Velocity Of Propagation (Vop); Applications - Fluke TS 100 PRO User Manual

TS100 PRO Cable Fault Finder
Users Guide
To exit the setup mode:
Turn off the tester, then turn it on again.
To reset all parameters to factory default values:
Turn off the tester, hold down both
turn on the tester, then wait at least 10 seconds before
you release and buttons.
Y Z
Turn the tester off, then turn it on again.

Velocity of Propagation (VOP)

VOP is a cable specification that specifies the speed at
which a signal travels down the cable. A VOP of 66
means the signal travels at 66 % of the speed of light.
The tester uses VOP to calculate cable length. See
"Time Domain Reflectometry (TDR) Technology" on
page 14 for details.
Here are some important points about VOP:

Different cables have different VOP values.

The tester's default VOP setting of 66 is suitable for
most applications.

Using the VOP specified for a cable ensures the
most accuracy in fault location, length
measurements, and inventory management. Table
2 and Table 3 show VOP values for common cables.
Some common VOP values are also listed on the
tester's battery door.
You can set the tester's VOP to a known value (see
"Setup Mode" on page 9), or you can use the tester to
determine the VOP for a known length of cable.
To set the VOP to a known value:
1 Turn the tester on while holding down
this mode, the display shows the VOP setting, then
it shows the calculated cable length if a cable is
connected.
10
and buttons,
Y Z
or . In
Y Z
2 When the VOP setting shows, press
change setting. The tester automatically saves the
setting.
3 To exit the VOP adjustment mode, turn off the
tester.
To determine the VOP of a known length of cable:
1 Connect a known length of cable to the tester. The
cable must be 200 feet (60 meters) or longer (such
as an unopened box of cable).
2 Turn the tester on while holding down
this mode, the display alternately shows the VOP
setting and the measured length of the cable.
3 While the length measurement shows, press
to adjust the length to the known length of the
Z
cable.
4 To exit the VOP adjustment mode, turn off the
tester.
While the tester is in VOP adjustment mode,
tone is not injected into the cable.
The tester keeps the VOP setting in flash
memory when you change the batteries

Applications

See Figure 4.
The tester locates opens, short circuits, and crosses in
any two metallic conductors (twisted, untwisted, coax,
copper, aluminum, and steel). It also detects bridge taps
on copper twisted pairs and shows the location and
length of the tap.
or
Y Z
or
Y Z
Notes
to
. In
or
Y