TDR/TDT Measurement

To better understanding how to use the TDR option, this section describes the basic TDR/TDT measurement procedure using the VNA.

Operation procedure

1. Connect cables to all test ports.

2. Click the Setup tab.

3. Click the Setup Wizard (under Basic).

4. Set the measurement condition using the Setup Wizard:

   1. Select Deskew & Loss Compensation (under Error Correction) then click Next >.

   2. Click the Differential 2-Port button, then click Next >.

   3. Click the Deskew button, then click Next >.

   4. Connect a Thru between Port 1 and Port 3. Click the Measure button, and click Next >.

   5. Connect a Thru between Port 2 and Port 4. Click the Measure button, and click Next >.

   6. Connect a Load to Port 1 and click the Port 1 button to measure the Load. Repeat this step for Port 2, Port 3 and Port 4. When finished, click Apply to save the measurement.

   7. Click Next >.

   8. Connect the DUT to cables. Click the Measure button, then click Next >.

1. 8. Set the Rise Time to "35 ps" and select "10-90%" from the Definition drop-down list. When finish, click Apply to save the settings.

   9. Click the Finish button.

5. Click the Auto Scale then All Traces from the drop-down list.
6. Select Trace 3.
7. Click the Marker Search button.
8. Select Rise Time (10-90%) from the drop-down list.

Expected result

Trace 1 shows the TDR measurement in terms of impedance and Trace 3 shows TDT measurement in terms of voltage. The rise time of Trace 3 will be shown.

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