| 摘要 |
PURPOSE:To display the current value and maximum value of input signal levels with simple circuits by changing over the AD conversion value at the current point of time and the maximum value having been stored and held and controlling the operation of a read-on-memory. CONSTITUTION:When a changeover signal input terminal 119 is set at L, the AD conversion outputs 1-3 of input signal levels are inputted to a decoder 43, and only one of output terminals 51-58 is selectively set at H. At this time, a read-only- memory circuit 59a operates normally, and the current value is displayed in a bar graph by 8 pieces of LEDs connected to the output terminals 111-118. Next, when the input terminal 119 is set at H, the signal code of the maximum value having been stored in a storage circuit 5 is outputted from a signal selecting circuit 4. Since the memory circuit 59a is inhibited of operation, the output of the decoder 43 is transmitted as it is to the output terminals 111-118, and only the one point corresponding to the maximum value is displayed. Thereby, the current value is displayed by a bar graph and the maximum value is displayed in combination as well. |
