Observing and Recording Leaf Gas Exchange
CIRAS-2 Operator's Manual Version 2.04
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more of the calculated physiological variables. In the sample screen (above) the currently active plot is Cd
(black) with the Y-axis scale set to +5 to -50, to capture both respiration (positive differentials) and
photosynthesis (negative differentials).
To include additional information about your experiment or treatment click the T button and enter the
information by selecting a particular “Treatment” associated with the measurement.
To end measurements, press the Stop button. The following will be displayed:
Click Yes to terminate measurements.
Keypress Recording
For many leaf gas exchange measurements, such as those made in the field and under dynamic light
conditions, this method of recording is most practical. Using this method you can record measurements in
rapid succession with either the thumb record switch on the cuvette handle or by clicking the Single
button in the CIRAS-2 Recording Mode screen. To begin manually recording data, click in the circle next
to „Key Press‟ and then click OK.
In Keypress Recording mode the appearance of data markers in the Time Plot is different depending on
the source of the record: in the image below the first 3 records (circles with a vertical hash line) on the
plots, were taken by clicking Single – the next 3 records (boxes) were taken with the thumb record switch
on the PLC6(U) cuvette.
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