AUTOMATIC RANGE DEVICE FOR ALTERNATING CURRENT MEASURING INSTRUMENT

摘要: PURPOSE:To perform automatic switching to a proper level in dynamic range and preclude deterioration accuracy due nonlinear distortion, etc., by performing the when peak value of an input signal be measured exceeds permissible range. CONSTITUTION:The from source 20 is applied absolute detecting circuit 2 through 1. The output value/execution converting 3 comparator 5 A/D converter 4 compared with upper- limit lower-limit reference values comparison setting 8, so that range-down V1' or range-up V2' sent out. An detection output, on other hand, holding 6 as well, thereby generating preferential V1 upper-limit L1. When 1 switched gate 9, reset generated reset.