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Minimum Voltage and Current readings


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#1 Loz

Loz
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Posted 25 October 2012 - 04:27 AM

Does anyone know how accurate the U6 is at low voltage and current ranges? I have a requirement to read as low as 20 milli amps. Or if I put this through a resistor I could read +-20uA. But looking at the specifications I cannot see what the accuracy would be at these sorts of levels. Any help appreciated. Thanks.

#2 LabJack Support

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Posted 25 October 2012 - 07:51 AM

Appendix A says that the U6 is tested to +/-0.01% absolute accuracy on the +/-100mV range. That means +/-20uV:

http://labjack.com/s...uide/appendix-a

Consider that since you are usually doing some sort of system calibration to account for all errors (sensor error, shunt error, U6 AIN error, etc.), the resolution is often more of interest than accuracy:

http://labjack.com/s...on-and-accuracy

http://labjack.com/s...uide/appendix-b

Here is a section about measuring current:

http://labjack.com/s...s-guide/2.6.3.7

If you use a shunt, consider putting it on the low-side to avoid common-mode voltage issues:

http://labjack.com/s...l-analog-inputs


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