Business Type: Manufacturer/Factory
Grewin high quality electronic Testing system TDRL-901Cable Fault Locator
Wave velocity range
Adjustable gain range
AA battery x 6pcs
0.42kgs without battery
working principle&Product Structure
Basic working principle
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.
T-950 cable fault locator including main engine, testing lines and documents.
l Display interface when working
Ø Transmitted impulse
Ø Battery lever
Ø Temporarily store mark
Ø Comparing mark
Ø Reflection impulse of cable fault point
Ø Wave velocity
Ø Measuring range
Ø Display scale
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
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.
Tianjin Grewin Technology Co.,Ltd.
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