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MIL-PRF-26 Resistors, Fixed, Wire Wound \(Power Type\) General Specification ForThis specification covers the general requirements for power type, wirewound, fixed resistors for use in electrical, communications, and associated equipment. Included are general purpose styles of 5 percent initial resistance tolerance, with power ratings ranging from 3 watts to 240 watts at 25 Degrees C, derated to 0 power at 350 Degrees C \(characteristics N and V\) and precision axial lead types of .1\(B\) percent, .5 \(D\)percent, and 1 \(F\) percent initial resistance tolerances with power ratings ranging from 1 watt to 10 watts at 25 Degrees C, derated to 0 power at 250 degrees C \(characteristic U\).

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MIL-PRF-26H
c.
Test condition D (100,000 feet).
d.
Test voltage during subjection to reduced pressure: As specified (see 3.1).
Nature of potential: As specified in 4.7.8.1d.
e.
f.
Duration of test: 1 minute.
g.
Points of application of test voltage: As specified in 4.7.8.1g.
Final measurements: DC resistance shall be measured as specified in 4.7.2.
h.
i.
Inspection after test: As specified in 4.7.8.1i.
TABLE VI. Temperature for resistance-temperature-characteristic test.
O
Temperature C
For
For
conformance
Sequence
qualification
Inspection
inspection
1/
2/
25  2/
25
1
---
-15
2
-55
3
-55
25
4
2/
25  2/
125
5
125
200
---
6
275
275
7
3/
350
350  3/
8
1/
At the option of the manufacturer the reverse
sequence may be used as shown below:
2/
This temperature shall be considered the
reference temperature for each of succeeding
temperatures.
3/
For characteristic N and V only (see 3.1).
1
-
25 1/
350 2/
2
-
3
-
275
4
-
125
5
-
25 1/
6
-
55
4.7.9 Insulation resistance (see 3.13). Resistors shall be tested in accordance with method 302 of MIL-STD-202.
The following details shall apply:
a.
Test condition letter A.
Special preparation: In accordance with 4.7.8.1a.
b.
c.
Points of measurement: In accordance with 4.7.8.1g.
4.7.10 High-temperature exposure (see 3.14).
4.7.10.1 Mounting. Resistors shall be mounted by their normal mounting means and no soldering shall be used.
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