N1021B Probe Kit
User’s Guide
11
Performing an Operation Verification
There are no warranted product specifications to measure product performance against.
Use this TDR measurement to confirm if the probe is operational. For additional information
on TDR measurements, refer to the 86100D online help.
1
Calibrate the probe as described in
2
Connect the TDR probe to the cables.
3
Adjust the probe spacing wheel to move the two probe tips together so that they touch
creating a short.
4
Move the response of the probe’s tip to the screen’s left side while reducing the horizontal
span. This action ensures that the response remains displayed. Repeat until the span
setting is 50 ps/div as shown along the display’s bottom edge.
5
Center the response.
6
Adjust the amplitude position and scale of the response as needed.
7
Select the Measure toolbar and click Fall Time. Click Setup > Averaging and enter 16 for the
Number of Averages. Close the dialog box.
8
Using the following equation, calculate the BW of the probe. This simplified equation
estimates one-way bandwidth, based on the measured fall time in seconds. This is a
conservative estimate for bandwidth, because it includes neither the fall time of the
calibrated module nor the cables.
BW
probe
0.2379 2
T
fall time
------------------------
=
NOTE
If the 86100D has Option 202 Enhanced Impedance and S-Parameter software installed, you can view
the SDD11 results for a measurement of the two-way bandwidth.