NPFC - MIL-PRF-39023
RESISTORS, VARIABLE, NONWIREWOUND, PRECISION GENERAL SPECIFICATION FOR
|Publication Date:||21 September 2010|
This specification covers the general requirements for precision, nonwirewound, variable resistors whose electrical output (in terms of percent of applied voltage) are linear or nonlinear with respect to the angular position of the operating shaft. This specification includes requirements for linear and nonlinear, single turn and multiturn, single-section (cup) and multi-section variable resistors. These resistors have a resistance tolerance of ±10 percent. These resistors are capable of full-load operation at maximum ambient temperatures of 70OC and are capable for continuous operation, when properly derated, to maximum temperatures of 125OC, (see 3.1, 6.2, and figure 10). This specification includes procedures and requirements for the acquisition of category I, category II, and category III precision resistors.
The resistors covered by this specification are military unique due to the fact that these devices must be able to operate satisfactorily in military systems under the following... View More
The resistors covered by this specification are military unique due to the fact that these devices must be able to operate satisfactorily in military systems under the following demanding conditions: 15 Gs of high frequency vibration, 100 Gs of shock (specified pulse), 25,000 cycles of endurance at the maximum temperature, thermal shock (with no more than 5 percent deviation in initial resistance), low temperature coefficient of resistance, and resistant to salt corrosion. In addition, these military requirements are verified under a qualification system. Commercial components are not designed to withstand these military environmental conditions.View Less