Klein-tools VDV501-823 User Manual download pdf (Page 5)

ENGLISH

Testing Continuity

Testing Continuity-Installed

Testing Continuity-Term Coax

Testing Continuity- Installed Coax

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VDV SCOUT

PRO 2 OWNERS: PLEASE SKIP TO PAGE 7.

VDV SCOUT

PRO 2 LT KEYPAD

VDV SCOUT

PRO 2 LT – MEASURING LENGTH OVERVIEW

The VDV Scout

Pro 2 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.

VDV SCOUT

PRO 2 LT – LENGTH CONSTANT

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 2 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 the 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

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 ft. long. This will yield a ±2% uncertainty (1

in 50) of length constant accuracy. A longer cable reduces this uncertainty.

VDV SCOUT

PRO 2 LT – MEASURING LENGTH

F. Voice/Up Arrow:

In Length Measurement mode, press and

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

2 LT will test for length on the first pair with no faults found. In

Length Constant Edit mode, this button will increase the length

constant by 0.1pF. Hold down to scroll through values quickly.

G. Video/Down Arrow:

In Length Measurement mode, press

and release to measure length of a cable connected to the

F-connector port. In Length Constant Edit mode, this button

will decrease the length constant by 0.1pF. Hold down to scroll

through values quickly.

H. Data:

In Length Measurement mode, press and release to measure length of a cable connected to the RJ45 port. Press and

release again to change which pair of wires length is being measured on. By default, the VDV Scout

Pro 2 LT will test for

length on the first pair with no faults found.

I. Tone/Length Measurement:

While the tester is off, press and hold for three seconds to enter Tone mode (see general Keypad

section). While the tester is off, press and release to enter Length Measurement mode. In Length Measurement mode, press

and release again to briefly show the length constant. Press and hold for three seconds to enter Length Constant Edit mode.

Press and release the button one more time to exit Length Constant Edit mode.

F G H

Connect one end of the cable under test to the RJ45 port

(if you are testing an

Ethernet cable) or RJ12 port (if you are testing a 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.

Press the length button

to enter length mode.

Press the data button

or the phone button

or the video button

the keypad to begin the test on the Ethernet cable or phone cable or coax cable,

respectively.

(Optional) press

repeatedly to select the pair of wires

that should be

measured. The first pair that is functional is chosen by default.

Read the length measurement

as shown.

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 ft. greater than the actual measurement. In this case, subtract 1 or 2 ft. from

the reading to obtain the actual measurement. Coax cable under test must be left.

unterminated. Coax ID remotes cannot be used.

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Klein-tools VDV501-823 User Manual Page 5

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