18
TS54TDR/TS53 PRO Test Sets
Users Guide
How to Change the Length Units
The TDR shows length measurements in feet or meters.
To change the unit of measurement:
1
Press Q.
2
Press M, press C to put the flashing cursor next
to
TDR, then press M again.
3
Press D to put the flashing cursor next to Units,
then press
M.
4
Press L or R to select feet (ft) or meters (m).
5
To save your selection before you exit or go back
to the main menu, press
M. The display shows
Saved.
To go back to the previous menu, press Q. Or,
press
C or D until Back shows, then press M.
Line Verification
The Line Verification function does tests for data and
voltage on the line when you press t. If the test set
senses data or voltage, it gives these responses:
•
Data Detect LOCK OUT: There is data on the line.
•
If there is voltage on the line, but no dial tone, the
display shows a voltage measurement
•
Active Telephone Line: There is a dial tone on the
line and there is no ANAC number stored in
memory location 9.
•
If there is a dial tone on the line and an ANAC
number in memory location 9, the test set
automatically dials the ANAC number and shows
the telephone number for the line. This helps you
identify the line so that you can make it inactive
before you do the TDR test again. Or, the number
can show you that you are connected to the
wrong line.
If Line Verification is off, and there is data or voltage on
the line, the display shows
TDR Voltage Detect
Lockout
.
To turn on the Line Verification function:
1
Press M.
2
Press C to put the flashing cursor next to TDR,
then press
M.
3
Press D to put the flashing cursor next to Line
Verif, then press M to select Line Verif.
4
Press R or L to select On or Off.
5
To save your selection before you exit or go back
to the main menu, press
M. The display shows
Saved.
To go back to the previous menu, press Q. Or,
press
C or D until Back shows, then press M.
VOP
To get the most accurate measurements of the length
of a cable or the distance to a fault, set the velocity of
propagation to the correct value for the cable.
See"Velocity of Propagation (VOP)" on page 24.
Using the TDR on Multi-Wire Cables
In a multi-wire cable, such as 4 wire telephone cable, 8
wire CAT-5 cable, 12-2 with ground ac wire, or several
THHN wires inside a conduit, a short can exist between
any of the conductors, including a shield or the
conduit. To detect the short, you must connect the test
set to the wires that are shorted. This means that to
fully test a multi-wire cable, you must test every wire
against every other wire including the shields and
conduits.
While a quick way to test many conductors against
conduit or shield length is to connect all the conductors
to one clip lead and the shield to the other lead, this
will reduce the impedance of the cable, and
measurements may fall below the test set’s range. It is
more reliable to test the wires individually.
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