Wire harness testers evaluate continuity, resistance, isolation, and other performance factors for multi-strand wire harnesses. In selecting wire harness testers, there are a number of specifications that are of importance. One of the first is the number of test points, that is, the number of wires, tracings, or contact points that the device can test simultaneously. Another key criterion is the test resistance – the resistance value or values of the object or objects being tested. Another key consideration is the maximum voltage. This is the voltage that will be applied to each tested circuit. Typically, suppliers provide the maximum voltage.
Another key criterion in the specification of wire harness testers is the maximum current for each point test. Typically, suppliers provide the maximum current. Also important is the isolation voltage. Isolation voltage represents the level of electrical isolation between the testing equipment and the device or cable being tested. A high value indicates low interference with the tested device and can be important in delicate operations.
There are a number of different configurations to be considered when selecting wire harness testers. Handheld configuration means the devices is handheld. Typically, a user holds the device in one hand and operates it with the other. Wire harness testers with computer board configuration are devices designed to be installed in a personal computer (PC) or used as a sub-card in a larger instrument. Benchtop wire harness testers are instruments that are portable and often include handles. Floor-standing wire harness testers are built to stand on the floor. In addition, other specialized or proprietary configurations may be available for wire harness testers.
When considering the selection of wire harness testers, there are several different features that may be of interest. Automated wire harness testers provide an automated testing mode that does not require constant user setup and operation. Some wire harness testers test capacitors in the test circuit. Still other wire harness testers offer the ability to test diodes in the test circuit, while other wire harness testers offer the capability to test resistors in the test circuit. Wire harness testers with Hipot capability are devices that can apply high potential (Hipot) tests to determine conformance with isolation requirements.
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