Hello. I have a question. you know, on the 3100A HFOVs I have noticed that some of them go up to higher Hz than others. The default is 15.0 Hz. I have heard some go up to 22 Hz, and the one I was fooling with went up to 15.5, and then a person I watched control went up to 17.3 which was so weird. Why is this? Has anyone ever heard of a 3100A or 3100B go up to 22Hz? Thank you, and God bless.