AN 17 - Calibration Routine for Picarro Water Isotope Analyzers

Since the Picarro analyzer is extremely linear, it is only necessary to use three calibration standards across the intended span of isotope values to calibrate each isotope ratio (two points define the calibration line, and a third intermediate point is used for verification). The exact value of each calibration standards is not of particular importance as long as they span a representative range of values over which the analyzer will typically be operated. (Although it is not necessary to use more than three standards, additional standards can be used to further constrain the linear calibration coefficients.)