CIRAS-3 Operation Manual V. 1.09 147 support@ppsystems.com
Do I Use Linear versus Quadratic
The CIRAS-3 system automatically collects data based on both a linear or quadratic fit for the assimilation
data. In the past quadratic fitting was most popular but at the request of some customers we have now
also introduced a linear fitting. As discussed in the theory section, on theoretical grounds, the relationship
is likely to deviate from a linear response, especially at high assimilation rates. Generally speaking, if
your rates are low we recommend using the linear fit. For most measurements with higher rates the
quadratic fit is normally recommended.
Closed System Operation
Many of the features related to closed system measurement screens (numerical and graphical
presentation of data, graph set, recording measurements, etc.) are similar to what has already been
discussed in this operation manual. The displays are also similar when using the SRC-1 / SRC-2 Soil
Respiration Chamber or CPY-4 / CPY-5 Canopy Assimilation Chamber.
Numerical Data Display (SRC-1 and SRC-2)
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