10-82
Using the LI-8150 Multiplexer
Dead Band requirement changes depending upon the chamber geometry, system
flow rate, and collar and site characteristics. Testing at LI-COR has indicated that a
Dead Band between 10 and 60 seconds generally provides for adequate mixing
(30 seconds is a good starting point if you are new to the system). There may be
conditions, however, where a longer Dead Band is required. Note, too, that
collected data can be recomputed using longer (or shorter) Dead Bands with the
LI-8100A File Viewer program (if Raw records are collected).
Tap Maximum Time to set the Dead Band
to the maximum time of 999 seconds, or
Minimum Time to set the Dead Band to
the minimum time of 0 seconds.
Pre-purge
When making repeated observations, a delay is required to allow the chamber air
to return to ambient conditions before beginning the next observation cycle. This
delay is referred to as the Pre-purge.
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