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MIL-PRF-12934K, PERFORMANCE SPECIFICATION: RESISTORS, VARIABLE, WIRE WOUND, PRECISION, GENERAL SPECIFICATION FOR (14 APR 2004)., This specification covers the general requirements for precision, wire-wound, variable resistors whose electrical output (in terms of percent of applied voltage) are linear or nonlinear with respects to the angular position of the shaft. This specification includes requirements for linear and nonlinear, single turn and multiturn, single-section (cup) and multisection variable resistors. These resistors are capable of full-load operation at maximum ambient temperatures of 70OC and 85OC and are suitable for continuous operation, when properly derated, to maximum temperatures of 125OC and 150OC (see 3.1, 6.2, and figure 10). This specification includes requirements for category I, category II, and category III precision resistors as described herein (see 3.2).