| 摘要 |
PROBLEM TO BE SOLVED: To provide an installation checker performing signal transmission in a manner of digital modulation system used for collective housing interphone apparatus to reliably test and evaluate the transmission performance.SOLUTION: An installation checker 2 includes: a test transmission section 2a that, receiving a transmission test instruction, transmits a test signal and receives a response signal thereto while sequentially selecting terminals 10; and a test evaluation section 2b that evaluates the response signal received by the test transmission section 2a to generate a piece of evaluation information for each of the terminals 10. The evaluation information is displayed on each terminal 10. |
