| 摘要 |
PURPOSE:To enable dry-bulb temp. and relative humidity to be displayed easily with one unit of apparatus by compensating a dry-bulb temp. signal and a wet-bulb temp. signal with a reference contact compensator, storing these in a memory device and operating the same with a central processing unit. CONSTITUTION:When a switch S for shortcircuiting and the change-over switches 21, 22 of an input change-over switch 2 are successively opened and closed, the dry-bulb temp. input signal and wet-bulb temp. input signal supplied to input terminals 11, 12 are taken in. These signals are superposed with compensation voltage E0 by a reference contact compensator 3, thereafter, they are stored in a memory device 7 by a central processing unit 6 by way of an amplifier 4, an A-D converter 5. On the other hand, the switch S for shortcircuiting closes as well at every one cycling of the input change-over device 2, and the reference voltage e0 is stored in the memory device 7. The unit 6 makes linearizing operation and further makes relative humidity operation after compensating drift by deducting the reference voltage e0 from the detected values and displays the temp. and relative humidity in a display device 8. Thereby, the drift of an amplifier and the errors between the inputs with each other are eliminated. |
