Brief Time Domain Reflectivity (TDR) Theory

A Time-Domain Reflectometers (TDR's) such as the Megger CFL800E, CFL510F, CFL535F, TDR2000/2, TDR500 and TDR900 are an electronic instrument used to characterize and locate faults in metallic cables, e.g., twisted wire pairs, coaxial cables). The equivalent device for optical fiber cables is an Optical Time-Domain Reflectometer (OTDR). A TDR transmits a short duration fast rise time pulse along the conductor. If the conductor is of uniform impedance and properly terminated, the entire transmitted pulse will be absorbed in the far-end termination and no signal will be reflected toward the TDR. Impedance discontinuities will cause some of the incident signal to be sent back towards the source. An open cable tends to reflect a pulse that reinforces the original pulse. A shorted cable causes the reflected signal to invert in polarity and cancel portions of the original pulse at the source which is at the output of the TDR instrument. An intelligent TDR can analyze the characteristics of the net transmitted/reflected pulse combination and relativley accurately calculate and predict cable length, impedance variations, splice and connector location and associated losses.

Megger 800E TDR Time Domain Reflectometer

Megger^®CFL800E (TDR) Multi-Function Time Domain Reflectometer Discontinued Replaced by CFL510F

The Megger^® CFL800E, catalog number 655800E, is a multifunction instrument combining several fundamental tests in one practical, field craft test set. Integrated voltage meter, insulation tester, time domain reflectometer and automatic resistance bridge, provide the test functions for basic cable verification and fault locating on twisted pair, quad and coaxial cables.

Traditionally, cable installers and splicers have been able to use time domain reflectometers (TDRs) to find cable features, impedance anomalies and low resistance faults only (<1000 W for telecom cable; <200 W for power cable). Additional pieces of test equipment have been required to more thoroughly test and verify performance of installed cable. Installers and splicers are then required to carry multiple instruments, learn multiple product interfaces, and make multiple cable connections to handle a single job. The CFL800E provides a simpler, practical approach that can address a wider range of cable verification and cable fault locating issues.

Biddle Megger CFL800E Features
30 ft to 9,000 ft (9 to 3000 m) TDR measurement ranges
Automatic resistance bridge with measurement range
   up to 300,000 ft (100 km)
Insulation Tester
Voltmeter
Suitable for power, telecom, coaxial, and datacom cables
Dust and waterproof to IP54
Three-year warranty
Uses standard AA cells

Biddle Megger CFL510F - General Purpose TDR Time Domain Reflectometer

 CFL510F-Advanced Cable Fault Locator

The MEGGER CFL510F is an advanced instrument capable of identify­ing a wide range of cable faults using Time Domain Reflectometry technology. It offers exceptional features and a range capa­bility normally associated with larger, more expensive instruments. The mea­surement range spans from 30 feet to 9,000 feet, with a minimum resolution of four inches.

Compact-Portable CLF510F  Time Domain Reflectometer

The MEGGER CFL510F is a compact, hand-held, ergonomically engineered Time Domain Reflectometer designed for field use. As such it is housed in tough, ABS flame-retardant housings and protected from the ingress of dust and moisture to IP54. Additionally, a multi-purpose test and carry cases designed for hands free neck-strap and tool-belt use are provided.

The Megger CFL510F can be used on any cable consisting of at least two insulated metallic elements, one of which may be the sheath or shield of the cable. The CFL510F has internal matching networks to allow testing of 25Ω, 50Ω, 75Ω, and 100Ω cables. (These correspond to power, cellular, CATV, and telephone cable). The Fast-Find key simplifies waveform interpretation by automatically adjusting the instrument's range and gain and places the measurement cursor at the major event on the cable.

Megger CFL510F Measures Long Cables

The CFL510 can be closely matched to the cable using the balance control allowing long lengths of cable to be easily tested and faults close to the instrument accurately measured. The propagation velocity value can be similarly adjusted to match the cable; thus ensuring an ac­curate distance measurement. To enable a wider range of faults to be detected, the gain of the CFL510 is also adjustable which helps identify minor faults over the entire cable length.

