In this paper some interesting and unexpected features of unconventionally supplied a four-terminal (4T) bridge network are presented. DC current source is switched in parallel to opposite arms supply this circuit which can contain the differential sensor (connected in neighbor arms). This circuit of two simultaneous outputs from the both bridge diagonals is named as double current (2J) bridge. The output voltages are different functions of arm resistance increments and their values are given in absolute and relative units. As the example of application circuit with two sensors acting simultaneously as strain gauge and as RTD’s is proposed. Signal conditioning formulas of two-parameter measurement of strain and temperature are discussed in detail. Some results obtained with the use of this bridge circuit are briefly described. This new type DC bridge is dedicated as the input analogue conditioning circuit of all type resistance sensors used in measurement and diagnostic systems applied in industry and other fields including gas and petrol installations.
Ключові слова: bridge circuits, strain and temperature measurement, two-variable circuits
Unconventional Double Output Bridge for Simultaneous Measurement of Two Parameters,
Information Processing Systems,