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English unit kit with 45° optical targets
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The 803-T is designed as a calibration reference
or scaling kit for theodolite systems and similar three-dimensional measuring
equipment. It can also be used in the construction of monuments or artifacts
for "leapfrogging", providing stable transfer points
with optical targets.
Invar
tubing is great for metrology because it has such
a very low coefficient of thermal expansion, which
effectively eliminates changes in length due to
handling or environmental changes.
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Invar tubes |
12587 Series |
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Tube length tolerance |
±0.0001" |
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Total stackup error |
±0.0005" |
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The Invar tubing in the 803-T is manufactured to
its stated length within ±0.0001". In addition, the tubing
components are hand-picked for each kit so that the total Invar
stackup error does not exceed 0.0005". This means that
you
.jpg) can connect all of the tubes found in a given kit together
end-to-end, and the stack will maintain the total length within the stackup
error. (Table below summarizes this information.) We
often recommend the 803-T when people ask for a calibration
or scaling-quality type system to be used with a theodolite
meausurement system.
Individual components may be assembled to produce lengths
from 2" to 112", in 5" increments.
The table below specifies all included components.
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803-T Invar Kit Components |
Picture
Legend |
Part number |
Description |
803-T
Qty |
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A |
12587-G3 |
20" Invar tube |
4 |
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12587-G2 |
10" Invar tube |
2 |
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12587-G1 |
5" Invar tube |
2 |
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B |
14159 |
Target holder |
2 |
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C |
18-0001 |
Optical target |
2 |
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D |
12406-G1 |
Stainless steel Invar
system connectors |
8 |
| n.a. |
12421-G1 |
Plastic case |
1 |
| n.a. |
n.a. |
NIST traceable
certification for kit |
yes |
Approximate weight: kit and case, 17 lbs; shipping, 22 lbs
Thermal expansion coefficient:
0.70x10−6 in./in./°F for temperature range of 0°F to 200°F |
Invar tubing: 1" diameter Invar with stainless steel end
caps, having 3/8" x 24 internal threads on each end
Finish: Oil and stain resistant PVC jacket (red)
Case: Plastic case with foam insert |
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