Biddle Megger CFL510F TDF Features:

 
Ease of use is a key feature and with a simple ‘one Key one function’ approach the CFL510F reduces keying errors and consequently results in shorter test times
Automatic Event Location

Simplified Operation

Reduced Training Time

Six Ranges

Testing for Power, Cellular, CATV, and Telephone Cables

Large High Resolution Backlit LCD Easy to Read Display

25Ω, 50Ω, 75Ω, and 100Ω Output Impedance

Gain, Balance, and Contrast Controls Front­ Panel Accessible

Fast-Find Automatic Event Locator

CFL510F ORDERING INFORMATION LISTED BELOW

Biddle Megger CFL535F (TDR2000/2) - Dual Input TDR with RS232 Interface 655535F

The MEGGER Model CFL535F or TDR2000/2 is an advanced instrument capable of identifying a wide range of cable faults using Time Domain Reflectometry. The CFL535F can be used on any cable consisting of at least two insulated metallic elements, one of which may be the sheath or shield of the cable. Dual inputs and large graphic display allow a wide range of comparative tests to be performed between cable pairs or stored traces. The instrument has 15 trace memories, which allows previous test results to be displayed. The included download software allows transfer of the waveform data to a computer, for analysis and storage for future reference.

Megger's CFL535F Two Color Display Choice

The CFL535F is a state of the art, monochrome or color, dual channel Time Domain Reflectometer, capable of identifying and locating a wide range of faults on metallic cables. The CFL535F  has a minimum resolution of 0.1m and a maximum range of 20 km at VF=0.9 and 16 Km (48,000 ft.) at 0.65 VF. The CFL535F can perform single or dual channel measurements on a wide range of metallic cables. Active channels can be compared with each other or with previously stored traces from memory. Differential channel measurements are possible and cross talk between channels can also be identified. All results are displayed on a high resolution, QVGA color display. Full contrast adjustment provides optimum display contrast in a variety of ambient light conditions

Megger CLF535 Features:
Either Color or Monochrome Displays

Dual input and output ports

RS-232 interface to a PC or printer (software included)

Help menu

Five (5) user selectable pulse widths per range

Trace averaging

20 km range at VF = 0.90

Primary cell or rechargeable options

Large backlit LCD Display

Dual cursor measurement

Intermittent fault location

Output pulse amplitude and width control

"TX Null" technology

No blocking filter required

Trace Master PC software included

CFL535F ORDERING INFORMATION LISTED BELOW

Megger TDR500 Time Domain Reflectometer

Biddle Megger Model TDR500
General Purpose Time Domain Reflectometer

The MEGGER TDR500 Cable Fault Locator breaks new ground as a cost-effective, high specification hand-held Time Domain Reflectometer for locating faults on metallic cables. Designed for the field engineer requiring a low cost solution to field testing, the TDR500 offers all the benefits of MEGGER quality and reliability in an affordable package.

TDR500 Perfect for Data Transmission Cables

Megger’s TDR500 is suitable for all types of metallic transmission cables including twisted pair, coaxial and parallel conductors. Condition of the entire cable or section is graphically displayed.

TDR500 Suitable for Long Cable Faults

The TDR500 is suitable for identifying and locating a range of cable faults from 100 ft to 10,000 feet on non-energized cables. Cable characteristics are clearly dis­played on the large 122 x 32 pixel LCD.

TDR500 Simple to Operate

Operation of the TDR500 is simplicity itself. No multifunction keys to confuse the operator. Each button has its own dedicated function. Simply connect the test lead to the de-ener­gized cable to be tested. Switch on the TDR500 and set the velocity factor. The TDR500 can inject an oscillating 810 Hz/1.11 KHz tone onto the de-energized transmission line or power line. The warble tone allows the engineer to trace the faulty cable pair with the use of a commercially available tone trac­ing probe.

