I have a trimble 5603 TS with 360 prism.?ÿ Is it ok to shoot the prism upside down??ÿ The reason I ask this question, here in louisiana we have many homes and camps located in V zone.?ÿ Being in the V zone requires?ÿ shooting the lowest beam of elevated structures.?ÿ It would be easier to shot the beam holding the rod upside down putting the tip on the beam.?ÿ Just add the target height to the elevation to get the actual.?ÿ ?ÿ?ÿ
I assume you are using a brick prism with a diode in it. For correct results the prism would need to be upright. The brick prisms I had were threaded on both ends so you could just screw the rod into the other end.?ÿ
trimble 360?ÿ
Yes, that top mushroom bit with the bubble in it is threaded on, so you could remove it if needed and add a pole tip for accurate placement on some desirable point of the beam or you could just leave it on, or as above you could attach the whole pole to the top and that way the prism would stay at a more favourable VA to the instrument. But in any case, isn't the trick just to enter a negative pole height in the DC?
Having said that, if as the photo suggests you are using the 360 without the active track diodes or otherwise using the TS in non robotic manual sighting of the prism then, then yes I would have thought it can be used upside down, just like any prism.
Having said that, with the active tracking diode attached in robotic use, I suspect it would work upside down as the vertical and horizontal tracking is done to the IR diodes, while distance is EDM to the prism - at close range the EDM wont be aiming at the prism as they will now be below the diodes and you wont get a prism lock and hence wont be able to take a shot, but at longer range the EDM beam will be wide enough to get a return and hence a shot (I have a 5601 that has poor alignment of the scope and the tracker, such that at 200m the scope is looking 300mm up and to the right of the prisms but the tracker collimation takes care of all that, and the EDM still gets a return).
