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Current Shunt Monitor

Alexandre Imbeault
Prodigy 100 points
Other Parts Discussed in Thread: INA193, INA214

Hello, I'm looking for a way to measure a current from -300A to 300A. I want to use a current shunt monitor like the INA193 that will read the voltage drop across a shunt resistor. If I supply it with 5V, my output should be from 0V to 5V and match with -300A to 300A. So, a reading of 2,5V should mean that there is no current flowing through the resistor. Right ?

My question is, what happen if I use it on low-side instead of high-side ? And how do I evaluate the total error on measurement ?

Thank you

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    TI__Mastermind 25865 points

    Hello Alexandre,

    It appears as though you posted this question in multiple forums.  This post, however, mentions the INA193 instead of the INA214. 

    For this application I would use the INA21x family of devices per the other post.  There is also a discussion in the other post about calculating the error of the measurement.  It only includes initial input offset voltage and CMRR, but you can use the principles to incorporate the other errors.

    If your system can tolerate the small shunt voltage between the load and ground you should be fine with a low-side measurement.  High-side measurements can detect load shorts, but that may not be an issue with your application.