MIL-PRF-27208 Resistor, Variable, Wirewound, Nonprecision General Specification ForThis specification covers the general requirements for multiturn, lead-screw actuated and single turn wirewound, variable resistors with a contact bearing uniformly over the entire surface of the entire resistive element, wound linearly, when positioned by an actuator. These resistors are capable of full load operation \(where maximum resistance is engaged\) at maximum ambient temperature of 85 Degrees C, and are capable for continuous operation when properly derated, at a maximum temperature of 150 Degrees C \(see figure 2\). These resistors have a resistance tolerance of ┬▒5 percent \(see 3.1\).

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MIL-PRF-27208F

APPENDIX A

PROCEDURE FOR QUALIFICATION INSPECTION

A.1. SCOPE.

A.1.1 Scope. This appendix details the procedure for submission of sample, with related data, for qualification

inspection of resistors covered by this specification. The procedure for extending qualification required sample to

other resistors covered by this specification is also outlined herein. This appendix is a mandatory part of the

specification. The information contained herein is intended for compliance.

A.2. APPLICABLE DOCUMENTS

A.2.1 General. The documents listed in this section are specified in sections 3, 4, and 5 of this specification. This

section does not include documents cited in other sections of this specification or recommended for additional

information or as examples. While every effort has been made to ensure the completeness of this list, document

users are cautioned that they must meet all specified requirements documents cited in sections 3, 4, and 5 of this

specification, whether or not they are listed.

A.2.2 Government documents.

A.2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a

part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are

those cited in the solicitation or contract.

DEPARTMENT OF DEFENSE STANDARDS

Leads for Electronic Component Parts.

or from the Standard Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia PA 19111-5094.)

A.2.3 Order of precedence. In the event of a conflict between the text of this document, and the references cited

herein (except for associated specifications, specification sheets, or MS sheets); the text of this document takes

precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific

exemption has been obtained.

A.3. SUBMISSION

A.3.1 Sample. A sample consisting of 33 enclosed sample units and 2 unenclosed sample units each with the

same terminal type, and of the highest and lowest resistance values in each style and characteristic for which

qualification is sought will be submitted.

A.4. EXTENT OF QUALIFICATION

A.4.1 Extent of qualification. The resistance range included in the qualification of any one resistor style will be

between the highest and lowest resistance value inspected. Qualification of one terminal type may be extended to

other terminal types provided the internal construction is the same and additional testing is performed in accordance

A.5. SOLDER DIP (RETINNING) LEADS

A.5.1 Solder dip (retinning) leads. The manufacturer may solder dip/retin the leads of products supplied to this

specification provided the solder dip process (A.5.2) or an equivalent process that has been approved by the

qualifying activity.