Accession Number : ADA181641

Title :   An Improved Strain Gauge Transducer Amplifier for Wind Tunnel Use,

Corporate Author : AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s) : Pollock,N

PDF Url : ADA181641

Report Date : Aug 1986

Pagination or Media Count : 31

Abstract : An AC excited self-balancing instrument for measuring low level strain gauge transducer outputs is described. The design of a specific circuit optimised for use with a small wind tunnel force balances is presented with sufficient information to facilitate circuit optimisation for other applications. The instrument is intended for applications where the bridge output voltage is below the level that can be conveniently handled by conventional DC amplifier systems. Tests on a prototype instrument showed an input noise in a 0 .1 Hz t 0.7 Hz bandwith of 4 nV RMS, a zero drift of less than 0.1 microV per day and negligible sensitivity drifts. Keywords. Strain, Measuring, Instruments, Amplifiers, Wind tunnels, Strain gages.

Descriptors :   *STRAIN GAGES, *TRANSDUCERS, AMPLIFIERS, BRIDGES, CIRCUITS, DRIFT, INPUT, INSTRUMENTATION, NOISE, OUTPUT, PROTOTYPES, SENSITIVITY, VOLTAGE, WIND TUNNELS, ALTERNATING CURRENT, CURRENT AMPLIFIERS, WIND TUNNEL MODELS, BALANCES

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods
      Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE