Cable tester

A cable tester is used to test cables and cabling systems. Simple tester only test cable assignment and galvanic connection, high-quality cable tester can also insulation resistance and channel capacity, impedance measure.

Message transmission

Through a cable tester can also be the function of lines of communication are controlled ( see Figure - tester for network cables ). This may for example be checked whether the individual line pairs are mutually electrically insulated and that all pairs of wires to communicate with sufficient signal levels is possible.

Still can be checked with high performance test systems of the characteristic impedance of the data lines. If there is a line damage, thus the short-circuit point between individual lines or the Erdschlussstell can also be measured by AC measurement. Furthermore, line bruising can lead to impairment of data transmission over communication lines. The same case is when communication lines are relocated to a small bending radius. In this case, changes of the impedance of the line so that there may be loss or reflection of the transmitted signal. This change of impedance can be carried out with a characteristic impedance measuring device.

Energy supply

Before commissioning of electrical wiring for power supply, they must be reviewed and approved. For example, consider a line with five individual wires. This beisitzt three phase conductors (L1, L2 and L3), neutral (N ) and protective earth (PE). In this case, the electrical resistance of all five individual wires by means of a resistance meter to be checked. In addition, the insulation resistance of all five conductors must be checked each other by an insulation measurement. This results in a uniform clockwise rotation, the rotating field of the three phase conductors must be checked by means of a rotating field measurement. Cable testers offer these different methods in a single instrument.

Moreover, with a cable tester in case of failure the fault (eg short circuit between two or more conductors, ground fault of a conductor ), the fault location can be narrowed down by measuring the resistance ( DC measurement or AC current measurements ) so that the line does not have to be fully exposed.