Campbell Scientific CR6 CR6 Measurement and Control System - Page 212
Field Calibration Keyboard Procedures
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Section 7. Installation For more information on using the calibration wizard, consult LoggerNet or RTDAQ Help. 7.9.12.4 Field Calibration Keyboard Procedures Manual field calibration through the CR1000KD Keyboard / Display is presented here to introduce the use and function of the FieldCal() and FieldCalStrain() instructions. This section is not a comprehensive treatment of field-calibration topics. The most comprehensive resource to date covering use of FieldCal() and FieldCalStrain() is RTDAQ software documentation available at www.campbellsci.com http://www.campbellsci.com. Be aware of the following precautions, • the CR6 does not check for out-of-bounds values in mode variables. • valid mode variable entries are 1 or 4. Before, during, and after calibration, one of the following codes will be stored in the CalMode variable: Table 35. FieldCal() Codes Value Returned State -1 Error in the calibration setup -2 Multiplier set to 0 or = NAN; measurement = NAN -3 Reps is set to a value other than 1 or the size of MeasureVar 0 No calibration 1 Ready to calculate (KnownVar holds the first of a two point calibration) 2 Working 3 First point done (only applicable for two point calibration) 4 Ready to calculate (KnownVar holds the second of a two point calibration) 5 Working (only applicable for two point calibration) 6 Calibration complete 7.9.12.4.1 One-Point Calibrations (zero or offset) Zero operation applies an offset of equal magnitude but opposite sign. For example, when performing a zeroing operation on a measurement of 15.3, the value -15.3 will be added to subsequent measurements. Offset operation applies an offset of equal magnitude and same sign. For example, when performing an offset operation on a measurement of 15.3, the value 15.3 will be added to subsequent measurements. See FieldCal() Zero or Tare (Opt 0) Example (p. 214) and FieldCal() Offset (Opt 1) Example (p. 216) for demonstration programs: 1. Use a separate FieldCal() instruction and variables for each sensor to be calibrated. In the CRBasic program , put the FieldCal() instruction immediately below the associated measurement instruction. 212
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