Campbell Scientific CR3000 Micrologger - Manual (Page 165)

Section 7. Installation
165
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 to SE6(3L) to simulate a sensor
Public SignalmV 'Excitation mV output
Public KnownFlow 'Known water flow
Public CalMode 'Calibration trigger
Public Multiplier 'Sensitivity
Public Offset 'Offset (starts at zero, not changed)
Public WaterFlow '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
Scan (100,mSec,0,0)
'Simulate measurement by exciting channel VX1/EX1
ExciteV (Vx1,SignalmV,0)
'Make the calibrated measurement
VoltSE (WaterFlow,1,mV5000,6,1,0,250,Multiplier,Offset)
'Perform a calibration if CalMode = 1
FieldCal (2,WaterFlow,1,Multiplier,Offset,CalMode,KnownFlow,1,30)
'If there was a calibration, store it into a data table
CallTable (CalHist)
NextScan
EndProg