Quartz crystal units for frequency control and selection. Part 3 : Standard outlines and pin connections.

This document represents a supplementary amendment established by an international standards body specializing in electrotechnology. Issued in the late 1970s, it serves as an addendum to an existing technical specification concerning the classification and designation of electrical components. The primary purpose of this supplement is to introduce new definitions, update existing parameters, or clarify specific requirements related to the component specifications originally outlined in the base standard. By providing these additional technical details, the document ensures that industry practitioners and manufacturers maintain consistency in design, testing, and application procedures. It addresses emerging technical nuances or corrections necessary to align the core specification with current industry practices and safety expectations without altering the fundamental scope of the original text. This amendment is intended to be read in conjunction with the principal document it modifies, offering precise guidance on how the updated information should be integrated into existing regulatory frameworks and product standards.