THREE-POSITION ELECTRIC MEASURING INSTRUMENT Russian patent published in 1998 - IPC

FIELD: measurement technology. SUBSTANCE: instrument has reference sources 1 and 2 comparators 3, 4, indication selecting unit 5, reader 6 with control circuit 7, AND gates 8-11, OR gates 12-15, pulse generator 16. Reader 6 is made in the form of set of digital indicators 22-25 each incorporating two radiation-spectrum control inputs 30-33 and 26-29. During warms-up period, indicators glow yellow; when in operating mode, with comparators not operating, they are green; when one of comparators operates, respective digits glow red. EFFECT: provision for supplying operator with full information about instrument mode of operation without using additional indicating components. 1 dwg