17
Pulse Widths
As the range of the TDR is adjusted so the duration of the transmitted pulse changes. The pulse width range varies from 2 ns to overcome
signal attenuation and enable the instrument to see further down a length of cable. The greater the range selected on the TDR, the wider
the transmitted pulse.
The accuracy of the “distance to fault” is not affected by the length of the pulse. However, if two or more features exist close together
(excluding open or short circuits), then the second or subsequent feature may be partially masked by the reflection from the first fault.
Hence, for potential multiple features, the instrument should be used with the shortest suitable range, and also the smallest pulse width
selected, that allows both features to be seen.
For output pulse characteristics, refer to output pulse data in the TDR Specification at the end of this guide.
