consider the following pieces of equipment
GZR3, Precision Carrier with
Optical Plummet
With high accuracy optical plummet and
longitudinal bubble for exact positioning
over measurement points. Reflector
centring accuracy 0.3mm, plummet
accuracy 0.5mm at 1.5m.
Order No: 428 340
GZR103, Carrier with
Optical Plummet
Rotatable carrier with longitudinal
bubble for use in tribrachs without
plummet. Reflector centring accuracy
1.0mm, plummet accuracy 0.5mm at
1.5m.
Order No: 725 566
GPR 121, Circular Prism with Holder
Precision circular prism with anti-reflex
coating, mounted in metal holder.
Supplied with removable target plate.
Centring accuracy 1.0mm, range
3500m.
Order No: 641 617
GPR 111, Circular Prism with Holder
Circular prism, sealed in red polymer
holder. Large integrated target plate
provides good visibility. Centring
accuracy 2.0mm, range 2500m.
What kind of error should I expect for a prism with a centering accuracy of 2mm?ÿ when combined with a carrier that has a centering error of 1mm. There is a price difference between the carrier with 0.3mm and the prism that has 1mm centering area. I would rarely if ever need to site 3500 meters away. So I am not convinced that the GZR3 and the GPR 121 would be worth the etxra costs. What is the correct method to model these errors??ÿ Thanks for your help
In looking forward to user errors I personally prefer a metal housing for prism assemblies.
I don't think the GPR121 is that much more expensive than the GPR circular prims mounted in the GPH1 prism holder with the GZT4 target plate.?ÿ The GPH1P is the precision prism with an centering accuracy of 0.3 mm and the price tag to match.?ÿ The 3500 m spec is separate from the centering accuracy.?ÿ That is just the maximum range you can expect a returned distance, if you could see it that far off.