Frequently Asked Questions
In this FAQ section you will find short articles written by our support staff that can help you answer questions we often receive from our customers. The content can be accessed using the Search function
Deployment
- Calculating weight and buoyancy
- Is Z always up relative to the earth (independent of the ADCP orientation), or does it just point up the ADCP tube?
- What is the minimum horizontal magnetic field strength that an AquaPro can use?
- Do you have experience in reservoir studies using AWACs and do you have any input regarding this application?
- For how long can batteries be stored before use?
- Do you have any recommendations on how to clean the instruments and how to prevent growth (biofouling)?
Ocean Currents
- How to calculate current speed and direction from ADCP velocity components
- How much tension should I use when tightning screws on the endbell?
- Does the fourth beam on the AWAC measure along-beam velocity also?
- What is the maximum horizontal profiling range for a 2D profiler?
- What is the maximum configurable baud rate for Signatures?
- How do I change the orientation on my Signature from horizontal to vertical?
Ocean Waves
- What is the Wave Velocity Cell and how is it used?
- What is the effect of temperature gradients when estimating the surface level?
- What effect does the "mounting height" selection have in the deployment planning?
- Does White capping cause problems for the AST beam?
- What should I put in the "Waves - static mode" edit boxes (AWAC deployment planning panel)
- Is there a lag between the sampling time of pressure and velocity measurements in the Aquadopp/AquaPro when used in wave mode?
Software
- How does adjustable transmit power work?
- The binary to ASCII data conversion is not working. What is the problem?
- My instrument is not communicating. What should I do next?
- How can I download data from my Signature?
- How can we get the Nortek standard control software to start-up automatically?
- How does the AWAC estimate ice thickness?
Subsea Navigation
System Integration
- I want to develop my own application to be used with a Nortek instrument. Can you provide me with some information to get me started?
- How to sync the Signature clock over Ethernet (PTP or NTP)?
- What is the maximum number of files on the recorder?
- What should typical power drain be?
- What are the hex and binary data conventions?
Velocimeters
- Does the Vectrino flag bad data?
- The Vectrino probe is not recognized. What is the problem?
- What does the accuracy specification mean?
- How do I synchronize Vectrinos?
- How do you figure out the time to assign to Vector velocity samples?
- How is a Coordinate transformation done?
Vessel-mounted Systems
- What FFT method is used in Storm?
- How do I calibrate my vessel mounted AWAC?
- Where does the AWAC VM get time/date information from?
- Can I use my AWAC for moving boat application?
- How should I mount the VM system?
- Why do I see a high Vertical Velocity?