MIL-PRF-39015 Resistors, Variable, Wirewound, \(Lead Screw Actuated\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), lead screw actuated; wirewound variable resistors with a contact bearing uniformly over the surface of the entire resistive element, wound linearly, when positioned by a multiturn lead screw actuator. These resistors are capable of full load operation \(when the maximum resistance is engaged\), at a maximum temperature of 85OC and are capable for continuous operation, when properly derated, at maximum temperature of 150OC \(see 3.6\), with a resistance tolerance of ??5 percent. The ER resistors have life failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.4\). These FR levels are established at a 60 percent confidence level on the basis of life tests.

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MIL-PRF-39015E

TABLE II. Terminals.

Symbol

Type of terminal

Flexible, insulated-wire leads

Printed-circuit pins

W 1/

Printed-circuit pins (edge mounted)

Printed-circuit pins (edge mounted, alternate configuration)

X 2/

Printed-circuit pins (staggered)

Y 3/

1/ Available only in essentially square styles. Pins extend from the

edge 180� away from the screw head, and are parallel to the

longitudinal axis of the lead screw.

2/ Available only in essentially square styles. Pins extend from the

edge 90 � away from the screw head, and are perpendicular to the

longitudinal axis of the lead screw.

3/ Applicable to style RTR12 (Inactive for new design) only.

TABLE III. Product level designator.

Product level

designator

Non-ER

1/ 1.0

1/ 0.1

1/ 0.01

1/ 0.001

1/ FR in percent/1,000 hours

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 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 and 4 of this specification, whether or not they are listed.

2.2 Government documents.

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 SPECIFICATIONS

MIL-PRF-39015/1 - Resistors, Variable, Wire Wound (Lead Screw Actuated), Nonestablished

Reliability and Established Reliability, Style RTR12.

INACTIVE FOR NEW DESIGN.

MIL-PRF-39015/2 - Resistors, Variable, Wire Wound (Lead Screw Actuated), Nonestablished

Reliability and Established Reliability, Style RTR22.

TERMINAL "L" IS INACTIVE FOR NEW DESIGN.

MIL-PRF-39015/3 - Resistors, Variable, Wire Wound (Lead Screw Actuated), Nonestablished

Reliability and Established Reliability, Style RTR24.