| 摘要 |
There are two coaxial cable test instruments, of which a primary instrument provides a rump circuit having a battery, a first electric signal device and two probes in series-connection with each other, of which the probes are in the form of the central conductor and surrounding shield parts of a typical coaxial cable connector. The other or secondary instrument provides a second electric signal device which is connected with two further probes in the form of the central conductor and surrounding shield parts of another coaxial cable connector. To test a cable component for a short-circuit, the primary instrument is connected with one of the end connectors of the cable. If the first signal device, for instance a light bulb, then lights up on closure of the rump circuit via the short-circuit bridge between the central conductor and surrounding shield of the cable, the lighted bulb will clearly indicate the short circuit in the cable. However, if the rump circuit remains open, the bulb does not light up and thereby indicates that there is no short-circuit. For a conductivity test of the cable component. Both instruments are connected with both end connectors on the cable. If the rump circuit is then closed via the conductor and shield parts of the cable and the second signal device of the secondary instrument, both signal devices will operate and thereby indicate conductivity of the cable. Conversely, if both signal devices fail to operate, this is a clear indication that the cable lacks conductivity.
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