Original Leica Single Reflector Prism Set GPR121 Prism GDF321
Tribrach and GZR103 Carrier Adaptor
Model: LSP1
Specification:
| Type | Single Prism Set |
| Original Leica Brand | Yes |
| Prism Model | GPR121 |
| Prism Constant | 0mm |
| Centering Accuracy | 1.0mm |
| Prism Type | Circular |
| Tribrach Model | GDF321 |
| Tribrach Type | Without Optical Plummet |
| Torsional Stiffness | <1" |
| Adaptor/Carrier Model | GRZ103 |
| Carrier Type | With Optical Plummet |
| Package | Plastic Carry Case |
| Used for | Leica Total Station |
This Prism Set Includes:
1pc Leica GPR121 Prism
1pc Leica GDF321 Tribrach
1pc Leica GZR103 Tribrach Carrier
1pc Carry Case
What is the offset of a Leica prism?
Similarly, if you are working with a 0mm offset prism (or
reflective tape), you will need to add 34mm. You get the idea.
Remember, with a Leica instrument the Prism Constant Field is
actually the correction you need to enter relative to -34mm, NOT
the actual prism constant (offset) of your prism.
How to set prism constants on a Leica lift?
SETTING PRISM CONSTANTS ON A LEICA TOTAL STATION First a primer on
Prism Constants (also called Prism Offsets), more correctly called
Absolute Prism Constants (APC). Refer to Figure 1 to understand
that an EDM needs to be “told” what prism you are using to
correctly calculate the distance to the Vertical Axis of the prism.
Prism Target Set
Care of the Target Set
A. Cleaning.
1. Clean the plate level and circular bubble with lens paper. If
necessary, moisten a cotton ball or swab with ether or pure
alcohol. Never use liquids such as benzene, oil, or water
2. Wipe paintwork clean. If necessary, use a cloth dampened with
water. Never use liquids such as benzene
3. Wipe a wet instrument carefully with a dry, lintfree cloth. Let
the instrument dry completely before placing it back in the case.
Never store a wet instrument in its case.
4. Keep the case clean, inside and out. Keep the inside dry. If
water gets into the case, wipe it and leave it open to dry
completely.
B. Storage and Transport.
1. The target set should not be stored inside the shipping case,
remove the instrument from the case so that air can flow around it.
This helps to prevent mildew and fungus in the case and instrument.
Store the instrument in a low humidity, dust proof area.
2. The target set is shipped and transported in the foam rubber
padded transportation cases.
C. Adjustments and Calibration.
1. Test the target set on a regular basis. Adjustments made to a
theodolite are useless if the target sets are not properly
adjusted.
2. Calibration and repairs for the target set will be conducted
through the Survey Instrument Calibration Program (SICP).
