Document ID:	MIL-PRF-39009       Scroll down to access document images

Overview

Title:  Resistor, Fixed, Wirewound, (Power Type, Chassis Mounted), Nonestablished Reliability, Established Reliability, General Specification for Scope:  This specification covers the general requirements for nonestablished reliability (non-ER), and established reliability (ER), power type, wirewound, fixed resistors which utilize the principal of heat dissipation through a metal mounting surface. These resistors have initial resistance tolerances of ±1 percent. These resistors are capable for continuous full load operation at an ambient temperature of +25OC, and when derated up to +250OC (see figure 1). These resistors should not be used in circuits where their ac performance is of critical importance in the operation of such circuits. However, provisions have been made in particular styles to minimize inductances (see 3.1). These resistors will have life failure rate levels (FRL) ranging from 1.0 percent to 0.001 percent per 1,000 hours (see 1.2.1.4). These FRL are established at a 60 percent confidence on the basis of the life tests. The FRL, identified by the appropriate symbol, is referred to operation at full rated wattage at +25OC, with a permissible change in resistance of ±2 percent as the criteria for failure. Status:  Active Document Date:  05-AUG-2022         Next Review Due:  04-AUG-2027 FSC/Area:  5905 Doc Category:   Performance Specification   Qualification

Responsibilities

Lead Standardization Activity:  CC  DLA Weapons Support (Columbus)     Preparing Activity: CC  DLA Weapons Support (Columbus) Coordination:  Full   Army Custodian:  CR   US Army Combat Capabilities Development Command, C5ISR Center   Navy Custodian:  EC   Naval Information Warfare Systems Command   Air Force Custodian:  85   Air Force Life Cycle Management Center - Electronic Components, Wire and Ca   DLA Custodian:  CC   DLA Weapons Support (Columbus)

Amendments to military specifications or specification sheets issued after August 1, 2003 are incorporated in the modified document.

Revision History

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