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3. Methodology

3.1 Selection of Alternative Signal Conditioners

3.1.1 Selection of Potential Alternative Signal Conditioners for In-Lab Testing

The two target laboratories, strain and pressure measurement laboratory, and vibration

measurement laboratory, use the same set up for strain measurement. The hardware set-up

includes a signal conditioner unit that supplies excitation voltage and amplifies output signal

from the Wheatstone bridge. The amplified signal is converted to digital signal by the A/D

converter, and then processed by software installed on a computer. Currently, NI6229, a 16 bit

DAQ instrument is used for the conversion, and LabVIEW program is used for data processing.

Figure 1 shows the system schematic of the strain measurement set-up.

Figure 1 System Schematic of Strain Measurement Set-up

The resolution of the experiments is determined by the signal conditioner gain setting,

A/D converter’s resolution, and its range. The range can be configured LabVIEW DAQ assistant

module. Since the resolution of an A/D converter of N bit is given by expression:







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where N, the effective bit is 1.5 bit less than total bit.

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Vishay 2310 Guía de usuario Pagina 17