Refuses to begin observation, when tilted too far

[Nate The Surveyor]

This was yesterday. I had tilt turned off. So, it should not be using tilt. And, I had a number of wooden fence posts to tie. I was simply leaning the LS over the post, to be at the approx middle of the post. (elevations were no concern on these shots) and, I needed to just tie them. The LS refused to begin, until it was closer to level. Maybe within 5° or so.
I'd like to turn this feature off, and I'd like to know where the point of measurement on the LS is. IS it at the top, in the middle of the antenna, or is it up above the antenna, a bit, or is it below the antenna a bit? Where is the mechanical point of measurement?
Thanks!
N

 

[Matt Johnson]

If you enter a zero antenna height, then the point of measurement is the ARP which is the bottom of the LS where the pole screws into it. It the LS is tilted then some error is introduced when tilt corrections are off even with zero antenna height because an offset between the antenna phase center (near the antenna) and ARP is being applied vertically. The easiest solution to your problem is just to collapse the rover and put it on top of the fence post so it can be leveled. You could also set the antenna height to zero with tilt corrections on and you will be measuring to the ARP.

 

[Nate The Surveyor]

Well, I had it mounted on top of a 12' Hixon Pole. (collapsed, it's about 4.5' tall) I was mostly using the bipod with it, for stability. I did think of getting a Leica Quick Release, and installing it between the pole and the LS. But, that makes pushing buttons sort of twerky... because it can now turn on the top. I don't think I will use the monopod, except for doing topo, and contour plats. I have to be able to set it down, in a working state.
My idea of deficiency (OOPS I meant efficiency), is to have everyone on the crew, fully occupied, at maximum efficiency, at all times. This now includes the LS.
Thanks for the replies. I should think about that a bit.

 

[Jim Frame]

I use mine on a quick release, and don't find spinning to be a problem. The receiver has enough mass to stay put unless you really poke it hard.

 

[Nate The Surveyor]

OK, I'm putting the Leica Quick Release on it.
Back to the sort of obscure question. IF the bottom of the unit is the point of measure, then that is BASED on the assumption that it is plumb. (assuming tilt is off) then, we would take it that the point of measure is a point that is about 4.75" below the top dead center?
Yet, the actual point of measure, is.... mechanically at the center of the antenna? Maybe?
The poking problem, was more related to the buttons on the sides of the unit. Not the touch screen. My tendency is to grab the whole unit, to stabilize it, and that is related to the Pole having a bipod, and we don't want to knock it over.
BTW, It's a great surveying tool!

N

 

[Adam]

I use mine on a quick release, and don't find spinning to be a problem. The receiver has enough mass to stay put unless you really poke it hard.

I also have it on the leica quick release, it works good.

 

[Nate The Surveyor]

That is, (Re # 5 above) the actual coord is made 4.75" straight down, toward the center of the earth from the TDC of the antenna, regardless of the orientation, or leaning of the LS?

 

[Matt Johnson]

With tilt corrections off the measurement point will the sum of the ARP offset and the entered antenna height straight down from the antenna regardless if is titled or not. With tilt corrections enabled, the measurement point is the tip of the pole if the antenna height is entered correctly.

 

[Nate The Surveyor]

Thanks!