I'm trying to write a manual about a device that has a LED to indicate system activity. I had a discussion with a colleague regarding 'once per' vs 'once every'. To me, both seem correct without any preference.
* The LED will blink at a rate of once per second
* The LED starts blinking at a rate of once every three seconds
* Blinking once per second: starting up
* Blinking once per three seconds: start up completed
Is there a right and wrong? Is there a preferred way of putting it? Please advise.
Thanks in advance!
'Thanks in advance' now becomes 'thanks afterwards'