• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 47 subscribers
  • Views 255 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.

INA238: big messure error

Zhiwen Zhang
Prodigy 30 points

Part Number: INA238
Other Parts Discussed in Thread: INA228

Tool/software:

i have tested the current from 10A--80A these days. There is a gain error, so i have to calibriet it with a proportion factor. see my data in forum:   INA238: error by 0-10A

what is the meaning of High-Precision sensor?  this sensor is not accurate at all!  even if i calibriet it!

so dont use the words High-Precision!

can the error be smaller than 100 mA?
Pls tell me another current sensor, maximal current 90A, use I2C Interface.

Zhiwen Zhang

  • 0
    TI__Mastermind 28805 points

    Hello Zhiwen,

    If you are having problems even after calibration, then there may be a hardware related issue causing the current measurement to be off. I recommend measuring the voltage right at the IN+ and IN- pins of the device to make sure they are the voltage you expect. 

    If you are wanting a more precise sensor than the INA238, then you may be interested in the INA228.

    I recommend using our error tool to estimate the expected system error for your setup. That can be found here: https://www.ti.com/tool/download/CS-AMPLIFIER-ERROR-TOOL. With this tool, you can easily compare the INA238 to the INA228 to see which one should be better for your requirements.

    Regards,

    Mitch