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

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the

contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house

contractor personnel, these personnel need to contact the responsible packaging activity to ascertain

packaging requirements. Packaging requirements are maintained by the Inventory Control Point's

packaging activities within the Military Service or Defense Agency, or within the military service's system

commands. Packaging data retrieval is available from the managing Military Department's or Defense

Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging

activity.

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not

mandatory).

6.1 Intended use. Resistors covered by this specification are intended for use in electronic equipment,

and are used for matching, balancing, adjusting circuit variables in computers, telemetering equipment,

and other special applications.

6.2 Acquisition requirements. Acquisition documents should specify the following:

a. Title, number, date of this specification, the applicable associated specification, and the complete

PIN (see 1.2.1).

b. If not otherwise specified (see 2.1), the versions of the individual documents referenced will be

those in effect on the date of release of the solicitation.

Packaging requirements (see 5.1).

d. Allowable substitution (see 3.34.2).

6.3 Qualification. With respect to products requiring qualification, awards will be made only for

products which are, at the time of award or contract, qualified for inclusion in QPL whether or not such

products have actually been so listed by that date. The attention of the contractors is called to these

requirements, and manufacturers are urged to arrange to have the products that they propose to offer to

the Federal Government tested for qualification in order that they may be eligible to be awarded contracts

or orders for the products covered by this specification. The activity responsible for the qualified products

list is the Commander, Communications - Electronics Command, ATTN: AMSEL-LC-LEO-E-EP, Fort

Monmouth, NJ 07703-5023; however, information pertaining to qualification of products may be obtained

from the Defense Supply Center, Columbus (DSCC-VQP), Post Office Box 3990, Columbus, OH 43218-

3990.

6.4 Selection and use information. Equipment designers should refer to MIL-HDBK-199, "Resistors,

Selection and Use of", for a selection of standard resistor types and values for new equipment design. All

applications and use information concerning these resistors are also provided in MIL-HDBK-199.