Metric unit kit with retroreflective 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.
The Invar tubing in the 803-MCP is manufactured to its stated length within ±0.003 mm. In addition, the Invar tubing components are hand-picked for each kit so that the total stackup error does not exceed 0.013 mm. This means that you 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. (The table above summarizes this information.) We often recommend the 803-MCP when people ask for a metric calibration or scaling-quality system.
Individual components may be assembled to produce reference lengths from 225 mm to about 2850 mm, in 125 mm increments. The table below specifies all included components.
803-MCP Invar Kit Components
|A||12587-500MM||500MM Invar tube||4|
|12587-250MM||250MM Invar tube||2|
|12587-125MM||125MM Invar tube||2|
|B||15483-2||Retroreflective target; 6.35MM dot, 25MM offset||4|
|C||15484-2||Target holder; 25MM offset||4|
|D||12406-G1||Stainless steel connectors||10|
|n.a.||n.a.||NIST traceable certification for kit||yes|
|Case||Plastic case with foam insert|
|Finish||Oil and stain resistant PVC jacket, yellow|
|Invar Tubing||1″ (25.4 mm) diameter Invar with stainless steel end caps, having 3/8″-24 internal threads on each end|
|Thermal Expansion Coefficient||0.68 x 10-6 in./in.°F for temperature range of 0-200°F (1.26 x 10-6 m/m/°C for temperature range of -18°C to 93°C)|
|Weight, Product & Case (Approx.) lb||17|
|Weight, Product & Case (Approx.) kg||7.7|
|Weight, Shipping (Approx.) lb||22|
|Weight, Shipping (Approx.) kg||10|