| 摘要 |
PURPOSE:To make it possible to automatically detect the trouble of a receiver, by applying a diagnostic pulse for diagnosing trouble to a receiver, and investigating the response signal of the receiver to said pulse. CONSTITUTION:Now, when a receiver 4 gets out of order or is deteriorated, no resonance vibration is generated even if the diagnostic pulse is applied and, therefore, the output S16 of a diagnostic integration means 16 does not reach the predetermined reference value Vr2 of a diagnostic comparing means 17 and the output S17 of the comparing means 17 holds logical ''0''. Therefore, if the receiver 4 is normal and the comparing means 17 issues output S17 at every predetermined cycle T1, the output of a trouble discriminating means 18 always comes to logical ''1'' and a lamp 19a is not lighted but, when the receiver 4 gets out of order, the lamp 19a is lighted to display trouble. By this method, the trouble of a receiver can be automatically detected. |
