MIL-DTL-81963 Servocomponents, Precision Instrument, Rotating, Common Requirements And Tests, General Specification ForThis specification covers common requirements and tests for analog, digital and analog/digital precision instrument rotating servocomponents \(synchros, electrical resolvers, electrical, linear resolvers, transolvers, shaft angle encoders, servomotors, tachometer-generators, servomotor-tachometer generators, stepping motors, and gear heads\). This specification will be used with the applicable general specification, which covers a particular class of servocomponents \(for example, synchros\), together with the documents and the specification sheet that cite MIL-DTL-81963 as a direct reference detailing the specific requirement for the individual servocomponent.

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MIL-DTL-81963C

6.13 Impregnating and potting compounds (see 3.4.5). Refer to Guideline 47 of MIL-HDBK-454, for

additional information on "Encapsulation and Embedment (Potting)". This document is available online at

https://assist.daps.dla.mil from the Standardization Document Order Desk, 700 Robbins Avenue, Building

4D, Philadelphia, PA 19111-5094.

6.14 Electrolytic corrosion protection (see 3.4.7d). Refer to MIL-HDBK-1250, for additional information

on "Corrosion Prevention and Deterioration Control in Electronic Components and Assemblies". This

document is available online at https://assist.daps.dla.mil from the Standardization Document Order

Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.

6.15 Copper wire (see 3.4.17). Refer to NBS-HB-100, for additional information on "Copper Wire

Tables". This Handbook is provided by the U. S. Department of Commerce, National Bureau of

Standards, Washington, DC 20234. However; it is available only in hardcopy under order number

NBSHB100, by calling 1-800-553-6847, from the National Technical Information Service, www.ntis.gov.

6.16 Tin whisker growth (see 3.4.18). The use of alloys with tin content greater than 97 percent, by

mass, may exhibit tin whisker growth problems after manufacture. Tin whiskers may occur anytime from

a day to years after manufacture and can develop under typical operating conditions, on products that

use such materials. Conformal coatings applied over top of a whisker-prone surface will not prevent the

formation of tin whiskers. Alloys of 3 percent lead, by mass, have shown to inhibit the growth of tin

whiskers. For additional information on this matter, refer to ASTM-B545 (Standard Specification for

Electrodeposited Coatings of Tin).

6.17 Changes from previous issue. The margins of this specification are marked with vertical lines to

indicate where changes from the previous issue were made. This was done as a convenience only and

the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and

contractors are cautioned to evaluate the requirements of this document based on the entire content

irrespective of the marginal notations and relationship to the last previous issue.