Triplett TDR - Manual (Page 12)

Page 11
11. Checking networks (thin wire ethernet)
While carrying out the following tests, equipment should NOT be connected
to the network.
Set TDR with network cable type ie. E/net 9907, remove 50Ω terminators
from both ends of network.
Connect TDR in place of one of the terminators.
Press
Length of network will be displayed as:
Repeat measurement from other end of network
The length shown should be the same from either end and indicate the total
length of the network. If the lengths differ and are less than the expected,
this is probably due to an open circuit in the network at the distance shown
If displays of:
are shown this indicates a short circuit in the network at the distance shown
Disconnect TDR and refit terminators.
Length
XX.Xft
Short
XX.Xft