Operation Manual

Page 17 of 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.