• Tactile coordinate measuring machines 
• Measurement volume: (800 mm × 600 mm × 600 mm)
• Installation in air-conditioned environment (20°C ± 0,3 K).
• The measurement uncertainty is tasks-specifically determined after the method of the virtual CMM
• One device is equipped with a laser measuring system in one measuring line (Abbe principle) 
• Contact persons: Konrad Hierse and Dipl.-Ing. Erwin Gettkandt 

• Tactile coordinate measuring machine 
• Measurement volume: (1150 mm × 1000 mm × 1000 mm) 
• Installation in a measurement room with active air and wall temperature control (20°C ± 0.05 K).
• Equipped with a laser measuring system in one measuring line (Abbe principle) 
• The measurement uncertainty is tasks-specifically determined after the method of the virtual CMM
• Contact person: Dipl.-Ing. Norbert Gerwien

• Tactile coordinate measuring machine
• Measurement volume: (850 mm × 1200 mm × 450 mm)
• Installation in air-conditioned environment
• Equipped with a rotary table and a laser measuring system for gear and thread measurements 
• Contact persons: Dr.-Ing. Frank Härtig, Dipl.-Ing. Karin Kniel, Dipl.-Ing. Silke Kraul and Dipl.-Ing. Achim Wedmann

• Coordinate measuring machine allowing combined optical, tactile or optical-tactile measurement
• Measurement volume: (1000 mm × 800 mm × 400 mm)
• Installation in air-conditioned environment
• Contact person: Dipl.-Ing. Jürgen Hirsch

• Multisensor-Coordinate measuring machine for optical and optical-tactile
• Measurement volume: (400 mm x 400 mm x 200 mm)
• specifically measurement uncertainty: (0,5 + L/900) µm
• Contact person: Dr.-Ing. Ulrich Neuschaefer-Rube

• Measuring device developed at PTB to determine the linear thermal expansion coefficient 
• Measurement on test pieces with maximum dimensions of (1000 mm × 1000 mm × 500 mm)
• Calibration uncertainty: see Services
• Contact persons: Dipl.-Ing. Erwin Gettkandt and Dipl.-Ing. Jürgen Hirsch

• optical 3d-measuring machine with fringe projection
• Projector with 1024 x 768 Mikrospiegeln
• Measurement volume: 40 mm x 50 mm
• Contact person: Dr.-Ing. Ulrich Neuschaefer-Rube

• Modular ball bar 
• Length: up to 4 m 
• Calibration uncertainty: 1,0 µm + 2,5×10^-6 × L
• Purpose: Inspection of big CMMs and mobile measuring systems
• Contact person: Dr.-Ing. Klaus Wendt

Involute standards Size: db = 25 mm to 200 mm Calibration uncertainty U for fHa: U ≥ 0,4 µm - 0,8 µm (k=2) Purpose: Correction and inspection of gear measuring instruments  Contact persons: Dr.-Ing. Karin Kniel

Helix slope standards  Size: d = 60 mm to 200 mm Calibration uncertainty U for fHß:  U ≥ 0,5 µm- 1,3µm (k=2) Purpose: Correction and inspection of gear measuring instruments  Contact persons: Dr.-Ing. Karin Kniel

Pitch standards  Size: d = 100 mm to 200 mm Calibration uncertainty U for Fp:  U ≥ 0,2 µm (k=2) Purpose: Correction and inspection of gear measuring instruments  Contact persons: Dr.-Ing. Karin Kniel

Thread standards  Size: d = M6 to M180 Calibration uncertainty U for D2 / d2:  U ≥ 2,0 µm (k=2) Purpose: Calibration of thread gauges  Contact persons: Dr.-Ing. Karin Kniel

Ball plates and hole plates (2D standards)

The laboratory has various ball and hole plates at its disposal. These plates are used to calibrate CMMs (using the PTB software KALKOM), to determine the correction functions for geometric errors and to inspect CMMs. The plates are available in different designs and materials, made e.g. of steel, aluminium, aluminum oxide ceramics, glass ceramics, Zerodur and carbon fibre composites. The largest plate has a ball or hole grid of (960 mm × 960 mm), the smallest, one of (550 mm × 300 mm).

standard ball plate of steel Size: (532 mm × 532 mm) Calibration uncertainty: see Services 1 µm (related to the ball distances) Purpose: Inspection of CMMs  Advantage: offered as standard plate by various manufacturers Contact person: Dr.-Ing. Klaus Wendt

Ball plate of carbon fibre composites (experimental version)  Size: (960 mm × 960 mm), mass: approx. 7 kg  Calibration uncertainty aimed at: 1 µm (related to the ball distances) Purpose: Correction and calibration of CMMs  Advantage: light weight Contact person: Dr. rer. nat. Markus Bartscher

Zerodur hole plate  Size: (550 mm × 550 mm) Calibration uncertainty: see Services Purpose: Correction and calibration of CMMs  Advantage: small calibration uncertainty, high stability, thermal expansion coefficient: almost zero Contact person: Dr.-Ing. Klaus Wendt

Hole plate of quartz glass  Size: (650 mm × 600 mm) Calibration uncertainty: 1.0 µm (related to the ball distances) Purpose: Correction and calibration of CMMs  Advantage: commercially available, thermal expansion coefficient: almost zero Contact person: Dr.-Ing. Klaus Wendt

Cube with spheres as reference elements (3D standard)

Steel-, aluminium- and quartzglass cubes with spheres as reference elements for the interim check of CMMs Sizes: 300 mm x 300 mm x 300 mm - 400 mm × 400 mm x 400 mm Calibration uncertainty (related to the distances of the spheres) : 1,5 µm (steel and aluminium cube) 0.5 µm (quartz glass cube) Determination of the essential error parameters of CMMs within a short time (20-40 min) and control of their changes Simple calibration (15 min, performed manually) by transfer of length from a 1D standard (ball beam)  Contact person: Dipl.-Ing. Norbert Gerwien

Special standards for optical measuring techniques

Test wall for photogrammetry systems, composed of 1D and 2D reference objects Size: 2 m × 3 m Uncertainty of the reference objects: 5 m related to the distances of the targets inside one object  Contactperson: Dr.-Ing. Klaus Wendt