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

MIL-PRF-49465 Resistor, Fixed, Metal Element, Power Type, Very Low Resistance Values, General Specification ForThis specification covers the general requirements for power type, low value \(1 ohm and below\), fixed resistors \(2 terminal and 4 terminal\) for use in electrical, electronic, communications, and associated equipment. Included are precision resistors of ??1 percent, ??3 percent, and ??5 percent initial resistance tolerances with power ratings ranging from 3 watts to 5 watts at +25 degrees C derated to 0 power at +275 degrees C.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12


img
. . . . . . . .
MIL-PRF-49465C
4.8.5 Thermal shock (see 3.11). Resistors shall be tested in accordance with method 107 of MIL-STD-202. The
following details and exceptions shall apply:
a.
Mounting: In such a manner that there is at least 1 inch of free air space around each resistor, and in such a
position with respect to the air stream that the mounting offers substantially no obstruction to the flow of air
across and around the resistors.
Measurement before cycling: DC resistance shall be measured as specified in 4.8.2.
b.
c.
Test condition: B.
Climate chamber: The rate of temperature change within the climate chamber shall be not less than 2OC
d.
per minute. The temperature shall be maintained at each of the extreme temperatures by means of
circulating air. The air temperature shall be measured by a suitable method and as near the center of the
group of resistors as possible.
e.
When two climate chambers are used: The resistors may be transferred from one chamber to another, in
which case they shall be kept at room temperature for not more than 15 minutes between exposures to the
extreme temperatures.
f.
Measurements after cycling: Not less than 1 hour, but within a 24 hour period after the last cycle, dc
resistance shall be measured as specified in 4.8.2.
g.
Examination after test: Resistors shall be examined for evidence of mechanical damage.
4.8.6 Resistance temperature characteristic (see 3.12). Resistors shall be tested in accordance with method 304
of MIL-STD-202. The test temperature shall be in accordance with table IX.
TABLE IX. Resistance temperature characteristic test temperatures.
Temperature
Temperature
C ±3OC
C ±3OC
O
O
Sequence
(Periodic) 1/
(Qualification)
25  2/
1
25  2/
2
-15
-55
3
-55
25  2/
25  2/
4
125
5
125
6
200
275
7
275
1/ At the option of the manufacturer, the reverse
sequence may be as specified.
2/ This temperature shall be considered the
reference temperature for each of the succeeding
temperatures.
275OC
±3OC
1.
O
±3OC
125 C
2.
O
±3OC
1/
3.
25 C
O
±3OC
-55 C
4.
O
±3OC
1/
25 C
5.
14



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.