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Introduction The abbreviations, graphic symbols, and logic sym- bology used in the text and diagrams of this manual are in accord and based on ANSI Y1.1-1972, ANSI Y32.2-1970, and ANSI Y32.14-1973 (American National Standard Institute, 345 East 47 Street; New York, N.Y. 10017). Change information has been integrated into the manual by goldenrod insert pages at the back of the manual and page revision. Original pages are identified by the symbol @ and revised pages are identified by a revision date in the lower inside corner of the page. If the serial number of your instrument is lower than the one on the title page, the manual contains revisions that may not apply to your instrument. History or backlog information all previously applicable to produced products with the updated data is integrated when the page or diagram is revised. The following describes the sections and information provided in this manual. Section 1—General Information and Specifications: Contains instrument description, electrical specifications, environmental characteristics, Accessories, installation, and repackaging for shipment instructions. Section 2—Operating Instructions: Information relative to operating and checking the instrument operation. Section 3—Performance Check: Procedure to check the operational performance and electrical specifications of the instrument. Two-part section provides an incoming inspection type check and a detailed electrical performance verification. Section 4—Calibration Procedure: Describes test equipment setup and adjustment procedures required to calibrate the instrument. Section 5—Circuit Description: Provides basic and general circuit analysis that may be useful when servicing or operating the instrument. Section 6—Maintenance Instructions: Describes routine and corrective maintenance procedures with detailed instructions for replacing assemblies, sub- assemblies, and individual components. An exploded drawing is part of Section 10. Section 7—Options and Modifications: Provides data on production options available. Section 8—Electrical Parts List: Provides information necessary to order replaceable parts and assemblies related to the electrical functions of the instrument. Section 9—Diagrams: Provides functional block diagram and detailed circuit schematics. Located adjacent to the diagram (usually on the back of the preceding diagram) are pictorial layout drawings which show sub- assembly and component locations. Voltage and signal level information, if applicable, is included to aid in troubleshooting. Section 10—Mechanical Parts List, Exploded Drawings and Accessories: Provides information necessary to order replaceable mechanical parts. The Parts List is cross- referenced to the Electrical Parts List when appropriate. Exploded drawing shows sequence of assembly and identifies assemblies. Changes and Corrections: Provides updating information for the manual in the form of inserts. These inserts are incorporated into the manual text and diagrams when the manual is updated.