| 摘要 |
PURPOSE:To automatically calculate an average up/down speed at the time of movement by measuring a vertical distance between two points and the time required for the movement by using a pressure sensor. CONSTITUTION:An oscillation frequency from an oscillation circuit 6 is divided to 1P/S by a frequency divider 7, a motor 10 is forward driven by a step motor driving circuit 9 and a stylus is driven 12 to apply time information from a time counting circuit 8 to a CPU21. The CPU21 sets a FF13 by a signal (a) based on a switch input from a switch part 17, opens an AND gate 14, inputs the signal 1P/S as a manometer side synchronizing signal to the gate 14 and switching to a clock mode is executed by a signal (b). A pressure sensor 2 detects the pressure of a current position by a signal (c), the detected pressure is A/D converted by an A/D converter 15 and the CPU21 acts as an altimeter in case of <=1 atmospheric pressure, and acts as a hydraulic meter in case of >=1 atmospheric pressure. Under control by the CPU21, information is written/read out in/from a RAM20, an alarm is generated from a buzzer 19 at the time of detecting a set altitude difference and water depth difference, and current time, altitude, water depth, an average speed, etc., are displayed on a liquid crystal display 4. In said constitution, a clock capable of detecting an average up/down speed can be obtained only by selecting a switch in a switch part 17. |
