Configuring Time Domain Reflectometry

Create a time domain reflectometry (.digitdr) document to save a TDR configuration for your project. TDR measures latency introduced by your set-up, and applies the measured values to the channels you select to ensure accurate measurements.

The TDR document groups pins by channel, rather than by site, enabling faster test configuration across sites that share pins.

1. Select File»New»TDR Configuration.
2. Expand Comments to add information about the TDR test configuration.
3. Check the boxes next to each channel you want to include in the TDR measurement.
4. Depending on your goals, use the following table to determine which actions to take once you set up your TDR measurement document.

   Goal	Button
   Apply TDR offset to the specified channel.	Apply TDR
   Execute a TDR test on shorted channels. Note   Only select this option if the selected channels are shorted.	Run TDR to Short
   Execute a TDR measurement on open channels.	Run TDR to Open
   Update the TDR document to display channels from the active pin map.	Update from Pin Map

5. To remove channels no longer present in the active pin map, right-click the TDR configuration table and select Remove Unmapped TDR Entries.