DAVIDSON OPTRONICS Model D-897 Automatic Autocollimator

AUTOMATIC AUTOCOLLIMATOR -- D-897

Davidson Optronics recommends the Model D-897 Automatic Autocollimator for use in laboratories that require a high degree of sensitivity (down to ą0.01 arc seconds). This unprecedented degree of precision will undoubtedly improve your laboratory's ability to make ultra-fine angular deflection measurements.
Features:

First instrument able to repeat automatic readings to ą0.01 arc seconds

5-10 times more sensitive for closer, more accurate readings

Continuous electrical servo output records and controls

All solid state electronics with modular design facilitates repair

Digital display corresponding to the target reflector angle

The Model D-897 Automatic Autocollimator is an updated version of the Model D-800 which was the first Automatic Autocollimator capable of delivering automatic repeatable measurements down to ą0.01 arc seconds. 0.01 arc second is equivalent to the angle subtended by a quarter (25› coin) viewed from 325 miles away. This illustrates the high degree of precision that the Model D-897 Automatic Autocollimator is capable of delivering.
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-897 Automatic Autocollimator, will provide a direct angular measurement of the reflective surface deviation through acquisition and measurement of the deviated return beam angle.
For theory of operation, please refer to the Principles of Autocollimation Application Note.

Detailed Specifications:

Sensitivity		ą0.01 arc second
Automatic Position Accuracy		ą0.01 arc second over 10 arc seconds (with minimum 1.0" diameter reflector)
Nulling Repeatability		ą0.01 arc second
Measurement Range		ą5 arc seconds
Cross Coupling		ą1 arc second
Linearity		ą2%
Warm-Up Time		30 minutes to achieve normal sensitivity
Automatic Tracking Response Time		4 arc seconds per second of time
Digital Meter		The digital volt meter with LED display corresponds to the angular deflection Full scale will compare to the visual dial. It can also be used to provide an RS-232 output signal.
D.C. Meter		Allows the Model D-897 to be used as an electronic signal autocollimator. The dial rotates until meter is nulled. Dial reading then corresponds to target reflector deflection.
Output A.C. Error Signal		0.05 seconds of time
Meter and D.C. Error Signal		Varies with time constant control Located on front panel of electronics unit
Analog Potentiometer		Accurate to 0.75% of the total range
Nulling Dial		Visual indication of angular deviations 10 complete 1 arc second turns 0.01 arc second graduations numbered every 0.1 arc second Located on optical unit
Acquire Lamp		Illuminates when image is within the acquisition range
Electronics		Solid State
115V Power Supply		80 watts
Aperture Diameter		2" stopped down to 1˝"
Support Stand		3 degrees elevation adjustment
Material	Optics Housing	Cast Aluminum
	Support Stand	Cast Aluminum
Optics Unit Dimensions	Height	9-3/8"
	Width	11"
	Length	10˝"
	Height to Aperture Center	6˝"
Support Stand Dimensions	Length	11-7/8"
	Width	8"
	Thickness	3ž"
Electronics Unit Dimensions	Height	9ž"
	Width	24"
	Depth	16ź"
Power Cable		8' ą6"
Interconnecting Cable		10' ą6"
Finish		Ivory Enamel
Weight	Optics Unit	27 pounds
	Support Stand	33 pounds
	Electronics Unit	55 pounds
Shipping Weight		135 pounds

NOTE: The specifications and description contained in this bulletin also pertain to the Model D-896 Dual Axis Automatic Autocollimator. which measures in both azimuth and elevation.

Options:

P/N 105-1962 Logic Board allows one to align the target reflector without having to constantly look through the eyepiece. Provides a binary coded signal corresponding to acquired left, null, acquired right, not acquired and off.
P/N 105-1963 D.C. Error Signal option provides a D.C. voltage output (for small angles) that corresponds to the target reflector's deviation.
220 ą5V, 50 ą5Hz Power

Optional Accessories:

Model D-239 Two Axis Stand provides the capability of fine adjustment in both elevation and azimuth. This greatly facilitates the initial alignment of the Autocollimator to the Reflector.
Model D-247 Table Instrument Stand
Digital Printer records, upon command, the time and occurrence and the angle displayed on the digital meter.
Voltage Regulator

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