| 摘要 |
PURPOSE:To reduce consumption of current and to lessen an error in computation by a method wherein detecting means disposed three-dimensionally are driven in a time-sharing manner for each measuring period. CONSTITUTION:An operation control means 7 controls an X-axis detecting means 1, a Y-axis detecting means 1 and a Z-axis detecting means 3 and an X-axis amplifying means 2, a Y-axis amplifying means 4 and a Z-axis amplifying means 6 on the basis of a signal of a timing generation means 12. Next, a multiplexer 8 selects output signals of the amplifying means 2, 4 and 6 according to a control signal 18 of the control means 7 and an A/D conversion means 9 converts them into digital values. An arithmetic means 13 converts the digital signals into magnetic field strengths and computes an actual magnetic field strength from the components of the magnetic field strengths on the axes X,Y and Z. Moreover, the computed magnetic filed strength, a computed magnetic field strength from data measured after the time of some measuring period, and an integrated value encompassed with the time of the measuring period, are subjected to computation, and the result of the computation is added to the content of an integrated value storage means 14 and stored. The content of this storage means 14 and the content of a time counting means 15 counting the entire measuring time from the start of measurement are displayed in a display device 17 through the intermediary of a display control means 16. |
