Observing and Recording Leaf Gas Exchange
CIRAS-2 Operator's Manual Version 2.04
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Steady Pn Options
User-defined. If checked, enter an acceptable range of variability for net photosynthetic rate.
Automatic Response
Response Curve is automatic throughout the course of measurement.
Manual Response
Response Curve is manual throughout the course of measurement. The user must manually record data
and move to the next set level during course of response curve.
PAR Type - Use Sensor
Check this box if the PAR Sensor is to be used to measure and control light in the cuvette. If this box is
not ticked, PAR must be entered manually by the user to be included in measurements.
CO
2
Control Type
Both CO2 and H2O Control Types may be changed if desired. For CO
2
response curves we recommend
using the „Supply (Ref) Approximate ppm‟ type due to the time delay associated with the precision CO
2
control option. Refer to
H
2
O Control Type
Refer to
Light Type
Defaults to „Auto. Light Unit‟. See
Temperature Control
Defaults to entered values (25 °C). See
Click
OK
to accept changes, then in the
Response Editor
save the Response file. Click
Yes
to Enter a
file name to save the Response Curve information. After entering a name, click on
Save
. Again, click
OK
when the
Select Recording Options
dialog reappears. Finally, name and save the data file. After
creating the data file, the response curve measurement will begin.
As in Timed Recording y
ou will be prompted to ‟Press “Start” when steady‟. „RL 1-30‟ indicates that your
Response Curve is currently in the first of 30 selected levels (see image above). Wait until the values are
stable at Level 1, then press the
Start
button to begin an automatic response curve measurement. You
can review details of your Response Levels at any time by clicking on the
… button in the Recording
