The datasheet titled “Resistor Fixed Precision High Voltage (Caddock Type MG and HG)” details the technical specifications for procurement and outlines the standards for the resistors used in high-voltage electronic circuits in space systems operated by NASA’s Goddard Space Flight Center (GSFC). This document, identified by the specification number S-311-P-683, encompasses a comprehensive review and revision history indicating its original release date on January 7, 1991, and subsequent updates.
Scope and Application
The specification covers fixed metal oxide, precision high voltage resistors. These robust components are designed for critical applications in space system electronics, where they must perform reliably under the demanding conditions of high voltage and resistance, maintaining excellent stability over time.
Part Identification System
Each resistor compliant with the GSFC’s stringent requirements is marked with a specific Goddard part number. This part number comprises several elements that encode information about the resistor’s designator, style, resistance value, and tolerance.
Goddard Part Number Format
The format for the part number consists of a Goddard Designator followed by a style number, the resistance value, and a single-letter tolerance identifier. The style is defined by the first three digits of the dash number, which indicate the type and size of resistor. The resistance value is given by the subsequent four digits, with the first three representing significant figures and the last digit denoting the number of zeros to follow, correlating to megohm values. Tolerance is specified by a single letter in accordance with a detailed table, likely to indicate standard deviation ranges.
Design and Dimensional Specifications
The resistors’ physical characteristics are depicted through outline drawings and dimensional data provided in inches and millimeters. Although the exact figures are not detailed in the excerpt provided, this section of the datasheet would typically include measurements crucial for ensuring that the resistors fit the designated hardware configurations.
Revisions and Document Control
Ownership of the specification is attributed to the National Aeronautics and Space Administration (NASA) supported by documentation copyrights. Notably, the document has undergone revisions, as reflected in the datasheet’s revision history, which indicates that it has been updated to adapt to evolving technical requirements and standards.
Quality Assurance
Endorsement by relevant authorities from Unisys, NASA Goddard Space Flight Center’s Supervisory staff, and other certification bodies underscores the rigorous vetting and approval process behind this specification.
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