Dimensional Metrology - Procontrol AMC

metemFacts and AccessoriesMETEM ANALOGUE PROBESThe working principle of Metem analogue probes is mainly based on two small transformerssharing the same magnetical core. When the core is moved, the output signal from one ofthe transformers increases while the other decreases. The “imbalance current” is a measureof the core position, and the best linearity is present around the middle point, where thetransformers are almost in balance.A Metem probe is sensitive, reliable and has good repeatability.The accepted working method is to measure a perfect workpiece (an adjustment standard)and then measure the unknown piece. In this way accuracy is derived from the adjustmentstandard and the measuring probe is used as a tool of comparison. The standard is to bemeasured once a day, or whenever the temperature is changing, in order to efficiently calibrateaway all other variables deriving from fixtures, etc. The probe output signal returns tothe original state when the power has been switched off. Metem probes work with alternatingcurrent and the supporting electronics must include modulators/demodulators, amplifiersand controls for zero setting and amplification adjustment.PerformanceThe functioning principles for analogue measuring probes have been known for over ahundred years, and the design has been refined over more than a quarter of a century. Themost important capability parameters are repeatability and linearity. The Metem probesretain the same sensitivity all along the measuring stroke, and the linearity quoted for thestandard probes includes sensitivity dependent errors.CONTACT TIPSMost of the contact tip options with a standard M2.5 thread that are available on the marketfit Metem probes. C E Johansson offers a wide range of measuring tips and tip extensions.The measuring tips that are standard for each probe type are presented below.Art. no.8647-010198647-01036DescriptionCarbide ball Ø 3.85 mmCarbide, radius 1.5 mmFor Probe Type910,911,913917CABLE EXTENSIONSThe probe cables are 2 meters long as standard. Cable extensions up to 10 meters areavailable for large distances between measuring probe and instrument.Art. no.TypeLength Art. no. TypeLength8648-01024M964-11 m.8648-01028M964-55 m.8648-01025M964-22 m.8648-01029M964-66 m.8648-01026M964-33 m.8648-01030M964-88 m.8648-01027M964-44 m.8648-01031M964-1010 m.Contact us at info@cej.se • Phone +46 (0) 16 15 06 40 • Fax +46 (0) 16 15 06 59 33