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What is the relation between Noise Density, in-run bias and drift?

Question asked by holand.daniel on Jun 7, 2012
Latest reply on Jun 21, 2012 by Harvey

Hello,
I'm confused about the terminology of in-run bias and Noise Density.
I need to know what they mean in practice.

 

 

Lets use the example of the ADIS16405.
I have tested this board over a table without moving it and I got that it rotates something about 3-4 degrees each minute. So I can say that, for my results, the DRIFT of the board is 3-4degrees per minute.

 


So far so good. Now...

That's the information of the data sheet:

Typical bandwidth (KHz): 0.33
Noise Density (°/s/rtHz): 0.05

Initial Bias Error: 3°/sec

In-Run Bias Stability: 0.007°/sec


My question is: Based on these values, how is possible to calculate the drift of the board? I want to see the math that shows me the same values that I got in my test.

 

Any help would be extremely appreciated!

 

 

Dan

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