Campbell-scientific CR3000 Micrologger Manuel d'utilisateur Page 258

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Section 7. Installation
258
'Declare Event Driven Data Table
DataTable(Event,True,1000)
DataEvent(0,DeltaT_C>=3,DeltaT_C<3,0)
Sample(1,PTemp_C, FP2)
Sample(1,AirTemp_C, FP2)
Sample(1,DeltaT_C, FP2)
EndTable
'Declare Time Driven Data Table
DataTable(OneMin,True,-1)
DataInterval(0,1,Min,10)
Sample(1,EventCounter, FP2)
EndTable
BeginProg
Scan(1,Sec,1,0)
'Wiring Panel Temperature
PanelTemp(PTemp_C,_60Hz)
'Type T Thermocouple measurements:
TCDiff(AirTemp_C,1,mV20C,1,TypeT,PTemp_C,True,0,_60Hz,1,0)
'Calculate the difference between air and panel temps
DeltaT_C = AirTemp_C - PTemp_C
'Update Event Counter (uses special syntax Event.EventCount(1,1))
EventCounter = Event.EventCount(1,1)
'Call data table(s)
CallTable(Event)
CallTable(OneMin)
NextScan
EndProg
7.8.18 PRT Measurement
PRTs (platinum resistance thermometers) are high-accuracy resistive devices used
in measuring temperature.
7.8.18.1 PRT Calculation Standards
Two CR3000 instructions are provided to facilitate PRT measurement.
PRT():anobsoleteinstruction.ItcalculatestemperaturefromRTD
resistanceusingDINstandard43760.Itissupersededinprobablyall
casesbyPRTCalc().
PRTCalc():calculatestemperaturefromRTDresistanceaccordingtoone
ofseveralsupportedstandards.PRTCalc()supersedesPRT()inprobably
allcases.
For industrial grade RTDs, the relationship between temperature and resistance is
characterized by the Callendar-Van Dusen (CVD) equation. Coefficients for
different sensor types are given in published standards or by the manufacturers for
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