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Megger TDR900 User Manual

Megger TDR900
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T
ime Domain Reflectometer
Megger TDR900
USER’S
MANUAL
© Copyright 2003 Fine Instruments Corp. All right reserved.
Specifications subject to change without notice.
Litho in Korea.
www.netzerotools.com
www.netzerotools.com
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Megger TDR900 Specifications

General IconGeneral
Output Impedance50 Ω
Weight2.2 lbs (1 kg)
DisplayLCD
Display Resolution0.01 m
Battery LifeUp to 8 hours
Operating Temperature-10 °C to 50 °C
Storage Temperature-20 °C to 60 °C
Resolution0.01 m

Summary

Safety Information

Safety Warnings

Critical safety precautions for operating the meter, including warnings about mains voltage and static discharge.

International Symbols and Standards

Explanation of international symbols used on the meter and a list of relevant safety and EMC compliance standards.

The TDR Cable Length Meter

Meter Capabilities Overview

Introduces the meter's functions for measuring cable lengths and detecting opens or shorts using TDR.

Controls, Indicators, and Buttons Overview

Display and Indicators

Details the LCD display, including initial states, segments, and symbols for status indication.

Connectors and Buttons

Explains the BNC connector and the function of power, backlight, memory, tone, and test buttons.

Meter Operation

Principles of Operation

Explains the time-domain reflectometry (TDR) method and how cable length is calculated.

Connecting the Cable

Guides on how to properly connect different cable types (coaxial, shielded, twisted pair) to the meter.

Setting Cable Type

Steps to select the correct cable type from the library for accurate measurements.

Cable Library (39 Standard Types)

Lists and describes 39 standard cable types stored in the meter's library for quick selection.

Testing Non-Library Cables

Procedure for testing cables not found in the built-in library by manually setting V.O.P.

Determining Unknown V.O.P

How to calibrate the meter to determine the Velocity of Propagation (V.O.P) for unknown cables.

Expanding Cable Library (Custom)

Instructions to store custom cable types and their V.O.P values in the meter's nonvolatile memory.

Measuring Cable Length

Step-by-step guide to measure the length of a cable accurately using the meter.

Checking Networks (Thin Ethernet)

Procedure for testing Thin Ethernet network cable lengths by measuring from both ends.

Changing Measurement Scale (English/Metric)

Switching Measurement Units

How to switch the meter's display between English (ft, in) and Metric (m, cm) measurement scales.

Measurement Accuracy

Accuracy Specifications

Details the expected accuracy for different cable types and lengths, including notes on V.O.P effects.

Theoretical and Actual V.O.P

Understanding V.O.P Variations

Explains factors influencing theoretical vs. actual Velocity of Propagation, such as dielectric and twist pitch.

Special Features

Low Battery and Overrange Indication

How the meter indicates low battery status and overrange or connection errors.

Auto-Power-Off and Tone Generator

Features for managing auto-power-off settings and using the tone generator for cable tracing.

Line Voltage Detection

How the meter detects line voltage on the cable and stops operation if it exceeds a safe limit.

Maintenance

Battery Replacement

Step-by-step guide for replacing the meter's 1.5 volt alkaline batteries.

Specifications

Technical Specifications

Comprehensive list of technical parameters including range, resolution, impedance, and dimensions.

Repair and Warranty Information

Details on servicing, user-serviceability, and the 1-year warranty period for the meter.

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