The datasheet titled “Resistor; Fixed, Precision High Voltage (Caddock Type MG and HG)” is a detailed technical document outlining the specifications for precision high voltage resistors developed for use in electronic circuits within NASA’s Goddard Space Flight Center (GSFC) space systems. The document, known by its part number S-311-P-683, was originally released on January 7, 1991, with subsequent revisions and approvals documented, including a complete rewrite on July 2, 1996, and incorporated changes on July 5, 2001.
Scope and Application
The specification describes the procurement requirements for fixed, metal oxide, precision high voltage resistors aimed at high-stability applications in high-voltage and high-resistance scenarios within space system electronics. The resistors are identified by specific Goddard part numbers, relating to their design, style, resistance value, and tolerance.
Part Number Composition
The Goddard part number for each resistor includes a Goddard Designator, Style, Resistance Value, and Tolerance. The document explains that the style corresponds to the resistor’s type and size, which can be gleaned from the first three digits of the dash number, as detailed in the specifications’ figure and table. The resistance value is articulated through the subsequent four digits, where the first three represent significant figures and the last specifies the number of zeros to follow. An example provided is “1006” which stands for 100 megohm. Resistance values are chosen within the standard range provided in the document’s Table.
Tolerances and Dimensions
Tolerances for the resistors are indicated with a single letter, adhering to Table II’s specifications. Complementary to the textual descriptions, a resistor outline drawing is included in Figure 1, which provides visual guidance on the physical dimensions of the resistor in both inches and millimeters.
Approval and Documentation
The document mentions several key figures involved in its authorization and approval. The original document was originated by T.J. Perry of Unisys and approved by M.A. Garrison of Unisys. Additional approvals were provided by P.J. Jones and D.G. Cleveland of the NASA Goddard Space Flight Center (GSFC). The datasheet was made available through an IHS Licensee in 2004 and indicates to contact the Document Policy Group for questions or comments.
Revisions and Document Control
The sheet revision status is meticulously tracked to showcase the various amendments it has undergone over the years, indicative of the document’s evolution and adherence to meticulous standards in spacecraft electronic components.
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