Dave Karoly, post: 442785, member: 94 wrote: I bet it's something simpler than collimation. It could be as simple as, are you sure your pole is 2 meters? I mean have you taken a pocket tape and actually measured it? Maybe the tip is shorter or the prism isn't standard height.
Sounds like. If all the checks are consistantly 0.05', no matter the distance from the instrument, i'd be checking the target height. I know Leica specs out their prisms in a datasheet, maybe Trimble does this also. Maybe switch to fine measurement for your setting-out and checking points.
There was a thread some time back where a Leica TCRP 1200 would fairly consistantly shoot 0.05' elevation difference in the backsight.
Here is something I found interesting about Trimble Multi-track prism. Going to have to give that a try.
