Leo Survey Instrument Co.,Ltd
Leo Survey Instrument Co.,Ltd Professional Survey Accessory Supplier
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Sokkia Type Single Prism Tribrach Set for Surveying Total Station ADS17
Model: AK17
Specification:
| Type | Single Prism Set |
| Color | Prism Red and White; Tribrach and Adaptor Grey |
| Model | ADS17 |
| Target Plate | Metal |
| Prism Constant | 0mm/-30mm |
| Prism Diameter | 64mm |
| Prism Type | Circular |
| Thread Type | 5/8x11 female thread |
| Tribrach Type | Three Jaw; without optical plummet |
| Adaptor Type | With Optical Plummet |
| Package | Hard Carry Case |
| Used for | Different Brands Total Station like Sokkia, Nikon, Trimble, Topcon etc. |
| Category | Optics Instruments Accessory |
Features:
The single prism with target assembly allows the user to quickly adjust the tilting target from behind the prism as it is pointing at the instrument to allow accurate sighting.
The prism can be either mounted in a 0 or -30mm offset position.
Adaptor with optical plummet
With hard carrying case as protection
Prism Range
Surveying Prisms, also known as retro-reflectors, redirect a measuring beam back to the EDM (Electronic Distance Measurement) for processing distance. There are two main factors for good range measurement: prism diameter and beam deviation. If the beam deviation is not accurate then the returned beam will miss the EDM completely. This occurs mainly near the maximum range of the EDM.
Prism Holder Accuracy
Prism accuracy is determined by the physical location of the prism in its canister and then to the prism holder. Certificates of compliance are available upon request.
Survey Prism Offsets
Some Surveying Prisms have an offset due to the fact that the transmitted beam from the EDM takes longer to enter and exit the prism. The longer time translates to a longer distance measured. The distance is corrected by using an 'offset' and/or positioning the prism in relationship to the plumb line of the prism holder. Common offsets are 0, -17.5 mm, -30 mm, -34 mm, and -40 mm. The offset is determined by multiplying the height of the prism against the refractive index of the glass used.
