Pre-Amplifying low voltages with PicoLog1216

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Pre-Amplifying low voltages with PicoLog1216

Post by reindyr » Thu Jul 22, 2010 6:58 pm

Hi all,

we want to use the PicoLog1216 to measure the current of the 12V bar of a Personal Computer's power supply unit. Therefore we created a test circuit to measure the voltage on a 10mOhm resistor. A typical range of values we observed in this setting is between 2 to 4 mV of voltage.

If I got it right, the resolution of the PicoLog1216 is 12 bit over the range from 0 to 2.5V, thus the smallest unit which can be resolved is 2.5V/4096 = 0.61mV. However in our setting we want to collect finer grained values to make accurate conclusions on the current drawn by the 12V bar ( around 0.1 mV would be nice)

My question is if the PicoLog1216 can either preamplify the measured voltage or if it can distribute its resolution of 12 bit over a smaller range (e.g. measuring from 0V to 100mV with 12bit resolution.)

Thanks for help


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Re: Pre-Amplifying low voltages with PicoLog1216

Post by ziko » Mon Jul 26, 2010 10:28 am

Hi the Picolog 1216 or 1012 have a fixed range of 0 to 2.5V and as such your 12 or 10 bit range will be across the 2.5V range.

A more suited device is the ADC20/ADC24 which can take differential measurements (you can also offset your voltage to +12 V) and have higher resolution than the Picolog (at least 16 bits resolution at that range).

Hope this helps.

Technical Specialist

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