Tianjin, China
Business Type:
Business Range:
Consumer Electronics, Electrical & Electronics, Industrial Equipment & Components, ...
Plant Area:
501~1000 square meters
Management System Certification:
ISO 9001
Main Markets:
North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, ...
OEM/ODM Service
Sample Available
MEI Awards

Cable Fault Location, Locating System, Compass Indication manufacturer / supplier in China, offering Tdrl 970 Cable Fault Location, 200rpm Toroid Transformer Coil Winding Machine, Grewin Tdr Icm MIM 100km Cable Fault Test Equipment for Prelocating System and so on.

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Tdrl 970 Cable Fault Location

Min. Order / Reference FOB Price
1 Piece US $100-10,000/ Piece
Port: Tianjin, China
Production Capacity: 50000PCS/Year
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram
Model Number: Tdrl 970
Measurement Distance: 0-30km
Impulse Range: 30V for Unipolar ±30V for Bipolar
Impulse Width: 80ns-10μs, Auto Adjustments
Adjustable Gain Range: 0-80dB
Blind Zone: 1m

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Basic Info.

Model NO.
TDRL 970
Wave Velocity Range
0.6kgs Without Battery
Supply Power
Chargeable Battery, 7.2V
Transport Package
Standard Export Packing
HS Code
TDRL 970 Cable Fault Location

The TDRL-970 Telecom Cable Fault Locator is a portable handheld device 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.

TDRL 970 Cable Fault Location Function Introduction:
  1. TDRL(Time Domain Reflectometry)method make it possible to measure broken fault,cross fault,insulation fault and so on.
  2. Automatic measurement
  3. Auto power-off when sleeping and low battery voltage
  4. Friendly user interface,easy to operate
  5. Handheld device,easy to carry
  6. Digital signal processing.Digital compensation according cable attenuation characteristic to make the similar reflection amplitude to correctly distinguish
  7. Inner chargeable battery

impulse test display
TDRL-970 Communication cable fault locator including main engine,testing lines and documents.Main engine as below 
Tdrl 970 Cable Fault Location

  1. LCD screen:7 inches color screen
  2. Basic function:
  • Choose suitable testing range automatically and locate the most possible fault point
  • Press one time for one testing
  • Change the wave velocity
  • Change the range
  • Move the cursor
  • Adjust the single gain
  • Locate the fault point automatically in current range        
  • Temporary store the current waveform
  • Display the current waveform and stored waveform
  • Waveform zoom in/out
  • Power on/off
  • Unipolar/bipolar difference switching
  • Press one time to switch the solid cursor and virtual cursor
Gain C.
  • Switch auto gain compensation

Top introduction,pic. as below 
Tdrl 970 Cable Fault Location

  • Connect the charger 
  • Connect the test line with the target cable
  • Unipolar test use this jack
  • bipolar test to connect the fault line pair
  • bipolar test to connect the reference line pair

Display interface when working

Tdrl 970 Cable Fault Location
Interface introduction

  • Battery lever
  • Unipolar / bipolar difference mark
  • Temporarily store mark
  • Comparing mark
  • Gain compensation mark
  • Distance
  • Transmitted impulse
  • Connection reflection impulse 
  • Reflection impulse of cable fault point
  • Solid cursor


Fault determined
When cable fault appeared,pls first judge fault feather and broken lever.The communication fault are divided into three kinds as below:
  1. Broken fault:cable broken and communication
  1. Crossing fault which is generally classified into three kinds:
grounding fault,self-crossing fault,and common crossing. During these conditions,the insulating layer was broken even touched to affect the communication quality.  

Defective insulation fault:

The cable core is entranced by moisture or water to reduce the insolation resistance.The difference between this and above crossing fault is this has a big 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.


Lines connection

Before testing,pls disconnection inside devices with problem cable first.
Then inside testing to make sure the rough location of the fault point.
After then,go to the filed to pinpoint the fault.
When testing,connect the Main jack with the testing clip to nip the fault line pair.

     Choose testing range
  1. 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:250m,500m,1km,2km,4km,8km,16km,30km.
Press Range +/- buttons to change the testing range

Setting the wave velocity
According different cable material,user should choose different wave velocity.
  • Change the wave velocity
Adjustable range
  • 100-300m/μs 

*Some common cable pls take below for reference:
Plastic power cable
  • 201m/μs 
Polyethylene power cable
  • 192m/μs 
Oil filled cable
  • 160m/μs 
paper pulp insulated cable
  • 216m/μs 
Accurate measurement,use the method in page ,to calibrate the wave speed
Gain adjustment
Gain +/- button  
  • Adjust single gain,increase or reduce
  • Auto testing for every time the gain changing

Cursor positioning

The beginning of the reflection impulse waveform is the fault position.When move the cursor into this position,for example,the virtual cursor in pic.5,there will be a distance appear in the right corner of the screen which is the fault distance.
Pls notice,if the cursor on other position,the distance is not useful.
*Auto position: Press "Auto"key,device will automatically position.If deviation,pls position manual. 

