| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a signal subjected to measurement from being made abnormal by short-circuiting abnormality in a measuring instrument or a cable for measurement when measuring a voltage relating to railroad signal equipment. <P>SOLUTION: An auxiliary tool 30 is interposed between a voltage measuring terminal 35 and a cable 23 for measurement with respect to a signal measuring lead wire connecting a voltage measurement spot and a measuring instrument by the cable 23 for measurement. The auxiliary tool 30 comprises a measuring terminal side connector 31 corresponding to the voltage measuring terminal 35, a measurement cable side connector 33 corresponding to another-end connecting terminal 34 at another end side of the cable 23 for measurement, an insulated tubular holder 32 holding the connectors in both ends, and an interposed resistor R30 which is built in the tubular holder 32 and connected to the connectors 31, 33. A resistor of which the resistance value is smaller than input resistance of the measuring instrument and larger than resistance between two voltage measurement spots, is used as the interposed resistor R30. <P>COPYRIGHT: (C)2013,JPO&INPIT |
