Using the LI-8150 Multiplexer
10-63
The calibration functions for both CO
2
and H
2
O correct for pressure fluctuations
that may be present. To disable this correction, click on the Options tab and
uncheck the ‘Enable Pressure Compensation’ check box.
The LI-8100A uses a rectangular hyperbola for the CO
2
calibration, and a third
order polynomial for H
2
O calibration. The Coefficients page displays these
factory-determined calibration coefficients, as well as those for band broadening
and cross sensitivity. These coefficients are fixed at the factory, and are present on
the calibration sheet included with the instrument.
The calibration constants for CO
2
and H
2
O zero and span calibrations are found
on the Manual page. These constants are stored to a file on the computer by
clicking on Save Values. Click Load Values to restore the values in this window
using the file on the PC. If new constants are entered in this window, click Apply
to send the values to the LI-8100A for implementation; the constants are not
automatically saved to the computer until you choose Save Constants.
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