measuring microscopes
micrometer slide with readout M303LE


micrometer slide with electronic readout M303LE description

A micrometer slide carrying a microscope and mounted on a suitable support constitutes a measuring microscope of great versatility.  The Model M303LE is a new generation of precision micrometer slides based on optical interference fringes rather than on a mechanical lead screw for measurement accuracy.  Measurements are fast, precise, repeatable, free from backlash and easily read.

The Model M303LE has a 4 inch (100mm) range, a linear optical encoder and user switchable inch/metric electronic digital readout reading to 0.000050 inches or 0.0002 mm.  The digital readout display operates on 100 - 264VAC and complies with the European directives on electromagnetic compatibility.

The linear encoder is a non-contact, compact optical digital readhead that references a scale.  The scale is a graduated steel strip 6mm wide and 0.2mm thick with a thin gold surface layer for enhanced reflectivity.  A lacquer coating provides protection and easy cleaning.  An infra-red LED emits light onto the angled scale facets where it is scattered back into the readhead through a transparent phase grating.  Electronics within the readhead amplify and combine these signals to generate two sinusoidal waveforms of equal amplitude producing interference fringes.  Since the reading is made optically, backlash typically found in mechanically coupled systems is eliminated.

The carriage has a threaded hole into which any of our standard microscopes such as the model M101B will fit.  The thread has a 1mm pitch and 0.990 inch major diameter.  Where the viewing scope is to be mounted parallel to the direction of motion, the M304 adapter may be used.  Each slide is equipped with a support rod 19mm (3/4 inch) in diameter and 15cm (6 inches) long that is screwed and pinned into the slide bed. 


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