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  1. Nortek Support Center
  2. Frequently Asked Questions
  3. Principles of operation

Principles of operation

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  • Which assumptions are made during measurements with ADCP instruments?
  • What are the different coordinate systems and how are they defined?
  • Where can I find instrument software and firmware?
  • Do you have any information about the Signature AHRS?
  • How does the AquaPro HR measure currents?
  • Can you use the AquaPro HR Amplitude to estimate Suspended Sediment Concentration? What about bottom distance check?
  • What is the HR mode on the Aquadopp Profiler? What should I use the Aquadopp Profiler HR for?
  • What is a pre-Midlife/Midlife/AD2CP instrument?
  • Will my ADCP negatively affect marine animals?
  • How do I find the equivalent two-way beam angle Ψ for my echo sounder?
  • How do I calculate current speed and direction from three beam ADCP velocity components?
  • What is the wave velocity cell and how is it used?
  • What is the effect of temperature gradients when estimating the surface level?
  • Can you get velocity measurements from the fourth beam on the AWAC?
  • What is the difference between Z and Up?
  • What is sidelobe interference? Why does it occur?
  • How is wave direction defined?
  • What factors affect maximum profiling range?
  • Does the Signature series have full 3D compass and tilt readings?
  • What is the minimum velocity an ADCP can measure?
  • What are the different Doppler measurement techniques? How do they compare?
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