Strain gauge amplifiers
When studying strain gauge amplifiers, you would be required to gather information on the concept of strain gauge and the concept of stress and strain. When external forces are applied to a stationary object, stress and strain is caused. Stress is described as the material’s internal resisting forces, where as strain is described as the displacement and deformation that take place. Strain is described as the quantity of deformation per unit length of a material when a load is put on. Usual values for strain are not more than 0.005 inch/inch and are frequently explained in micro-strain units.
The strain gauge transducer amplifier can provides a wide range of signal conditioning for strain gauges, load cells, pressure and torque transducers. The transducer has sensitivities which can be measured between 0.1mV/V and 30mV/V and are accommodated by a combination of DIL switch settings and a fine trim potentiometer. The transducers can be offered in certain arrangements that can provided "zero" errors and can be used to offset the reading by up to +/- 79% of full scale.
The strain gauge amplifiers has a wide frequency response is offered; typically DC to 5KHz. There is an on-board low pass filter which can be switched in to reduce high frequency fluctuations or induced electrical noise, to give stable readings under adverse conditions. If you desire, you can achieve a wide range of output options for current and uni-polar or bi-polar voltage, simply by configuring the DIL switch settings.
Most strain gauge amplifiers are available in both the AC and DC versions. Also they can be mounted in a light gray ABS case sealed to IP65 standard.
The perfect strain gauge would change resistance only due to the deformations of the surface to which the sensor is attached. On the other hand, there are other things that affect the detected resistance such as heat, objects characteristics, the bonding agent that attaches the gauge to the surface, and the strength of the metal. For the reason that nearly all objects do not have the identical properties in all directions, understanding of the axial strain only is inadequate for a comprehensive study. Poisson, bending, and torsional strains also require to be calculated. Each needs different strain gauge amplifiers.
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