Klein Tools VDV Scout Pro Mode D'emploi page 4

ENGLISH
F
I
H. Data: In Length Measurement mode,
release again to change which pair of wires length is being measured on. By default, the VDV Scout™ Pro LT will test for length
on the fi rst pair with no faults found.
I. Tone/Length Measurement:
section). While the tester is off, press and release to enter
and release again to briefl y show the length constant. Press and hold for three seconds to enter
Press and release the button one more time to exit
The VDV Scout Pro LT uses the capacitive properties of a cable to measure its length. One end of the cable should be connected to the
corresponding port on the top of the tester. The other end should be left disconnected or attached to the self-storing remote.
The Length Constant sections below discuss the best practices to follow when measuring length in order to achieve the most accurate
results.
ax
The length constant refers to the electrical characteristic of a cable used to characterize length. Every cable has an associated length
constant in units of picofarads per foot. Setting the length constant on the tester is important to obtaining an accurate measurement
from the VDV Scout™ Pro LT. The default length constants are as follows.
• Voice: 17pF/ft
• Data: 15pF/ft
• Video: 15pF/ft
The length constant can sometimes be provided by the manufacturer of he cable (see EDITING LENGTH CONSTANT section). You may
have to determine the length constant yourself (see DETERMINING LENGTH CONSTANT section). Length constants can range from
10pF/ft to 40pF/ft.
Measurement accuracy is dependent on how close the tester can be set to the length constant of the cable being measured and the
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consistency of the cable along its length.
The length constant can vary from cable to cable, even of the same type produced by the same manufacturer. It can also vary over
the length of one cable because the length constant is dependent on the physical properties of the cable, which may not be consistent
throughout the entire cable. The change in wire pair spacing through the cable can vary the length constant along the length of the cable.
When setting the length constant using a length of cable, the cable should be at least 50 feet long. This will yield a ±2% uncertainty
(1 in 50) of length constant accuracy. A longer cable reduces this uncertainty.
3
1. Connect one end of the cable under test
phone cable) or F-connector port (if you are testing a coax cable) located at the top of the main tester body. Leave the other end
of the cable unterminated.
2. Press the length button
3. Press the data button
or phone cable or coax cable, respectively.
4. (Optional) press
chosen by default.
5. Read the length measurement
Note: A phone or data cable under test can be unterminated (open) or terminated by an RJ45 ID remote. If it is terminated by the
self-storing remote, the reading will be 1 or 2 feet greater than the actual measurement. In this case, subtract 1 or 2 feet from the
reading to obtain the actual measurement. Coax cable under test must be left unterminated. Coax ID remotes cannot be used.
VDV Scout VDV Scout Pro Owners: please skip to page 6. VDV Scout Pro Owners: please skip to page 6.
™ ™ ™ ™
G H
ID
press and release to measure length of a cable connected to the RJ45 port. Press and
While the tester is off, press and hold for three seconds to enter Tone mode (see general Keypad
[LT] MEASURING LENGTH - OVERVIEW
[LT] ABOUT THE LENGTH CONSTANT
[LT] MEASURING LENGTH
to the RJ45 port (if you are testing an ethernet cable) or RJ12 port (if you are testing a
I to enter length mode.
H
or the phone button
H F
or repeatedly to select the pair of wires that should be measured. The fi rst pair that is functional is
as shown.
[LT] KEYPAD
F. Voice/Up Arrow: In Length Measurement
1
release to measure length of a cable connected to the RJ11/12
port. Press and release again to change which pair of wires length
is being measured on. By default, the VDV Scout™ Pro LT will
test for length on the fi rst pair with no faults found.
Constant Edit mode,
by 0.1pF. Hold down to scroll through values quickly.
1
G. Video/Down Arrow: In Length Measurement
release to measure length of a cable connected to the F-connector
port. In Length Constant Edit
length constant by 0.1pF. Hold down to scroll through
values quickly.
Length Measurement mode. In Length Measurement mode,
Length Constant Edit mode.
F G on the keypad to begin the test on the ethernet cable
or the video button
4
mode, press and
2 3
this button will increase the length constant
mode, press and
mode, this button will decrease the
Length Constant Edit mode.
In Length
press