| 摘要 |
PURPOSE:To facilitate the generation of a warning and the viewing of the level state of the current signal by setting a threshold value in a CPU. CONSTITUTION:When an input signal current passed through a meter relay is supplied to terminals 9 and 10 of an insulating type current/voltage converting circuit 1, a voltage corresponding to a magneto-electric converting element 12 is generated and applied to and A/D converter 2 through a differential amplifier 13, so that the conversion output is stored in a memory 3 by the muCPU14. The low-level and high-level values in the memory 3 are read out to turn on corresponding LEDs 6. Further, the input signal is compared with the high level and low level and a warning circuit 8 is put in operation unless the signal is within the range. |
