MIL-PRF-29C
3.10 Insulation resistance. When measured as specified in 4.7.3, the insulation resistance shall be not less than
1,000 times the nominal resistance value of the resistor being tested (see 3.1).
3.11 DC resistance. When tested as specified in 4.7.4, resistors shall have a dc resistance ±0.5 percent of the
nominal resistance specified .
3.11.1 Resistance value deviations. All maximum deviations as specified in this section are to be considered
absolute limits with the exception of the contact resistance adjustments.
3.12 Short-time overload. When tested as specified in 4.7.5, resistors shall nor arc, burn, or char, or show
evidence of other damage. The change in resistance shall not exceed ±0.5percent.
3.13 Temperature rise. When resistors are tested as specified in 4.7.6, they shall operate continuously without
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having a hot spot temperature in excess of 110 C. If impregnating compounds are used, there shall be no leakage or
external displacement of any of the compounds, regardless of the mounting position, at any ambient temperature up
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to and including 85 C.
3.14 Resistance temperature characteristics. When resistors are tested as specified in 4.7.7, the resistance
change shall not exceed +0.02 percent or -0.005 percent (+200 parts per million (ppm) or -50 ppm) per degree
centigrade.
3.15 Thermal shock. When resistors are tested as specified 4.7.8, there shall be no evidence of chipping, crazing,
cracking, or spalling of the exterior coating or enclosure. There shall be no evidence of other mechanical damage.
The change in resistance shall not exceed 0.5 percent.
3.16 Salt water immersion cycling. When resistors are tested as specified in 4.7.9, there shall be no evidence of
mechanical damage. The change in resistance between the initial and any succeeding measurement shall not
exceed 1 percent.
3.17 Vibration. When resistors are tested as specified in 4.7.10, there shall be no evidence of mechanical
damage. The change in resistance shall not exceed 0.5 percent. The dielectric withstanding voltage and insulation
3.18 Security of ferrules. When resistors are tested as specified in 4.7.11, there shall be no shifting or loosening of
either ferrules or visible relative movement of any of the components of the resistors.
3.19 Mechanical strength. When resistors are tested as specified in 4.7.12, there shall be no evidence of
mechanical damage.
3.20 Marking. Resistors shall be marked in accordance with MIL-STD-1285. The type designation and
manufacturer's name or code symbol shall be marked on one ferrule (see figure 1), and the maximum rated voltage
and current on the other ferrule. There shall be no space between the groups of letters and numbers which comprise
the type designation. Marking shall remain legible at the end of all tests.
3.21 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.22 Soldering. When soldering is employed, only noncorrosive fluxes shall be used unless it can be shown that
corrosive elements have been satisfactorily removed after soldering. Electrical connections shall be mechanically
secure before and electrically continuous after soldering.
3.23 Workmanship. Resistors shall be processed in such a manner as to be uniform in quality and shall be free
from other defects that will affect life, serviceability, or appearance.
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