| 摘要 |
PURPOSE:To automatically perform zero/span adjustment, simplify checking and improve operativity by setting a predetermined value as a current signal and giving an instruction for starting zero/span adjustment by a setting means. CONSTITUTION:A current signal IL is set to an optional value on which a receiver REC can operate, an instruction signal S0 for starting calculation for performing automatic correction of zero/span is set from a setting device SET, and a microprocessor muP changes over a switch SW1 to a (b) contact and a switch SW2 to a (b') contact. Shipment data H0 is compared with displacement data HX (X=0) and deviation alpha is calculated based on a calculation sequence stored in a nonvolatile memory E<2>PROM. When the deviation alpha is within 0.05%, the data is stored as it is while when alpha exceeds 0.05% the data is stored in the memory E<2>PROM as corrected data H0' with alpha added to the shipment data H0 of 0%. The microprocessor muP changes over the switches SW1, SW2 to contacts (b),(a'). Shipment data H100 is compared with displacement data HX (X=100) to have a deviation beta calculated. When the deviation beta exceeds 0.5%, the data is stored in the memory E<2>PROM as corrected data H100' with a span coefficient of the shipment data H100 corrected by beta. |
