FP-AI-111 with 0-1mA inputs?

[865-671-5400]

We need to connect several existing transmission line voltage meters with 0-1mA current loop outputs to our FP-AI-111, however, it is looking for 0-20mA, or 4-20mA.

Does NI have a module better suited for 0-1mA inputs?

[Wayne.C]

If you need more resolution, you may need to use a voltage input module and measure voltage across a shunt resistor placed in the current loop.  That is exactly what the current input module is doing.  Do you know the maximum loop resistance the existing transmission line voltage meters can drive?

[Ching_F.]

Hello,

All of our FP-AI modules have current inputs of 0-20mA, 4-20mA, and/or +/-20mA.  We do not have a module that is in the range of 0-1mA. 

Please let me know if there is anything else I can do for you.

[865-671-5400]

Thank you. Max resistance the 0-1mA outputs can drive is 1K.

 Yes, resolution is our concern with connecting a max of 1 mA into the 0-20 input of the FP-AI-111. That's only 5% of the AI's range.

[Wayne.C]

With 1K precision series resistor you would generate 0-1V signal.  AI-112 just happens to have a 0-1V input range. 

[865-671-5400]

Bingo!

Thank you very much, that sounds like the way to go.