| 摘要 |
PURPOSE: A portable data communication line tester is provided to transmit oscillation signal to an installed line. CONSTITUTION: A connection control circuit part(900) is connected to a signal output line of a signal receiving circuit part(500) and a monitor circuit part(600). The connection control circuit part is selectively connects the signal output line of the monitor circuit part or the signal receiving circuit part to a speaker(400). A main control unit(930) controls the signal receiving circuit part, a monitor circuit part, a data sensing circuit part(800), and a connection control circuit part by the electric signal which is inputted through a dial circuit(720) of a communication part(700) and a switching-circuit part(161). |
