1
Set the voltage output of the LI-840A for 2.5V output and specify the zero and maximum values
for CO
2
as described in DAC Output on page3-8.
2
In the LI-1400, configure V1 channel as General for CO
2
.
3
Enter a description, such as CO
2
.
4
Set Math = Poly(nomial) and press Ent(er).
5
Set description as desired, a0 = the offset (for scaled measurements), a1 = multiplier from Table
3-1 on page3-33 (or equation 3-13), and a2-a5 = 0. When finished, press Esc to return to the
main configuration list.
6
Set Oper(ator) = none.
7
Enter a Label such as ppm for the units.
8
Set Average=1 sec or as desired. CO
2
will now be displayed on channel V1.
3-35Section 3. Operation
Section 3
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