| Customization: | Available |
|---|---|
| Connectors: | Terminal |
| Test Mode: | Instant Test |
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Product: 30KM Cable Fault Locator Detecting Location for Cable Broken and Communication Disconnect
Introduction
The TDRL-950 Cable Fault Locator is a portable handhold 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.
It is a simple locating device, adopts to kinds cable and specially, the telecomputer cable.
Design Features
l TDRL(Time Domain Reflectometry)method make it possible to measure broken fault, cross fault, insulation fault and so on.
l Automatic measurement
l Auto power-off when sleeping and low battery voltage
l Friendly user interface, easy to operate
l Supply by dry batter or recharge battery
l Handheld 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 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
l Fault determined
When cable fault appeared, pls first judge fault feather and broken lever. The TDR fault are divided into three kinds as below:
n Disconnection fault: cable broken and communication
disconnect.
n 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.
n Defective insulation fault:
l Choose testing range
n 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.
n This device offer below six testing ranges to choose, 125m,
250m,500m,1km,2km and 4km.
n Press 1 or 2 button to change the testing range.Check
'basic function' for reference.
n 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:
Bella
Tianjin Grewin Technology Co.,Ltd.
Website:transformer.en.made-in-china.com
Tel:86-22-84943756
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