Omega I Series User Manual page 29

Accuracy of Analog Output board is +/-1% of FS (Full Scale) when following
conditions are satisfied:
1. The input is not scaled below 1% of Input FS (10 mV @ 1 V or 0.2 mA @
20 mA input ranges).
2. Analog Output is not scaled below 3% of Output FS (300 mV @ 10 V or
0.6 mA @ 20 mA output ranges).
Otherwise certain corrections need to be applied.
For example:
For entire range of process input, the Analog Output on 10 V FS scaled for
300 mV output range:
Rd1 = 0000, Out1 = 00.00
RD2 = 9999, Out2 = 00.30
The measured output will be as follows:
Rd1 = 0000, Out1 = -0.07 V
Rd2 = 9999, Out2 = 0.23 V
This means that for 300 mV output range we have -70 mV offset at zero and at
full scale. In order to compensate this 70 mV offset the correct scaling will be
as follows:
Rd1 = 0000, Out1 = 00.07
Rd2 = 9999, Out2 = 00.37
The above corrections need to be applied only for Input scaled below 1% of FS
and Output scaled below 3% of FS or if you need the Analog Output
accuracy to be better than 1% of FS.
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