Campbell CR800 Spécifications télécharger pdf (Page 232)

Section 8. Processing and Math Instructions

StrainCalc Example

This example uses StrainCalc to find the microstrain value of a bridge output.

' Program name: STRAIN.DLD

Public Count, ZStrain, StMeas, Strain, Flag(8) ' Declare all variables as

public

'Data Table STRAINS samples every measurement when user Sets Flag(1)

High

DataTable(STRAINS,Flag(1),-1)

DataInterval(0,0,0,100) 'Interval = Scan, 100 lapses

Sample (1,Strain,Ieee4)

EndTable

'DataTable ZERO_1 stores the "zero" measurements

DataTable(ZERO_1,Count>99,100) 'Trigger on Count 100

Average(1,ZStrain,IEEE4,0)

EndTable

'Subroutine to measure Zero, Called on first pass or when user sets Flag(2)low

Sub Zero

Count = 0 'Reset Count

Scan(10,mSec,0,100) 'Scan 100 times

BrFull(ZStrain,1,mV50,5,1,6,7,1,5000,1,0,0,100,1,0)

Count = Count + 1 'Increment Counter used By

DataTable

CallTable ZERO_1 'Zero_1 outputs on last scan

(Count=100)

Next Scan

ZStrain = ZERO_1.ZStrain_Avg(1,1) 'Set ZStrain = averaged

value

Flag(2) = True

End Sub

BeginProg

Scan(10,mSec,0,0) 'Scan 10(mSecs)

If Not Flag(2) Then Zero

BrFull(StMeas,1,mV50,5,1,6,7,1,5000,1,0,0,100,1,0)

StrainCalc(Strain,1,StMeas,ZStrain,-1,2,0)

CallTable STRAINS 'Strains outputs only when

Flag(1)=True

Next Scan

EndProg

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Campbell CR800 Spécifications Page 232