Section 3. Taking Measurements
3-3
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Avoid clamping onto the veins of the leaf. The
uneven surface may prevent the aperture clamp from
properly sealing. If in auto-mode, the instrument
may not take the measurement. If in manual mode,
the logged measurement may be inaccurate.
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Fully fill the aperture with the leaf. To get reli-
able stomatal conductance readings, the chamber
must be completely covered and sealed. When using
an LI-600 equipped with a fluorometer, fluorescence
readings can be taken without filling the aperture.
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Maintain unblocked vents on the instrument.
Do not cover any of the vents on the instrument
when taking measurements.
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Turn GPS off when not in use. GPS uses more
power when it is searching for satellites. If you're
indoors or in an area with poor satellite fix, turn off
GPS to save battery power. GPS can be turned off on
the instrument by going to Settings (left arrow from
Select Configuration), or can be turned off in a con-
figuration by leaving "Use GPSand Leaf Angle"
unchecked in the General screen in Configuration
Management.
Caution: Do not apply pressure to the aperture
clamp to achieve a seal on the leaf. This can warp the
aperture clamp, interfere with the instrument’s
optics, and produce measurement errors.
Taking a measurement
The workflow for taking a measurement on the LI-600
will vary depending on two settings in the active con-
figuration: whether the measurements are taken in
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