Campbell Scientific CS616 CS616 and CS625 Water Content Reflectometers - Page 18

CS616 and CS625 Water Content Reflectometers 'CR200(X) program to read 4 CS625s 'Standard calibration is used to convert CS625 output 'period to volumetric water content. 'Sensors are read hourly and average water content are written to storage every 4 hours. 'Declare Variables Public period(4),vwc(4) Dim i 'Declare Constants Const a0=-0.0663 Const a1=-0.0063 Const a2=0.0007 'Define Data Tables DataTable (ofile,1,10) DataInterval (0,4,hr) Average (4,vwc,0) EndTable 'Main Program BeginProg Scan (1,hr) SWBatt (1) PeriodAvg (period(1),1,0,10,10,C1,1,0) PeriodAvg (period(2),2,0,10,10,C1,1,0) PeriodAvg (period(3),3,0,10,10,C1,1,0) PeriodAvg (period(4),4,0,10,10,C1,1,0) For i=1 To 4 vwc(i) = a0 + a1*period(i) + a2*period(i)^2 Next i CallTable ofile NextScan EndProg 6.4.3.2 CS625 Sample Program 2 Measure temperature with 109 probe and use the 109 temperature to correct the period for 1 CS625. Use standard calibration equation to convert temperaturecorrected period to volumetric water content. Sensors are read hourly and average water content and temperature are written to storage every 4 hours. CS625 leads CR200(X) green Single-Ended Channel 1 (SE1) black ground for SE1 orange Control Port 1 (C1) red SW Battery clear G 109 leads CR200(X) black Switched excitation channel 1 (EX1) red Single-Ended Channel 5 (SE5) purple G clear G 12