PS081 datasheet(24/155 Pages) AMSCO

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3-1

PSØ81

Table of Contents

Page

Converter Front End .......................................................................... 3-2

3.1

Overview.................................................................................................................................................3-2

3.2

Measurement Principle ............................................................................................................................3-2

3.3

Connecting the Strain Gauges ...................................................................................................................3-3

3.3.1

Half Bridge ...................................................................................................................................3-3

3.3.2

Full Bridge ....................................................................................................................................3-4

3.3.3

Full Bridge Parallel (zero drift optimized)..........................................................................................3-5

3.3.4

Full Bridge connected as Half Bridge (Current Saving Connection).......................................................3-5

3.3.5

Wheatstone Bridge .......................................................................................................................3-6

3.3.6

Quattro Bridge (4 sensors)............................................................................................................3-7

3.3.7

2 Half Bridges separately ...............................................................................................................3-8

3.3.8

6-wire Technology..........................................................................................................................3-9

3.4

Capacitor, Cycle Time, Averaging .............................................................................................................3-10

3.4.1

Load Capacitor (Cload).................................................................................................................3-10

3.4.2

Cycle Time (cytime)......................................................................................................................3-10

3.4.3

Cycle Time in Stretched Mode.......................................................................................................3-11

3.4.4

Averaging (avrate) .......................................................................................................................3-12

3.4.5

Better resolution by averaging ......................................................................................................3-12

3.4.6

Resolution and Converter Precision ...............................................................................................3-13

3.5

Modes and Timings................................................................................................................................3-15

3.5.1

Continuous Mode.........................................................................................................................3-15

3.5.2

Single Conversion Mode ...............................................................................................................3-15

3.5.3

Stretched Mode ..........................................................................................................................3-16

3.5.4

Mode Selection Criteria ...............................................................................................................3-19

3.5.5

Conversion Time / Measuring Rate (Continuous Mode).....................................................................3-20

3.5.6

Conversion Time / Measuring Rate (Single Conversion Mode) ...........................................................3-20

3.5.7

Comparator ...............................................................................................................................3-21

3.5.8

Temperature Measurement ..........................................................................................................3-23

3.6

Post-processing ....................................................................................................................................3-25

3.6.1

Off-center Correction for Quattro Scales........................................................................................3-26

3.6.2

Compensation of Load Cell Gain & Offset Drift (Mult_TKG, Mult_TkO)................................................3-26

3.6.3

Annotations Rspan ......................................................................................................................3-28

3.6.4

Nonlinearity of gain drift over temperature .....................................................................................3-29

3.6.5

Gain-Drift of PSØ81 itself – Optimization with Mult_PP ...................................................................3-31

3.6.6

Zero Drift of PS081 itself.............................................................................................................3-32

3.6.7

Mult_UB - Power Supply Rejection.................................................................................................3-34

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