Megger 655535 Operating Manual

CFL535F and CFL535P Cable Fault Locator

User Guide

SAFETY WARNINGS

• This instrument meets the safety requirements of IEC 61010 part 1 to 300V CAT III.

• Although this tester does not generate any hazardous voltages, circuits to which it can be connected could be dangerous due to electric shock hazard or due to arcing (initiated by short circuit). While every effort has been made by the manufacturer to reduce the hazard, the user must assume responsibility for ensuring his or her own safety.

• For use on energised systems rated up to 300V Installation Category III* use the fused clip set Part

Part Number 2000-151, must be used. * Relates to the transient over voltages likely to be met in fixed wiring installations. CAUTION (Risk of electric shock) 4mm plug to BNC

Adaptor:

• This 4mm plug to BNC adapter is intended for use with telecomm network cables only, it is not designed or intended for direct connection to an energised mains supply. However, in normal use it may be subject to telecom network voltages (TNV) as defined by IEC 60950 3rdedition (1999-04).

• The BNC plug and socket are, by necessity, accessible. The outer sheath for this connector is normally at SELV levels, however under single fault conditions it may carry hazardous voltages. The operator must therefore verify that the accessible plug or socket is at SELV levels prior to touching, or alternatively wear appropriate insulated gloves.

• The instrument should not be used if any part of it is damaged.

• Test leads and crocodile clips must be in good order, clean and with no broken or cracked insulation.

• Check that all lead connections are correct before making a test.

• A Fused Lead Set must be used to connect to energised live systems. Refer to the accessories section for options.

• Disconnect the test leads before accessing the battery compartment.

• Refer to operating instructions for further explanation and precautions.

• Safety Warnings and Precautions must be read and understood before the instrument is used. They must be observed during use.

NOTE

THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS.

Contents

Safety Warnings 2

Introduction 4

User Display & Control guide 5

Display detail Controls

Operation 9

Battery Fitting and Replacement

Saving a trace to memory Recalling a trace from memory Downloading a trace to a PC Uploading stored trace from PC to CFL

Techniques for Improving Accuracy 14

Test the cable from both ends

Care and Maintenance 15 Specification 15

Accessories 17

Initial Power Up 9

Power-up and initial configuration

Using the CFFL535 10

Line Feed Connection to cable under test Measuring distance to fault

Instrument Features 12

TxNull Velocity Factor Pulse Widths Trace Storage

Repair and warranty 18

Symbols used on the instrument are:

Caution: Refer to accompanying notes.

Equipment protected throughout by double or reinforced insulation.

Instrument flash tested to 3.7kV rms.

Equipment complies with current EU directives.

Introduction

Thank you for purchasing the CFL535 cable fault locator. Before attempting to use your new instrument please take the time to read this user guide, this will save you time, advise you of any safety precautions you need to take and prevent damage to yourself and the instrument.

The CFL535 is an advanced instrument capable of identifying a wide range of cable faults. The instrument uses a technique called Pulse Echo (also known as Time Domain Reflectometry or TDR). A pulse is transmitted into a cable from one end. Any changes in cable impedance will cause a proportion of the pulse to be reflected. These reflections are displayed as a trace on the instrument.

The CFL535 can be used on any cable consisting of at least two insulated metallic elements, one of which may be the armouring or screen of the cable.

Dual inputs and large graphic display allow a wide range of comparative tests to be performed between cable pairs and/or stored results.

The instrument has 15 memories, enabling test results to be displayed and compared with “live or real time” results.

The download feature allows transfer of waveform data to and from a computer, using the TraceMaster software, for analysis and storage for future reference.

User Controls and Display

The display and controls of the CFL535 have been ergonomically arranged so that the instrument is easy to use. The displayed information consists of the following:

5 9

(1) Selected channels (2) Magnification or Zoom bar (3) Range (4) Reflected pulse (5) Low battery indication (6) Gain setting (7) Cursor (Distance) bar (8) Distance to cursor (9) Velocity Factor (10) Transmitted pulse

The Instrument controls consist of the following.

L1 Input channel 1 L2 Input channel 2. * Only test leads supplied with the instrument should be used.

Contrast: Display contrast adjustment allows the user to adjust the contrast of the LCD Display for optimum viewing comfort.

Tx Null: Allows the user to reduce the amplitude of the transmitted pulse on the displayed trace, allowing reflections close to the start of the cable (normally referred to as the “Dead Zone” to be identified. Refer to the section on Tx Null for further details.

1 Cursor left: Moves cursor left, on the display. Auto repeats if held down.

SHIFT/Cursor left – Dual cursor mode: Press with the SHIFT

key to select alternative cursor in dual cursor mode. Press the SHIFT and Cursor key again to swap active cursors.

2 The Find key searches for the furthest major change of

impedance. This may be a fault or the end of the cable if this is a short or open circuit hazardous voltage is present.

3 Cursor Right: Move cursor right, on the display. Auto repeats if held down.

SHIFT/Cursor right – Dual cursor mode: Press with the SHIFT key to select alternative cursor in dual cursor mode. Press the SHIFT and Cursor key again to swap active cursors.

4 Velocity factor: A bi-directional key for setting of the cable

velocity factor in the range 0.300 to 0.999 of the speed of light. Auto repeats if held down. Refer to the section on ‘Velocity factor’ for further information.

5 L1-L2 Mode: Selects the test mode by cycling between L1,

L2, L1 & L2, and XTALK. The selected mode is shown in the top left of the display screen.

SHIFT/Mode – Difference measurement: (L1-L2 or L1-M1, 2…15) To display the difference between two channels the TDR must be in either L1&L2 or L1&M#) modes. Press the MODE key with the SHIFT key depressed. The instrument will display L1-L2, or L1-M1.

The modes are shown as ‘normal’ and ‘zoom’ at the top of the display window.

SHIFT/Zoom – Intermittent mode: By pressing the ZOOM key with the SHIFT button held down, the instrument switches to ‘Intermittent mode’. While in this mode the CFL will accumulate any transient reflections as a permanently displayed trace. To exit the Intermittent mode press the ZOOM key with the SHIFT button down, or by change the range, gain or mode settings.

7 Help Key: These screens provide help on the use of the

CFL535F. Press the help key followed by the function key on which you require help.

8 Backlight key: Toggles back light on or off. Backlight

automatically switches off after 1, 2 or 5 minutes (as set in the configuration menu.

9 Gain: A bi-directional key allowing adjustment of the

instrument gain from 0dB to 90dB in steps of 6dB. Auto repeats if held down. Refer to the Operation section for further details.

10 Shift: Used in combination with other keys to access

alternative modes.

6 Zoom: The ZOOM key toggles the display between the

whole display range and a zoomed in view. This allows more accurate positioning of the cursor bar and hence the distance measured.

11 Range: A bi-directional key which adjusts the instruments

measurement range from 16km (48kft) down to 50m (150ft). Auto repeats if held down. A full range of details can be found in the product specification.

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