| 摘要 |
PURPOSE:To make is possible to precisely monitor disordered signatures, by automatically compensating the sensitive characteristics of more than six of photosensors in the senser section of a device for monitoring disordered signatures so that all amplifier outputs have substantial same levels with respect to two reference inputs. CONSTITUTION:The sensor section of a device for monitoring disordered signatures has at least six photosensors 81 which deliver signals to an A/D converter 85 through an amplifier 82. These signals are stored in a standard memory and a monitor memory, respectively. The amplifier 82 receives the outputs of the photosensors 81 through a positive input terminal, black date B by way of a D/A converter 83 through a negative input terminal and white data W by way of a D/A converter 84 through a gain control terminal 82a. Further, the amplifier 82 is calibrated such that its output becomes zero upon receiving the black data B, but its output becomes 50 upon receiving the white data W. Thus, dispersion in the output chatacteristics of the photosensors 81 may be compensated so that the monitoring of disordered signatures may be precisely made. |
