| 摘要 |
PURPOSE:To achieve a quick and accurate cable test with a simple construction by controlling indication, pattern transmission or the like in comparison with an automatically transmitted test pattern with a reception pattern. CONSTITUTION:In response to the operation of a switch 10, an AND gate 14 opens through an FF8 and a high level transmitted pattern signal is applied to each terminal of a connector 1 connected to a cable from a shift register 5. The signal is compared with a reception pattern signal of a connector 2 by means of a comparator 6. Upon the end of a test, the gate 14 is closed by a high level output from the final terminal of connectors 5 and 6 through an OR circuit 7 and an FF8. At the same time, specified lamp on input and output indicators 3 and 4 come on to indicate the normal condition. In case of any disconnection and/or short-circuiting during the test, the output of the terminal 6-1 of the comparator 6 turns to a high level to indicate defective parts and the type of dificiency on the indicators 3 and 4 while transmission patterns continue to be supplied to the terminal. This enables a quick and accurate test with a portable and simple construction. |
