Performance Veri
fi
cation
7.
Set the Channel 1 sampling head to TDR mode: press the
SETUP DIALOGS
button and select the TDR tab. (See
Figure 12 on page 19.)
8.
Set the Channel 1 (
C1
)
Polarity
to positive (rising).
9.
Set the
Preset
of Channel 1 on. TDR Preset sets Internal Clock in the Trigger menu, turns on the TDR Step in the
TDR Setups menu, turns on the channel and selects the acquisition Units in the TDR Setups menu, and sets the
horizontal scale, position, and reference. The sampling module will turn on a red light next to the SELECT channel
button, indicating that TDR is activated for that channel.
Figure 12: TDR parameter setup
10.
Turn off the display for Channel 1 so that only Channel 8 is shown on screen.
11.
Adjust the oscilloscope horizontal and vertical position controls to display a signal similar to that shown. (See Figure 11.)
12.
Set the oscilloscope horizontal scale to 50 ps/div and center the waveform.
13.
Use the oscilloscope measurement capability to display rise time. Increase the stability of the pulse edge measurement
by using averaging, if available. Rise time is determined from the 10% and 90% amplitude points on the waveform.
Record the rise time as
t
s
.
TDP3500 Technical Reference
19
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