• Model NO.：TDRL-901
• Test Region：Forming Cable
• Cable Type：Customized
• Power：Electricity
• Certification：CE, FCC, RoHS, IEC
• Customized：Non-Customized
• Color：White
• Automatic Measurement：Easy to Operate
• Auto Power-off：Recharge Battery
• Friendly User Interface：Easy to Carry
• Measurement Distance：0-8km
• Resolution Ratio 1：0-1km, Below 1m;
• Resolution Ratio 2：2km, Below 2m
• Resolution Ratio 3：4-8km, Below 8m
• Impulse Range：30V
• Impulse Width：80ns-5μs
• Blind Zone：1m
• Transport Package：Carton or Pallet
• Specification：portable
• Origin：China
• Production Capacity：5000000

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 x 6pcs

Volume

225mm×155mm×50mm

Weight

0.42kgs without battery

Operating Temperature

-10ºC-40ºC

Humidity

5-90%RH

Elevation

<4500m

working principle&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 1 shows a fault point in a cable, Δt is the time during transmitted pulse and pulse reflection is received,so fault point distance Lx :

V:pulse Traveling-wave speed.

lDevice configurations

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

l Display interface when working

1

Ø Transmitted impulse

2

Ø Battery lever

3

Ø Temporarily store mark

4

Ø Comparing mark

5

Ø Cursor

6

Ø Distance

7

Ø Reflection impulse of cable fault point

8

Ø Wave velocity

9

Ø Measuring range

10

Ø Gain

11

Ø Display 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 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:

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 1 or 2 button 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 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.

Instrument Maintenance Charge

Standard configuration is 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.

*Please notice don't put the battery backwards.

Contact Information:       
 
Tianjin Grewin Technology Co.,Ltd.
Website:transformer.en.made-in-china.com