ADC Accuracy vs Precision

Status
Not open for further replies.
H

hioyo

Advanced Member level 4
Joined
Aug 18, 2021
Messages
116
Helped
0
Reputation
0
Reaction score
2
Trophy points
18
Activity points
899
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.
 

Solution
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...
Sort by date Sort by votes
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

 
Upvote 0 Downvote
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
 
Upvote 0 Downvote
Solution
Last edited:
Reactions: hioyo

    H

    hioyo

    Points: 2
    Helpful Answer Positive Rating
Upvote 0 Downvote
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
 

Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…