Current measurement accuracy


#1

Hello, our company primarily works on devices with consumption in range with 1 uA — 20 uA.
Will Otti be suitable for such an application?
What is the accuracy in this range? The main page says 1 uA, but spec page says 19 mA ±1%, wich is ±190 uA ??
What is the resolution on this range?

BTW, https://www.qoitech.com/contact page is not working.


#2

Hi Gordon,

Yes, Otii will definitively be suitable for your application.
The accuracy, according to the datasheet, is ±(1% + 0.5 µA) but actually it is much better than this.
In the range 1-19mA, the ADC step size is 5nA and the offset error is usually lower than 100nA.
I did a test on my Otii here at my desk, and the error, at 188uA, was less than 0.02% (28nA).
Remember to do an offset calibration before you do accurate measurements.

Regarding our contact page, strange. I tried it without any problems.
Thanks for reporting this to us.

Best regards,
Björn


#3

Thank you for quick responce!
I think, we will try Otii )