Author Topic: feeding uCurrent output to an ADC  (Read 314 times)

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Offline riforifo

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feeding uCurrent output to an ADC
« on: September 24, 2018, 11:49:42 pm »
Hello,

I use a Ref200 to generate a 100uA current source and read 99.5 mV with a multimeter.
For a quick test, I also connected the uCurrent output voltage directly with an arduino ADC.

I get varying results between 60mV and 110 mV.
I'll add an moving average algorithm but aside from software,

What are your recommendations for connecting uCurrent output to an ADC
I can try adding an amplifier in  voltage follower mode. Your recommandations are highly appreciated.

thanks

 

Offline ogden

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Re: feeding uCurrent output to an ADC
« Reply #1 on: September 24, 2018, 11:56:21 pm »
Hello,

I use a Ref200 to generate a 100uA current source and read 99.5 mV with a multimeter.
For a quick test, I also connected the uCurrent output voltage directly with an arduino ADC.

I get varying results between 60mV and 110 mV.
I'll add an moving average algorithm but aside from software,

What are your recommendations for connecting uCurrent output to an ADC
I can try adding an amplifier in  voltage follower mode. Your recommandations are highly appreciated.

thanks

Number one recommandation: match sensor output voltage range to ADC input voltage range. Only then you will have highest resolution of sensor data measurements.
 

Offline bson

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Re: feeding uCurrent output to an ADC
« Reply #2 on: September 25, 2018, 06:14:42 am »
Look for sources of noise.  The DMM will have an anti-image filter, while a naked ADC pin doesn't.
 


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