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771—W双光路全差示比色计是根据最精密法原理设计的测定高含量钨的专用仪器。最精密法采用两个参比溶液使标尺向左右扩展,以提高测量精度,但操作时标尺左右两端点互相牵制以及其他原因很少见诸实际应用。771—W比色计是用一个外加的可调微电流代替一个溶液参比,使标尺向左扩
771-W dual optical full-color display is based on the principle of the most accurate method for the determination of high-content tungsten special equipment. The most sophisticated method uses two reference solutions to extend the scale to the left and right to improve measurement accuracy, but the two ends of the scale around each other during the operation and other reasons rarely seen in practical applications. 771-W colorimeter is an additional adjustable micro-current instead of a solution reference to make the scale to the left