connected to the cable core, and the other side of the multimeter is grounded. At this time,Ground the opposite cable core at the other end, The multimeter shows connectivity,Disconnect the grounding of the other terminal core,The multimeter shows disconnect.Repeat the above steps and measure each core of the cable3.5. The tested equipment recovered after the test.3.5.1. Remove the test fuse and test lead.3.5.2.Restore the original state of the device. 3.6.Completion of test report.3.6.1.Correctly record and review the test data during the field test.3.6.2.Issue a qualified test report.