• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 452 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

INA226 variation of gain

na na78
Guru 16770 points
Other Parts Discussed in Thread: INA226

Hi

We are attempting to measure the load current of 1A when the shunt resister is 1mOhm but we get 960mA as the measurement result.

(The load current of 1A is measured by current probe)

Do you have information about the variation of gain according to the shunt resister (1mOhm)?

Or, is there a possibility that the poor routing causes such a measurement error?

(e.g. Sense/Shunt resister is connected to via)

regards

  • 0
    TI__Mastermind 32700 points
    Hello,

    With the INA226 there is a gain error of 0.1% and a VOS of 10uV. In this case of 1mV at the input the 10uV will could account for a 1% error. The resistor tolerance is also an important part of this as the gain error can vary as much as the resistor tolerance. What is the resistor error?

    Most likely this is a layout issue. Is there anyway you could send my a schematic and a picture of the layout? You can email me at j-contreras@ti.com

    Regards,
    Javier