| 摘要 |
PURPOSE:To improve adjustment and maintenance and to impart excellent operability, by cyclically bringing an apparatus to an adjusting state by a state change-over switch and selecting each output voltage at this time by an output selection switch. CONSTITUTION:At first, when a state change-over switch 28 takes a measuring state, a relay is changed over by the control signal from a timing control circuit 21 and output voltages from the photoelectric converter elements 16, 10 of first and second light emitter-receivers 1, 2 are successively sent to an A/D converter 24 through a band-pass amplifier 23. A change-over switch 30 is closed to the side of a contact (a) to be connected to a processing part 25 and, by this operation, the output from the converter 24 is inputted to the processing part 25 to undergo arithmetic processing and light transmissivity is displayed by a display device 26. When the switch 28 is changed over to an adjusting state, the relay 22 sends one of output voltages to the converter 24 according to the selection of an output selection switch 29. At this time, the switch 30 cooperates with the switch 28 to be closed to the side of a contact (b) and the output voltage from the relay 22 receives A/D conversion by the converter 24 to be displayed on the display device 26. |
