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info@retter.de +49 (0) 7431 - 3122 info@retter.de 
Features • Stress-free mounting of test object on CMM table
• Reduction of thermal influences through insulated handles
• The test spheres are located in the "non-bending" plane to prevent varying intersphere distances due to changes in position within the measuring volume
• Stable, vibration-free design with sectional frame
• The use of high-grade steel and special aging processes ensures exceptional long-term and dimensional stability
• The multisphere standard's symmetrical design prevents testpiece deformation due to variations in temperature.
• The robust design of the multisphere standard and the antivibration lining of its transport container (shock-resistant plastic) make deformation resulting from transport and chucking virtually impossible
• The probing elements are embedded in the test plate for optimum protection
• Only extremely wear resisting and true to form ceramic or steel spheres are used. Furthermore, these elements are also securely precision-inserted in specially developed, deformation-free receptacles
• The test spheres are fastened in the multisphere standard in such a way that half of a test sphere can be probed by a spherical probe tip with a diameter 8 mm without restrictions.
• In its upright position, the multisphere test standard can be probed from either side.
• Convenient setup and reconfiguration through a perfected upright positioning system and practical accessories.
• Fast, rational measurement and evaluation using software specially developed by the CMM manufacturer.
• Both the multisphere standard and the probe testing unit can be calibrated either by the PTB (German Federal Physical-technical Institute) or by the DKD (German Calibration Service). This ensures traceability to official master reference standards
Probe Testing Unit 
• Used for separate inspection of the probe system. Comprises a 30 mm ring gage and a 30 mm ceramic calibration (datum) sphere with holder
• Correct orientation of the face of the ring gage to the multisphere standard is always ensured if the entire holder is shifted 90°
Special Designs and Extra Equipment 
• Special plate sizes available on request
• Special clamping systems (fixtures) e.g. double frames, 35° clamping system
• Feed (loading) and swiveling systems for manual or automatic inspection
• Multisphere standards made of other materials, e.g. aluminum and invar
TECHNICAL DATA *RETTER* Two-dimensional inspection system RP 05
| Version | Typ | MB 300 Typ A | MB 400 Typ B | MB 600 Typ C |
| Dimension | (mm) | 320x320x24 | 420x420x24 | 620x620x24 |
| app. weight | (kg) | 11 | 18 | 32 |
| Intersphere distance | (mm) | 240 (4x60) | 322 (4x83) | 532 (4x133) |
| Transport and storage container | (WxDxH) | 630x600x225 | 630x600x225 | 870x810x230 |
Multisphere test standard
| Test sphere | Ceramic | Steel |
| Number of spheres | 25 | 25 |
| Sphere diameter | 22 mm | 22 mm |
| Sphericity | < 0,3 µ m | < 1,0 µ m |
| Material | AI203 | 1,3541 |
| Hardness | > 1650 HV | 600 - 670 HV |
| Temperatur expansion coefficient | a=5,5 x 10-6°K-1 | a=11,5 x 10-6°K-1 |
Probe testing unit
| Ring gage | |
| Diameter of ring: | 30 mm |
| Shape tolerance: | < 3 µm |
| Temperatur expansion coefficient: | a=11,5 x 10-6°K-1 |
| Calibration sphere | |
| Sphere diameter: | 30 mm |
| Shape tolerance: | < 0,15 µm |
| Temperatur expansion coefficient: | a=5,5 x 10-6°K-1 |
| Hardness: | > 1650 HV |
PROGRAM OF DELIVERY 
• Multisphere standard in 3 standard sizes with upright positioning system
• Probe testing unit
• Probe testing unit
• Transport and storage container