Interpretting the compass calibration plot for Nortek Aquadopp Profiler

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Alex Slonimer

• September 21, 2022 20:51

Hello, we have a Nortek Aquadopp Profiler for which we have completed a compass calibration.  From the manual ("aquadopp-profiler_Jan2008.pdf", p. 36 - 38) there is an example of a successful rotation shown, where there is a circle centered at x=0 and y=0. 

However, my plot looks nothing like this. My circle is centered at x=0.5 and y=2, with a radius of 4 counts, and the top of the circle is flattened along y=5. 
 

So I have 2 questions:
1) Is this acceptable, or should the circle be centered? Or is it okay so long as it is not ellipsoidal?
2) Is the circle actually flat at the top, or is this a result of the plot not extending  beyond y = 5 ? 
3) What do the units of counts indicate, and what does the radius signify?

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• Official comment

  

  Oddrun Christin Myklebust

  • September 22, 2022 10:56
  • Edited

  Hi Alex,

  answers to all your questions related to compass calibration should be found in the instrument manual. The latest version can be downloaded from our support site https://support.nortekgroup.com/hc/en-us/articles/360029839331-The-Comprehensive-Manual-ADCP 

  Best regards, 

  Oddrun 

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  Alex Slonimer

  • September 22, 2022 15:53

  Thank you! The older version (2018) didn't have any of these details, but it's great to see that it's present in this newer (2022) version.  

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  Oddrun Christin Myklebust

  • September 29, 2022 13:31

  Good that you found the answers you needed!

  Yes, we update our manuals several times a year - so you should always make sure that you have the latest one. 

  Wish you a great day!

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