Enable Heater
The Heater should be enabled to maintain the optical bench at a constant 50 °C.
Pressure Compensation
Enable the Pressure Compensation check box to automatically correct gas concentration values
for changes in cell pressure. In most cases this should be turned on; disabling this feature means
that no pressure correction is desired in the gas concentration calculations, which can lead to
erroneous measurements.
Filter
Shows the current value for software signal averaging. The filter can be set from 0 (no signal
averaging) to 20 seconds. Note that increasing the filter decreases instrument noise but reduces
the response time.
DAC Output
Analyzer output for up to 2 values (none, CO
2
, H
2
O mmol/mol, H
2
O °C, Cell Temperature, or
Cell Pressure) can be recorded by connecting a logging device to the terminal strip on the front
of the analyzer. Output is linear, and is selectable at 0-5V or 0-2.5V. Choose the full-scale voltage
output range and the source for DAC 1 and/or DAC 2. You can also choose a range over which
to scale the output(s); you can achieve better resolution by scaling the output(s) over a narrower
range when appropriate.
Section 3
3-8 Section 3. Operation
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