sampling rate: averaging interval

just a quick question about the averaging interval
In 'deployment planning':
Once the profile interval is set, (say 600 seconds)
and the averaging interval is set (say 60 seconds)
Will one point, averaged over 1 minute be recorded every 10 minutes?

what is this average?
is it an average of 60 points, taken at 1Hz or something different.
What is the sampling rate averaged for this averaging interval?

thanks in advance!
O

Hi vetter!

Yes you are absolutely right about what you assume in the first part of your posting. A profile interval set to 600 seconds and an averaging interval set to 60 seconds will result in one point averaged over 1 minute recorded every 10 minutes.

Each average has been made from a number of individual pings. Nortek instruments do not have a common ping frequency, instead the ping rate is related to the frequency of the instrument.

Example: A 2MHz Aquadopp has a ping rate of 23Hz @ 100% measurement load (i.e. measuring all the time). At 50% measurement load (i.e. measuring half the time) it will have a ping rate of half that frequency.

The default settings available in the deployment setup menu specify a 4% measurement load (i.e. measuring 4% of the time). This is a trade-off between the need for a low standard deviation and the need for a low power consumption.

The standard deviation obtained by the setting is listed in the right-most pane of the Deployment setup menu. If you find this standard deviation unacceptably low for your application you may increase the averaging interval or increase the measurement load, but alas, at the expense of increased power consumption.

- Gustav