Campbell Scientific CR3000 CR3000 Micrologger - Page 166
Two-Point Slope Only Option 3
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Section 7. Installation 7.8.1.5.5 Two-Point Slope Only (Option 3) Some measurement applications do not require determination of offset. Wave form analysis, for example, may only require relative data to characterize change. Case: A soil-water sensor is to be used to detect a pulse of water moving through soil. To adjust the sensitivity of the sensor, two soil samples, with volumetric water contents of 10% and 35%, will provide two known points. The following procedure sets the sensitivity of a simulated soil water-content sensor. 1. CRBasic example FieldCal Multiplier-Only Demonstration Program (p. 166) to the CR3000. 2. To simulate the soil-water sensor, place a jumper wire between channels VX1 and SE6 (3L). 3. Simulate deployment-calibration conditions (output @ 10% = 175 mV, output @ 35% = 700 mV) in two stages. a. Set variable mV to 175. Set variable KnownWC to 10.0. b. Start the calibration by setting variable CalMode = 1. c. When CalMode increments to 3, set variable mV to 700. Set variable KnownWC to 35. d. Resume the calibration by setting variable CalMode = 4 4. When variable CalMode increments to 6, the calibration is complete. Calibrated multiplier is 0.0476. CRBasic Example 30. FieldCal() Multiplier‐Only Demonstration Program 'Jumper VX1 to SE6(3L) to simulate a sensor Public mV Public KnownWC Public CalMode 'Excitation mV Output 'Known Water Content 'Calibration Trigger Public Multiplier Public Offset Public RelH2OContent 'Sensitivity 'Offset (Starts at zero, not changed) 'Relative Water Content 'Data Storage Output of Calibration Data ─ stored whenever a calibration occurs DataTable(CalHist,NewFieldCal,200) SampleFieldCal EndTable BeginProg Multiplier = 1 Offset = 0 KnownWC = 0 LoadFieldCal(true) 'Load the CAL File, if possible 166
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