| 摘要 |
PURPOSE:To inform the optimum period of exchange of camera components, by displaying the life of a television camera on a receiver in bar or figure. CONSTITUTION:An image obtained from a pickup tube 3 reaches a receiver 2 via an amplifier 4 and a mixing circuit 5 for normal display to the position of scanning lines designated for the systhesis with a synchronizing signal generator 6. When the section 6 comes to the position of scanning line designated for the systhesis, a signal from the amplifier 4 and an output of a mechanical counter 11 are applied to the mixing circuit 5. Thus, black display is made for the television receiver 2 as to some scanning lines and the length represents the power application time to a camera. Thus the life of the camera can be known from this display. |
