Hi,
I'd like to have further details regarding the 0.01% FSR max nonlinearirty of the ISO124.
How to assess it ? What does it represent ?
Thanks in advance.
Paulo.
Hello Paulo,
Finding the nonlinearity of a particular ISO124 unit would involve the following steps:
1) Find the transfer function for the particular unit; in other words, find the output voltage for every input voltage applied under specified conditions (in the case of the ISO124 the conditions are TA = +25°C , VS1 = VS2 = ±15V, and RL = 2kΩ).
2) Perform a minimum mean squared error straight line fit to the data measured in 1).
3) Subtract the straight line fit obtained in 2) from the voltage output measured in 1).
4) Divide the difference found in 3) by the full scale range (20 V in the case of the ISO124 under the conditions prescribed in 1), and express the result in percentage.
5) The linearity for this unit will be the maximum of the absolute value of the data found in 4).
The image below depicts an example of the results one could obtain after following steps 1) through 4).
The meaning of the 0.01% FSR max nonlinearity indicated in the datasheet is that no unit should exhibit a nonlinearity above 0.01%.
Hope this helps.
Best regards,
Jose
