FCT 80
5-32
System Software
The output resolution of X will be
∆
X = 4.88 x 10
-4
(X
F
- X
o
)
[voltage]
and
∆
X = 2.44 x 10
-4
(X
F
- X
o
)
[current].
If voltage is measured, the 0-5V range should be used whenever possible.
The 0-100 mV range is provided for measuring or logging devices with a
more limited voltage range; some resolution may be lost due to signal noise
considerations when using the smaller output range.
The output impedance of the 0-100 mV range is 50-100
Ω
, so a measuring or
logging device with a high input impedance should be used.
Note that resolution is maximized by minimizing the range to be covered.
For example, if you are making CO
2
measurements that are always less than
400 ppm, set the DAC to cover only that range, rather than 0 to 1000 or 0 to
3000.
