| 摘要 |
PURPOSE:To make it possible to regulate the output voltage easily by making it possible to control the output of a power supply from a keyboard, by providing an input method, memory method, arithmetic method, reporting method, etc., which are all operated by keys. CONSTITUTION:To regulate an output voltage to 5V, depressing key 5 on keyboard 1 stores display register 4 with numeral 5 in binary-coded decimal code through arithmetic control part 2 and arithmetic operation part 3, and also displays it on display unit 5 at the same time. With key OUT= depressed next, the contents of display register 4 are converted into a binary numeral by arithmetic control part 2 and arithmetic operation part 3 and inputted to A register 6. Then, the contents are converted into an analog value by D-A converter circuit 12 through output buffer 11 and a voltage of 5V is developed across the power supply by control circuit 14. Further, the upper-limit value of the voltage is stored in D register 9 and each input is compared with it by arithmetic control part 2; when it exceeds the upper-limit value, alarm lamp 5a comes on, thereby preventing an unneeded voltage from being applied. |
