Campbell-scientific CR3000 Micrologger Manuel d'utilisateur Page 268

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Vue de la page 267
Section 7. Installation
268
Figure 83: PT100 in four-wire full-bridge
CRBasicExample61. PT100inFourWireFullBridge
'See FIGURE. PT100 in Four-Wire Full-Bridge (p. 268) 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,mV50,1,Vx1,1,5000,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
7.8.18.2.5 PT100s with Current Excitation
Example Shows:
How to measure multiple PRTs with current excitation.
Advantages:
Higher accuracy. Common excitation errors for all sensors in a series, which
results in smaller differential errors.
Uses only one differential channel per PRT.
Disadvantages:
If one series connection breaks, all sensors in the series will fail.
Vue de la page 267
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