Campbell Scientific CR850 CR800 and CR850 Measurement and Control Systems - Page 160
CRBasic Example 29., FieldCal Multiplier and Offset Demonstration Program
View all Campbell Scientific CR850 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 160 highlights
Section 7. Installation 1. Send the program in CRBasic example FieldCal Multiplier and Offset Demonstration Program (p. 160) to the CR800. 2. To simulate the flow sensor, place a jumper wire between channels VX1/EX1 and SE6 (3L). 3. Simulate deployment-calibration conditions (output @ 30 l/s = 300 mV, output @ 10 l/s = 550 mV) in two stages. a. Set variable SignalmV to 300. Set variable KnownFlow to 30.0. b. Start the deployment calibration by setting variable CalMode = 1. c. When CalMode increments to 3, set variable SignalmV to 550. Set variable KnownFlow to 10. d. Resume the deployment calibration by setting variable CalMode = 4 4. When variable CalMode increments to 6, the deployment calibration is complete. Calibrated multiplier is -0.08. Calibrated offset is 53.978. 5. To continue this example, simulate a two-stage, 7-day service calibration wherein both multiplier and offset drift (output @ 30 l/s = 285 mV, output @ 10 l/s = 522 mV). a. Set variable SignalmV to 285. Set variable KnownFlow to 30.0. b. Start the 7-day, service calibration by setting variable CalMode = 1. c. When CalMode increments to 3, set variable SignalmV to 522. Set variable KnownFlow to 10. d. Resume the 7-day service calibration by setting variable CalMode = 4 6. When variable CalMode increments to 6, the 7-day, service calibration is complete. Calibrated multiplier is -0.0842. Calibrated offset is 53.896. CRBasic Example 29. FieldCal() Multiplier and Offset Demonstration Program 'Jumper VX1/EX1 to SE6(3L) to simulate a sensor Public SignalmV Public KnownFlow Public CalMode 'Excitation mV output 'Known water flow 'Calibration trigger Public Multiplier Public Offset Public WaterFlow 'Sensitivity 'Offset (starts at zero, not changed) 'Water flow 'Data Storage Output of Calibration Data ─ stored whenever a calibration occurs DataTable(CalHist,NewFieldCal,200) SampleFieldCal EndTable BeginProg Multiplier = 1 Offset = 0 LoadFieldCal(true) 'Load the CAL File, if possible 160