Manual Psiber CT 50 Cable Tool (page 2 of 12) (English, German, French)

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English

BOX CONTENTS

• CableTool Multifunction Cable Meter • Carrying Case

• User Guide • Four AA Alkaline Batteries

• Two Banana Jack to Alligator Test Leads

• One Banana Jack to BNC Adapter • One BNC to “F” Adapter

BATTERY

The CableTool operates on four AA alkaline bat-

teries. Remove the battery cover at the back of the

unit and insert the batteries with the orientation as

shown. Battery polarity is marked inside the battery

well for reference.

INTRODUCTION

The CableTool Multifunction Cable Meter electrically measures the length of a

cable using Time Domain Reflectometry technology. The CableTool measure-

ment begins by transmitting an electrical pulse into the connected cable. The

electrical pulse travels along the cable until it hits a discontinuity (either a short or

an open) and is then reflected back to the unit. The CableTool precisely measures

the time between launching the pulse and recieving the reflected pulse. The time

measurement is converted to distance using the cable NVP (Nominal Velocity of

Propagation).

Additionally, the CableTool provides a continuous reading of any voltages

present on the cable under test and features four different tone frequencies and

patterns for tracing cables with a tone probe.

MECHANICAL

FEATURES

OPERATION

Attach the test leads to the CableTool by inserting the safety banana plugs into

the banana jacks at the top of the unit. Turn the CableTool on by pressing the “PWR”

button. The startup screen is shown for a few seconds and then the Mode Screen is

displayed. Clip one test lead to each of two conductors of the cable to be tested.

MODE SCREEN

When the Mode Screen is displayed, the CableTool immediately starts meas-

uring voltage and updates the reading several times per second. If more than a

6-8 volts are present on the cable, do not conduct a Length test or apply a Tone

signal until the circuit is de-energized. The CableTool can withstand continuous

input voltages of up to 250Vrms.

LENGTH SCREEN

Pressing the Length function key in the Mode

Screen presents the Length Screen. The Cable-

Tool automatically starts measuring the distance

to the fault (open or short) using the NVP of the

Default Cable (see Default Cable Setup). Using the Up/Down Cursor key, any of the

eight user selected cable types, the four custom cable types or a cable type from the

prestored cable list can be selected and the length is corrected for the correspond-

ing NVP. The length measurement is continuously updated.

When the NVP for a cable is known to be

different than the displayed NVP, the NVP can

be changed by pressing the Select function

key to move the arrow to the NVP field and

then pressing the Up/Down cursor key to modify the NVP. The NVP can also be

modified and stored in Cable List setup.

RECOMMENDATION: Before starting a

job with a new spool or box of cable that has a

known length, make a length measurement with

the CableTool to determine if the prestored NVP

for that cable type provides the correct length. This is done by selecting a cable type

that matches or is similar to the type of cable to be tested, press the Select function

key to move the arrow to the NVP field and press the Up/Down Cursor key until the

displayed length matches the known length printed on the box or spool. The modi-

fied NVP will only be used while making this length measurement, exiting the screen

or turning off the power will reset the NVP to the original value. To store the cable

type with the modified NVP see “Cable List Setup”. The prestored NVP is a typical

value and adjusting the NVP to the actual length will provide more accurate results.

See “Understanding NVP” for more information.

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Psiber CT 50 Cable Tool Manual

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