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PS081 Datasheet(PDF) 25 Page - ams AG

Part # PS081
Description  Single Chip Solution for Strain Gauges
PDF  155 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

PS081 Datasheet(HTML) 25 Page - ams AG

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acam-messelectronic gmbh - Friedrich-List-Str.4 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de
3-2
1
PSØ81
3
Converter Front End
3.1
Overview
Figure 3.1 Overview
The PICOSTRAIN based converter has the strain gage ports (SG_Ax to SG_Dx) to measure:
ƒ 4 independent half bridges (quattro mode)
ƒ 2 half bridges that form a full bridge
ƒ 2 independent half bridges
ƒ 1 classical Wheatstone bridge
ƒ 1 single half bridge
3.2
Measurement Principle
The strain itself is measured by means of discharge time measurements. The discharge time is
defined by the strain gauge resistance and the capacitor Cload. Both, the strain gage with positive
change and the one with negative change are measured. The ratio of the two discharge times provi-
des the strain information. The precision of the time measurement is done with about 15 ps resoluti-
on (0.5 ps with averaging).
Figure 3.2 Measurement Principle
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