| 摘要 |
PURPOSE:To discover disconnection and short-circuiting by checking for terminal potentials at one end of a plurality of wirings under various conditions, where the application of a voltage or grounding is made possible through a resistance while the other end thereof is allowed to be grounded with an earth conductor. CONSTITUTION:Wirings 2a-2c are free one end thereof and will be short- circuited between each other with an earth conductor 7 in a disconnection test. At the other end, the wiring are connected to a receiver 3 through connectors 8 and 9. Input wires A-C of the receiver 3 are connected to a test voltage source separately through resistances 11a-11c and 10a-10c while allowed to be grounded through the resistances 11a-11c and switches 6a-6c. This enables the setting of levels of the terminals A-C depending on the state of the switches 6a-6c. Based on the setting, a test for disconnection and short-circuiting can be done. |
