| 摘要 |
PURPOSE:To detect individually a fault of a selected receiver by confirming the receiver selected from the 1st and 2nd receives and measuring the level of the detected output. CONSTITUTION:In detecting a fault of a receiver 3, a signal op selecting the receiver 3 is outputted from the input terminal 10 to a control circuit 7. As a result only a detection output d1 from the receiver 3 is outputted from an output terminal 8 and a signal st representing the selection of the receiver 3 is outputted to an output terminal 9. The control circuit 7 measures the level of the detection output d1 to confirm that the receiver 3 is selected, then the fault detection of the receiver 3 is attained. The fault detection of a receiver 5 is executed similarly. A high frequency signal hf from a transmitter 1 is received by the two receivers 3, 5 in this way, only a detected output of the output d1, d2 for an optional receiver is extracted and the detection output level is measured by the output terminal 8. Which of the receivers 3, 5 is selected is confirmed at the terminal 9 to detect a fault of the receivers 3, 5.
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