0-8km Measurement Distance Cable Fault Locator Detecting Location for Testing

Product: 0-8km Measurement Distance Cable Fault Locator Detecting Location for Testing

Introduction

TheTDRL-950 Cable Fault Locator is aportablehandholddevice used for locating the broken fault, cross fault, insulation fault and so on. It can be used to measure the cable length, wave velocity and distinguish the middle joints and terminals.

It is asimple locating device, adopts to kinds cable and specially, thetelecomputercable.

Design Features

lTDRL(Time Domain Reflectometry)method make it possible to measure broken fault, cross fault, insulation fault and so on.

lAutomatic measurement

lAuto power-off when sleeping and low battery voltage

lFriendly user interface, easy to operate

lSupply by dry batter or recharge battery

lHandheld device, easy to carry.

Tech. Specifications

Measurement distance

0-8km

Resolution ratio

0-1km,below 1m;

2km,below 2m;

4-8km,below 8m

Impulse range

30V

Impulse width

80ns-5μs,auto adjustments

Blind zone

1m

Wave velocity range

100-300m/μs

Adjustable gain range

0-80db

Supply power

AA battery x6pcs

Volume

225mmx155mmx50mm

Weight

0.42kgs without battery

Operating Temperature

-10ºC-40ºC

Humidity

5-90%RH

Elevation

<4500m

workingprinciple&Product Structure

Basic working principle

Distance locating:

This device using TDR(Time Domain Reflectometry).When locating,low voltage pulse is injected into and spread along the cable until reach the impedance mismatch point.These points include the short circuit point, fault point,middle connector and so on.When reach these points,the pulse reflection will be send back and record.See Figure.1

Figure 1shows afault point in acable,is the time during transmitted pulse and pulse reflection is received,so fault point distance:

lDeviceconfigurations

T-950 cable fault locator including main engine, testing lines and documents.

lDisplay interface when working

1

ØTransmitted impulse

2

ØBattery lever

3

ØTemporarily storemark

4

ØComparing mark

5

ØCursor

6

ØDistance

7

ØReflection impulse of cable fault point

8

ØWave velocity

9

ØMeasuring range

10

ØGain

11

ØDisplay scale

Application

Fault determined

When cable fault appeared, pls first judge fault feather and broken lever. The TDR fault are divided into three kinds as below:

Disconnection fault: cable broken and communication

disconnect.

Crossing fault which isgenerally classified intothree kinds:

grounding fault, self-crossing fault, and common crossing. During these conditions, theinsulating layerwas broken even touched to affect the communication quality.

Defective insulation fault:

Choose testing range

To get complete testing waveform,the testing range should

be several hundred meters longer than the length of the cable.For example,if the cable is 900m,the testing range should be 2km.when found the fault point closer,reduce the range accordingly.

This device offer below six testing ranges to choose, 125m,

250m,500m,1km,2km and 4km.

Press 1or 2button to change the testing range.Check

'basic function' for reference.

Pls notice that,the device test once automatically after once range changing.

The cable corn is entranced by moisture or water to reduce the insolation resistance.The difference between this and above crossing fault is this has abig resistance, common over thousand Ohms.

In generally, for above first and second fault, it's easy to detect by pulse test, but for the third, user should consider the cable path, time of fault, range of the fault, environment and so on.

Instrument Maintenance Charge

Standard configurationis 6AA NI-MH battery ,capacity above

1300mAH is better.Dry battery is also ok if no NI-MH battery if necessary but need high capacity ones.

*Pleasenotice don't putthe battery backwards.

Contact Information:

Bella
Tianjin Grewin Technology Co.,Ltd.
Website:www.grewin-tech.com
Tel:86-22-84943756