CIRAS-3 Operation Manual V. 1.09 95 support@ppsystems.com
TIP
Prior to measurements on small leaf area or whenever you expect very low rates of photosynthesis and
when CO2d is showing a small differential (± 1-2 µmol mol
-1
), perform a manual Diff Bal (F7) to get closer
to a 0 CO2d. Typical sources for differentials in CO
2
and H
2
O are:
• Instrument not at stable operating temperature
• Leak around leaf chamber gaskets
• Exhausted chemicals (particularly the molecular sieve)
• Fluctuating CO2r
Set Clock
Press Operations (F1) > Set Clock (F3) to view the system clock. To change the date or time, highlight
the item needing to be changed and use the up and down arrows to set. Use the Tab key to move
through the selections and when finished press Accept F2.
TIP
It is very important to have the correct date and time set on the CIRAS-3 as the default data files use this
information as part of the file name. See Manual Recording on page 84
.
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