MIL-PRF-49462C
TABLE XI. Resistance temperature characteristic.
Temperature °C
Sequence
1/
Qualification inspection
Group B inspection
Room temperature 2/
Room temperature 2/
1
-15°C ±3°C
-55°C ±3°C
2
-55°C ±3°C
3
Room temperature 2/
+175°C ±3°C
4
Room temperature 2/
+65°C ±3°C
5
6
+125°C ±3°C
7
+175°C ±3°C
1/ At the option of the manufacturer the reverse sequence may be
as follows:
1
Room temperature
+175°C ±3°C
2
3
Room temperature
-55°C ±3°C
4
2/ This temperature shall be considered the reference temperature
for each of the succeeding temperatures.
c. Accuracy of temperature measurement: Resistors shall be maintained for 30 minutes to 45
minutes within 1°C at each of the test temperatures as specified in table XI herein. This tolerance
shall be maintained at the established test temperatures.
4.8.14 Shock (specified pulse) (see 3.19). Resistors shall be tested in accordance with method 213 of
MIL-STD-202. The following details and exceptions shall apply:
a. Special mounting means: Resistors shall be rigidly mounted on an appropriate jig fixtures with
their leads supported at a distance of 0.25 inch from the resistor body. The resistor shall be
mounted with body clamped or cemented to a flat surface. When used, the cement material shall
not extend above the center line in the horizontal plane or beyond the resistor body in the vertical
plane. In no case shall the resistor body be completely encapsulated. These fixtures shall be
constructed in a manner to insure that the points of the resistor mounting supports will have the
same motion as the shock table. Test leads used during this test shall be no larger than AWG size
22 stranded wire (not applicable for resistance value greater than 10 megohms). The test lead
strength shall be no greater than is necessary. In all cases, the resistors shall be mounted in such
a manner that the stress applied is in the direction which would be considered most detrimental.
b. Measurement before shock: DC resistance shall be measured as specified in 4.8.2.
c. Number and direction of applied shocks: The resistors shall be subjected to a total of 10 shocks in
each of two mutually perpendicular planes, 1 perpendicular and the other parallel to the
longitudinal axis of the resistor.
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