User Manual Megger Measuring Instruments Tdr500-3 [18/29 Pages]

Megger measuring instruments TDR500-3

Page 18 of 18

Techniques

To improve on the accuracy of the measurement, numerous techniques can be used, depending on the situation encountered.

Not every situation can be described, but the following points are effective and the most common and easily implemented

methods.

Test the cable from both ends

When fault finding on a cable it is good practice to take measurements from both ends, particularly in the case of open circuit

faults, when the true end of the cable is not visible. If the measurement is made from both ends, then the combined answer

should equal the expected length of the cable. Even when the true end of the cable is visible on the display, the reflections after

the fault may be too obscure to analyze clearly. In this case, measurement from both ends yields a clearer picture as well as

improved accuracy. It is also good practice to follow the cable route with a cable tracer, as not all cable runs will be straight. It

can save a great deal of time if the exact route of the cable is known as faults are often found at these points and can be

accredited to third party intervention.

Care and Maintenance

Other than replacing the batteries, the instrument has no user serviceable parts. In case of failure it should be returned to your

supplier or an approved Megger repair agent.

Cleaning the instrument should only be done by wiping with a clean cloth dampened with soapy water or Isopropyl Alcohol

(IPA).