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PS081 Datasheet(PDF) 35 Page - ams AG |
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PS081 Datasheet(HTML) 35 Page - ams AG |
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35 / 155 page  acam-messelectronic gmbh - Friedrich-List-Str.4 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de 3-12 1 PSØ81 3.4.4 Averaging (avrate) The number of strain gages respectively half bridges connected defines how many discharging cycles are needed to make one complete ratio measurement: Half bridge à 2 cycles Full bridge à 4 cycles Quattro bridge à 8 cycles Figure 3.14 Discharge cycles for a complete measurement Those numbers of cycles for each mode together define 1 sample (avrate=1). This is also the mini- mum needed for one complete ratio measurement. 3.4.5 Better resolution by averaging In PS081, the resolution can be increased by internal averaging. The sample size of the averaging is specified by parameter avrate in register 2. The standard deviation of the result will be improved by nearly the square root of the sample size. The following picture shows the correlation for a full bridge: Figure 3.15 Averaging Member of the ams Group |
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