Performance Veri
fi
cation
Test System and Probe Rise Time
14.
Disconnect the SMA cable and BNC adapter from the Channel-1 side of the TekVPI Calibration
fi
xture. (See Figure 13.)
15.
Connect the SMA cable from Channel 1 of the sampling oscilloscope to the SMA connector on the Probe Calibration
Fixture. Leave the 50
Ω
termination on the other SMA connector.
16.
Plug the probe into the TekVPI Calibration
fi
xture.
17.
Probe the DM pins on the Probe Calibration Fixture. A probe positioner may be helpful. (See Figure 7 on page 13.)
18.
Set the TekVPI oscilloscope offset to 0.0 V.
Figure 13: Probe rise time setup
NOTE.
The following measurements are taken with the sampling oscilloscope. The TekVPI oscilloscope only provides
power and offset to the probe.
19.
On the sampling oscilloscope, expand the horizontal scale to locate the step edge: set the vertical scale to 10 mV/div,
and adjust horizontal range to 200 ps/div while maintaining the edge view. For a more stable measurement display,
turn on averaging.
20.
Adjust the position controls on the sampling oscilloscope to display the entire leading edge waveform.
21.
Use the measurement capability of the sampling oscilloscope 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+p
.
20
TDP3500 Technical Reference
Summary of Contents for TDP3500
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