Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 152)

Section 7. Installation
152
calibration with new multiplier and offset factors. Only if the user creates a data-
storage output table with the SampleFieldCal() instruction will a calibration
history be recorded.
Note CAL files created by FieldCal() and FieldCalStrain() differ from files
created by the CalFile() instruction (File Management
(p. 493)
).
7.8.1.2 CRBasic Programming
Field calibration functionality is utilized through either:
• FieldCal() — the principal instruction used for non-strain gage type sensors.
For introductory purposes, use of one FieldCal() instruction and a unique set
of FieldCal() variables for each sensor to be calibrated is recommended. Use
of variable arrays is permitted for more advanced applications.
or,
• FieldCalStrain() — the principal instruction used for strain gages measuring
microstrain. Use of one FieldCalStrain() instruction and a unique set of
FieldCalStrain() variables for each sensor to be calibrated is recommended.
Use of variable arrays is permitted for more advanced applications,
each with two supporting instructions:
• LoadFieldCal() — an optional instruction that evaluates the validity of, and
loads values from a CAL file.
• SampleFieldCal — an optional data-storage output instruction that writes the
latest calibration values to a data table (not to the CAL file).
and a reserved Boolean variable:
• NewFieldCal — a reserved Boolean variable under CR800 control used to
optionally trigger a data storage output table one time after a calibration has
succeeded.
See CRBasic Editor Help for operational details on CRBasic instructions.
7.8.1.3 Calibration Wizard Overview
The LoggerNet and RTDAQ field calibration wizard steps through the calibration
process by performing the mode-variable changes and measurements
automatically. The user sets the sensor to known values and inputs those values
into the wizard.
When a program with FieldCal() instructions is running, select LoggerNet or
RTDAQ | Datalogger | Calibration Wizard to start the wizard. A list of
measurements utilized in any FieldCal() instruction in the program is shown.
For more information on using the calibration wizard, consult LoggerNet or
RTDAQ Help.
7.8.1.4 Manual Calibration Overview
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