Balanced Constant Current Excitation for Dynamic Strain Measurements

摘要

Balanced constant current excitation uses a pair of matched constant current sources to excite a single active strain gage. The technique provides enhanced immunity from electrostatic noise pickup and may be employed for dynamic strain measurement applications that require only two wires to the transducer. In this paper, the properties of balanced constant current excitation will be examined and compared against traditional techniques using the Wheatstone bridge or single-ended constant current excitation. A method to verify transducer health and cabling will also presented.