src
softkey and select channel 2.
Channel skew is set to 0.0 s for both channels. It is important to set these controls
to 0.0 s before adjusting the TDR skew otherwise the TDR step generator skew will
be incorrectly set.
Incident
Steps
Reflected
Steps
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