CR1000 Manual - Campbell Scientific

Section 7. Installation
Figure 81: PT100 in four-wire full-bridge
CRBasic Example 61.
PT100 in Four‐Wire Full‐Bridge
'See FIGURE. PT100 in Four-Wire Full-Bridge (p. 263) for wiring diagram.
Public BrFullOut
Public Rs_Ro
Public Deg_C
BeginProg
Scan(1,Sec,0,0)
'BrFull(Dst,Reps,Range,DfChan,Vx1,MPS,Ex,RevEx,RevDf,Settle,Integ,Mult,Offset)
BrFull(BrFullOut,1,mV25,1,Vx1,1,2500,True,True,0,250,.001,.02344)
'BrTrans = Rf*(X/(1-X))
Rs_Ro = 50 * (BrFullOut/(1 - BrFullOut))
'PRTCalc(Destination,Reps,Source,PRTType,Mult,Offset)
PRTCalc(Deg_C,1,Rs_Ro,2,1.0,0)
NextScan
EndProg
7.8.19 Running Average
The AvgRun() instruction calculates a running average of a measurement or
calculated value. A running average is the average of the last N values where N is
the number of values, as expressed in figure Running-Average Equation (p. 263),
Figure 82: Running-average equation
263