For Parts Inquiries call (727) 344-9615
A Service Disabled Veteran Owned Small Business
© Copyright 2015 Integrated Publishing, Inc.

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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16


img
. . . . . . . . . . . . . .
MIL-PRF-18546G
TABLE VI. Group B inspection. 1/
Inspection
Requirement
Method
Number of
Number of
paragraph
paragraph
sample
defects
allowed
Resistance temperature
13 (highest
0
characteristic
value)
1/ If the manufacturer can demonstrate that this test has been performed five
consecutive time with zero failures, the frequency of this test, with the approval
of the qualifying activity, can be performed on an annual basis. If the design,
material, construction or processing of the part is changed, or if there are any
quality problems or failures, the qualifying activity may require resumption of the
original test frequency.
4.6.4 Inspection of packaging. The sample and inspection of the packaging, preservation, and
container marking shall be in accordance with the requirements of section 5.
4.7 Methods of inspections.
4.7.1 Visual and mechanical inspections. Resistors shall be inspected to verify that the materials,
design, construction, physical dimensions, marking, and workmanship are in accordance with the
applicable requirements (see 3.1, 3.3 to 3.4.5 inclusive, and 3.19 to 3.21 inclusive).
4.7.2 DC resistance (see 3.6). Resistors shall be tested in accordance with method 303 of MIL-STD-
202. The following details and exceptions shall apply:
a. The same measuring apparatus shall be used for any one test, but not necessarily for all tests.
b. Test voltage: The test voltage shall not exceed 1 percent of rated dc voltage (see 3.1). The
voltage used for initial measurement shall for all subsequent measurements.
4.7.3 Solderability (see 3.7). Resistors shall be tested in accordance with method 208 of MIL-STD-
202. The following details shall apply:
a. Both terminals of each sample shall be tested.
b. Terminals shall be immersed sufficiently to cover the flat portion.
11



For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business

© Copyright 2015 Integrated Publishing, Inc. Site Design & Marketing by Strategico.