Megger TDR500 Features:

Simple Operation

Warble Tone Generator

Velocity Factor from 0.30 to 0.99

Range to 10,000 Ft (3 Km)

Tough IPS4 ABS Case IP54 Environmental Protection

Carry Case and Test Leads Included

3-Year Warranty

Short Range Mode (100 Ft)

Accurate on Near-End Faults

Ideal for Short Cable Lengths

Insulated Test Lead – Operator Cannot Touch Signal Conductors

Dry Cell or Rechargeable Batteries

Biddle Megger Model TDR900
Time Domain Reflectometer

The Megger TDR900 is an advanced instrument capable of measuring cable lengths and finding distance to an open or a short using Time Domain Reflectometry technology. It offers exceptional features and a range capability normally associated with far more expensive instruments.  The measurement range spans from 15 feet (5m) to 10,000 feet (2Km) with a minimum resolution of 20 inches (50cm).

Megger TDR900 Great for Shielded Cables
The TDR900 can be used for any cable consisting of at least two insulated metallic elements, one of which may be the sheath or shield of the cable.  The TDR900 has automatic internal matching networks to allow testing of 25Ω, 50Ω, 75Ω, 100Ω, 125Ω, or 150Ω cables.  (These correspond to power, telephony, CATV, and LAN cables.)

TDR900 Adjustable Propagation Velosity
The TDR900 can be closely matched to the cable under test using the menu selection keys. The propagation velocity value can be similarly adjusted to match the cable under test thus ensuring an accurate distance measurement. The other user adjustable setting changes the distance measurement units to feet or meters.

Ruggedized TDR900
The TDR900 is housed in a rugged ABS enclosure which is dust and weatherproof to IP 42. The unit also comes with a soft carrying case and an alligator clip adapter. It is powered by 4 AA (NEDA 15A or NR 6) batteries, which are stored in a compartment on the back of the meter.

Megger TDR900 Features:

Range to 10,000 feet
Accurate to 20 inches
Internal library of 39 standard cable types
20 Internal memories of custom cable settings
Tough ABS case
Extra-large LCD display
Auto-Power-Off: Conserves battery life
3-year warranty
Carrying case included

TDR900 ORDERING INFORMATION LISTED BELOW

• • MEGGER Model	Description	Data	MSRP	Our Price	Buy
    CFL800E	Megger CFL800E Time Domain Reflectometer Order# 655800EDiscontinued
    CFL510F	Megger CFL510F Time Domain Reflectometer 10,000 ft. 655510F		$1610.00	$1529.00	Buy Now
    CFL535F	Dual Input TDR With Monochrome Display and Disposable batteries Order #655535F 0~48,000 ft.		$3055.00	$2899.00	Buy Now
    CFL535FM	Dual Input TDR With Monochrome Display and Rechargeable batteries Order # 655535FM 0~48,000 ft.		$3170.00	$3011.00	Buy Now
    CFL535FR	Dual Input TDR With Color Display and Rechargeable batteries Order # 655535FR 0~48,000 ft.		$3285.00	$3120.00	Buy Now
    TDR2000/2	Megger TDR2000/2 Time Domain Reflectometer(CFL535F)		$3055.00	$2899.00	Buy Now
    NIST	NIST Traceable Calibration Certificate			$110.00	Buy Now
    TDR500	Megger TDR500 Time Domain Reflectometer 10,000ft.		$655.00	$619.00	Buy Now
    TDR900	Megger TDR900 Time Domain Reflectometer 0~12,000ft.		$380.00	$361.00	Buy Now
    EV6420-125	Test & Carry Pouch for 655510F			$119.00	Buy Now
    EV6420-114	Test & Carry Pouch for 655535F			$155.00	Buy Now
    EV6231-653	Bed of Nails Test Lead Set for 655510F			$160.00	Buy Now
    EV6231-655	Bed of Nails Two Test Lead Sets for 655535F			$255.00	Buy Now

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