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ADC Accuracy vs Precision

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hioyo

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May I know the difference between ADC Accuracy and precession.

Can I say accuracy is a measure of how close the actual measurements to ideal measurements

and precision is the number of distinguishable ADC inputs.
 

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KlausST
Hi,

you may do in internet search "accuracy vs precision". You may find many good explanations.

In short: both are measures of multiple conversions.

let´s say your analog input is 1.000V and the digital values of lets say five values represent:
* 1.05V, 1.04V, 9.97V, 9.99V, 9.96V (average = 9.998V)
this means high accuracy. The average of the 5 conversions is very close to the target. Accuracy error just 2mV. But some value is off +50mV, the other -40mV. Thus the precision error is about +-/50mV
(good accuracy, mediocre precision)

other 5 values:
* 1.09, 1.08, 1.08, 1.08, 1.09
Here the accuracy is about 80mV off, but the precision is rather good.
(bad accuracy, good precision)

Accuracy: how close the (average) value is at the...
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precision is the repeatability of a measurement - that is, if you take many measurements, how close are they to each other.

accuracy is the correctness of a measurement - that is, if you take many measurement, how correct are they are

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Hi,

you may do in internet search "accuracy vs precision". You may find many good explanations.

In short: both are measures of multiple conversions.

let´s say your analog input is 1.000V and the digital values of lets say five values represent:
* 1.05V, 1.04V, 9.97V, 9.99V, 9.96V (average = 9.998V)
this means high accuracy. The average of the 5 conversions is very close to the target. Accuracy error just 2mV. But some value is off +50mV, the other -40mV. Thus the precision error is about +-/50mV
(good accuracy, mediocre precision)

other 5 values:
* 1.09, 1.08, 1.08, 1.08, 1.09
Here the accuracy is about 80mV off, but the precision is rather good.
(bad accuracy, good precision)

Accuracy: how close the (average) value is at the target.
precision: = repeatability. How much the values differ from one to the other.

Klaus
 
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    hioyo

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Hi,

while I like the "ametsoc" definitions ...I don´t like the "accuracy" definition in the Wikipedia page. And I miss the "precision" definition in the Wikipedia page at all.

Klaus
 

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