If I need to measure a voltage from 0 to 3 Voltage range and I need that the accuracy get to 0.001V, what kind of DAQ card I need? 12 bit? 8 bit or 24 bit? why? Thanks!

[AAA888]

If I need to measure a voltage from 0 to 3 Voltage range and I need that the accuracy get to 0.001V, what kind of DAQ card I need? 12 bit? 8 bit or 24 bit? why? Thanks!

[F._Schubert]

Resolution:

You take the range, e.g. -5V..+5V = 10V and divide it by the bit-resolution 2^bits-1 to obtain the voltage resolution.

Accuracy is a bit different, as you'll need to take into account other factors such as the long-term drift after calibration, input noise, temperature dependency (and your temperature range in the fab/lab enviornment)...

Try to calculate the necessary resolution in bits and then consult the data sheets (specifications) for the accuracy. They provide you the details how to calculate the accuracy.

Felix

[AAA888]

Thanks!