The prism constant of Trimble’s range of prisms, when used with Trimble surveying equipment are:
| Prism Type | Prism Constant |
|---|---|
| Trimble Traverse Prism | -35mm |
| Trimble 360° VS&S Series Prism | +2mm |
| MultiTrack Target 360° Prism | +10mm |
| Active Track 360° Target | +22mm |
| Reflective Tape | 0mm |
An image of the above table can be downloaded here.
What Is the Accuracy of A Trimble Traverse Prism?
The centre point accuracy of the Trimble Traverse prism is +/-0.3mm (0.01 inch) [source].
Trimble doesn’t have information or any datasheet related to the accuracy of any of their other prisms.
Trimble Prism Constant When Used With A Leica Instrument
To calculate the prism constant to use for Trimble prisms with a Leica surveying instrument you add 34.4mm to the value of the Trimble prism constant.
Trimble prism constant + 34.4 = Leica prism constant
Using the Trimble traverse prism as an example:
-35.0mm + 34.4mm = -0.6mm
When using a Trimble prism with a Leica survey instrument, the prism constant for the Trimble prism is:
| Prism Type | Prism Constant (In Leica Instruments) |
|---|---|
| Trimble Traverse Prism | -0.6mm |
| Trimble 360° VS&S Series Prism | +36.4mm |
| MultiTrack Target 360° Prism | +44.4mm |
| Active Track 360° Target | +56.4mm |
| Reflective Tape | 34.4mm |
Download an image of the Trimble prism constants when using a Leica surveying instrument here.