DAVIDSON OPTRONICS Model D-638 Coordinate Autocollimator

COORDINATE AUTOCOLLIMATOR -- D-638

Operating ease and convenience are built into the Model D-638 Coordinate Autocollimator. The midsection turret with tilting eyepiece and the adjoining, easily read micrometer drum enables the technician to make more readings with less effort. Hand adjustments of the mirrors in the line of sight is brought approximately 10 inches closer to the viewer so that you can stand normally and comfortably.

Features:

Two axis capability

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-638 Coordinate Autocollimator measures angles around an X-Y axis or intermediate points between obliquely tilted surfaces. By rotating the turret assembly 90° the filar bisection of the target gives a corresponding read-out in arc minutes and seconds on the adjoining micrometer drum, either for 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:

Sensitivity		0.1 arc second
Accuracy		Ŋ arc second over one arc minute, 3 arc seconds over 20 arc minutes (Calibration curve over full range available at nominal cost)
Repeatability		ą0.2 arc seconds or better (standard deviation)
Measuring range		20 arc minutes
Measuring range at long distances		ą10 arc minutes at 30 feet ą2 arc minutes at 125 feet
Arc seconds scale		0.2 arc second graduations Every fifth arc second numbered One revolution equals one arc minute (60 arc seconds)
Arc minutes scale		Counts revolutions of arc seconds scale; graduated from 0 through 20 arc minutes
Aperture Diameter		2-3/8"
Eyepiece Magnification		12X (24X available)
Focal Length		20", folded
Eyepiece Reticle		Vertical 3 arc second wide line
Projected Reticle		Dark field with illuminated concentric circles approximately 2 arc minutes apart around an approximately 10 arc second diameter center dot
Light Source		GE #328 lamp (2 spares included)
115V Power Supply		Model D-416 Power Pack, variable from 0 though 6 volts DC
Housing Material		Aluminum
Base adjustment	Azimuth	ą2°
	Elevation	ą2°
Overall Dimensions	Height	9"
	Width	6"
	Length	12Ŋ"
	Base Length	10Ŋ"
	Height to Aperture Center	3"
Finish		Ivory Enamel
Carrying Case		Finished Hardwood, Ethafoam fitted for instrument and light source
Instrument Weight		21 pounds
Shipping Weight		40 pounds

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 105-2761-638 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-638's.

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