CN0325 +/- 20mA input measurement

Hi,

I am planning to use CN0325 for universal analog input type board. I have query about  +/- 20mA analog current measurement circuit path. I did not found any shunt resistor in circuit for the current measurement. What is measurement path of circuit for +/-20mA input.

Thanks and Regards,

Swaminath 

Parents
  • Hi Swaminath,

    I was reading the circuit note for this, and there is a section of the document that talks about how to connect up the current input.  Here is what the text says in the document:

    "The P10 connector is used for voltage and current input connections. This allows differential inputs in the ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, 0 mA to20 mA, 4 mA to 20 mA, and ±20 mA. Connect voltage or current inputs between V1+ and V1− (see Figure 13). For current inputs, also short V1+ and I1 pins together, thereby connecting a 249 Ω precision current sensing resistor with 0.1% accuracy and 0.25 W rating."

    Here is a link to the document for your reference, I hope you find this helpful.(https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0325.pdf )

    Cheers,

    Brandon

Reply
  • Hi Swaminath,

    I was reading the circuit note for this, and there is a section of the document that talks about how to connect up the current input.  Here is what the text says in the document:

    "The P10 connector is used for voltage and current input connections. This allows differential inputs in the ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, 0 mA to20 mA, 4 mA to 20 mA, and ±20 mA. Connect voltage or current inputs between V1+ and V1− (see Figure 13). For current inputs, also short V1+ and I1 pins together, thereby connecting a 249 Ω precision current sensing resistor with 0.1% accuracy and 0.25 W rating."

    Here is a link to the document for your reference, I hope you find this helpful.(https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0325.pdf )

    Cheers,

    Brandon

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