TWO AXIS AUTOCOLLIMATORS -- D-656 The Model D-656 Two Axis Autocollimator excels in measuring two orthogonal planes because both azimuth and elevation readings are obtained with the same dial.  This eliminates the error often introduced by autocollimator barrel rotation when alternating between azimuth and elevation positions.  The midsection eyepiece has sufficient eye relief for those who wear glasses; also, eye strain is reduced by the dark field reticle with illuminated target (see above) and the distinct black crosshair filar marked to show azimuth and elevation.  Rotating the micrometer dial causes the filar to travel across the field until the proper line bisects the center of the target.  No numbers or scales confuse the field of view, but are carried entirely on the micrometer drum.  The Model D-656 functions efficiently on optically fiat surfaces and on aluminized surfaces as small as ½ inch in diameter. Features: Measure both orthogonal planes without adjustment 20 arc minute measuring range Compact folded design makes alignment easy Built-in adjustable mounting base Center tilted eyepiece for easy viewing Dark field projected reticle and external readout reduce eye fatigue Certification of accuracy traceable to National Institute of Standards and Technology Applications: The Model D-656 Two Axis Autocollimator measures angles around an X-Y axis or intermediate points between obliquely tilted surfaces.  The filar bisection of the target gives a read-out in arc minutes and arc seconds on the adjoining micrometer drum for both azimuth or elevation.  Azimuth and elevation adjustment are quickly made with fine thread adjustment screws mounted in base. Autocollimator functions: The basic function of an autocollimator is to detect and measure a deviation in the position of a reference reflective surface.  The autocollimator projects a collimated beam of light onto a reflective surface.  When a deviation in the position of that reflective surface occurs, a deviated beam of collimated light returns to the autocollimator.  A direct angular reading autocollimator, such as the Model D-638 Coordinate Autocollimator or the Model D-656 Two Axis Autocollimator, will provide a direct angular measurement of the reflective surface deviation through acquisition and measurement of the deviated return beam angle. For more theory of operation, please refer to the Principles of Autocollimation Application Note.

Detailed Specifications:

Optional Accessories:
• Model D-165 High Intensity Light Source.  This option may be required when autocollimating off of low reflectivity surfaces or small mirrors.
• Model D-247 Table Instrument Stand
• Model D-416B 220V 50Hz Power Supply
• P/N 105-2761-656 Video Camera & Monitor with integral camera power supply.  With this option readings become very easy even for unskilled personnel.  Repeat readings are more accurate and faster.  The camera eliminates any errors from parallax and greatly reduces eye fatigue.  This option is easily added to existing Model D-271's.

Davidson Optronics, Inc.
Phone: (626) 962-5181
Fax: (626) 962-5188
E-mail: sales@davidsonoptronics.com

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Most recently updated: March 3, 2008