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MIL-PRF-18546 Resistors, Fixed, Wire-Wound \(Power Type, Chassis Mounted\), General Specification ForThis specification covers the general requirements for power type, wire wound, fixed resistors which utilize the principal of heat dissipation through a metal mounting surface. The resistors have an initial resistance tolerance of ┬▒1 percent and a resistance temperature characteristic range from 30 ppm/Degrees C to 200 ppm/Degrees C depending upon the resistance value. They are not capable for application when the alternating current \(ac\) characteristics are of critical importance; however, provisions have been made to minimize the inductance.

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MIL-PRF-18546G
TABLE III. Qualification inspection.
Inspection
Requirement
Method
Number of
Number of
paragraph
paragraph
samples
defectives
allowed 1/
Group I
18 coated or
DC resistance 2/
enclosed
0
Visual and mechanical inspection 3/
sample units
3.19 to 3.21 incl.
Group IA 4/
4 coated or
Solderability 5/
enclosed
sample units
Terminal strength
Group II
Resistance temperature
characteristic 2/
6 coated or
Dielectric withstanding voltage
enclosed
Insulation resistance
sample units
Low temperature operation
1
Short time overload
Moisture resistance
Group III
6 coated or
Life
enclosed
sample units
Group IV
6 coated or
enclosed
Shock, (Specified pulse)
Vibration, high frequency
sample units
Group V
4 coated or
Visual and mechanical inspections
enclosed
0
3.19 to 3.21 incl.
sample units
1/ Failure of a resistor in one or more tests of a group shall be charged as a single defect.
2/ Nondestructive tests.
3/ Marking shall be considered defective only if marking or any portion thereof is illegible. Marking shall
remain legible at the end of all tests.
4/ These sample units are subjected to group IA only.
5/ As applicable (see 3.1).
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and
group B inspections.
4.6.1.1 Inspection lot. An inspection lot, as far as practical, shall include resistors of any style within a
given group shown in table IV without regard to resistance value or resistance tolerance, produced under
essentially uniform conditions and offered for inspection at one time. Resistors which differ in design,
construction, materials, and terminal type shall not be included in one lot.
4.6.1.2 Production lot. A production lot consists of parts manufactured from the same basis raw
materials, processed under the same specifications and procedures, and produced with the same
equipment. Each production lot of parts should be a group identified by a common manufacturing record
through all significant manufacturing operations.
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