Manual positioning:
Press  to move the cursor.Pic.6 is a representative cross waveform,the downward wave is crossing fault,the upward waveform is broken fault. 

Waveform size and zoom
To get a higher resolution,pls use zoom in/out function.
Press   button to zoom in when  to zoom out.
*When 'Zoom out',auto positioning function is not workable.

Waveform temporary storage and compare
It's easier to distinguish the fault type through comparing the good cable and fault cable.
Waveform compare
  • Test to get the fault waveform and press TS to keep it.There's a TS mark on the left corner of the screen.
  • Test a good cable under the same condition.Press Comp. To show the two waveforms together and there'll be a compare mark on the screen.
Relative distance measurement(zero point of the cursor)
To get the distance between the fault point and the reference point,for example,the cable connect,pls operate as below:
  • The solid cursor on the default zero position
  • Move the virtual cursor to the fault point,and press Zero key to change the positions of solid cursor and virtual cursor.Now the solid cursor on the position of the fault point and virtual cursor on the zero position.

Move the virtual cursor to the refence point,then the distance is the relative distance between two cursors as pic.8.Press Zero again to exchange the solid and virtual cursor.

Gain compensation setting
The device default gain compensation is 0.4mm dia. Wire. Device compensate according the 0.4mm wire attenuation characteristic.
If the target cable is not 0.4mm wire,press Gain com. again to cancel gain compensation function.

Differential measurement
Use this method to get the different waveform of fault wire pair and good wire pair.It's useful to distinguish the cable fault distance.
  • Press Diff key,the signal pair on the left corner of the screen will change to differential.
  • Connect another testing line with the auxiliary jack. Connect the main testing line with the fault line,auxiliary jack with the good cable wire pair.
  • Test to get two pairs difference waveform
  • Press Diff. Key to return to the signal pair mode.
  1. Auto testing
Press Auto key,the device will automatically test,choose range and position cursor.The result is only for reference. 
Wave velocity correct
According now the cable length,we could correct the wave velocity.
Use same known length cable and test the opposite terminal open circuit and short circuit waveform and compare.Move the virtual cursor to the obvious difference and change the wave velocity to make the tested distance same as the known length.Then the velocity is the real fo this cable. 

Instrument Maintenance


If the battery lever is low,we need to charge or change battery.The device will automatically power off when the battery voltage is too low.
The indicating light on the charge indicate the charge status:Red indication means continue,the green light means finished.The charge time is about 4 hours,it's not strict and will not damage the battery.

TDRL 970 Cable Fault Location Tech. Specifications

Measurement distance0-30km
Resolution ratio0-1km,below 1m;
2km,below 2m;
4-30km,below 8m
Impulse polarityUnipolar below 2km
Bipolar above 2km
Impulse range30V for unipolar
±30V for bipolar
Impulse width80ns-10μs,auto adjustments
Blind zone1m
Wave velocity range100-300m/μs
Adjustable gain range0-80db
Supply powerChargeable battery,7.2V
Charger powerAC 220V±10%,50Hz
Weight0.6kgs without battery
Operating Temperature -10ºC-40ºC

TDRL 970 Cable Fault Location Product:

Tdrl 970 Cable Fault Location
Tdrl 970 Cable Fault Location

ISO,CE,IEC Certificate:

Tdrl 970 Cable Fault Location

Company Introduce:
Tianjin Grewin Technology Co.,Ltd have twenty years producing experience, located in Tianjin , China, our company have professional design term, advanced technology and equipment, especially pay great attention to its business philosophy "Quality and Honesty First". Grewin is specialized in the design and manufacture of  intelligent power meter and testing device, such as Three/single Phase Multi function Meter, Power Monitoring device,Intelligent Pipe Locator,Route tracing/Cable identification/depth measurement/grounding fault location and so on;especially the EPM and TPM product got inland and over sea's clients praise, and established OEM or ODM relationship. Our products have passed and obtained ISO9001 certificate ,CE certificate,SGS approval, and IEC report. We have developed good cooperative relationship with valued customers around the word, have first class product quality and one basket value-added after sales service along with the fast efficient solution. Grewin has won its brand in word wide. 

Contact Information:

Alice Lee

Add:Meinian Plaza.No .16 Dongting Road,Hexi Distr,Tianjin,China .
Tel: +86-22-84943756
Web: www.grewin-tech.com 


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