MIL-PRF-29C
TABLE IV. Group A sampling plan.
Lot size
Sample size
2
to
13
100%
14
to
150
13
151
to
280
20
281
to
500
29
501
to
1,200
34
1,201
to
3,200
42
3,201
to
10,000
50
10,001
to
35,000
60
35,001
to 150,000
74
150,001
to 500,000
90
500,001 and over
102
TABLE V. Group B inspection.
Requirement
Method
Number of
Number of
Test
paragraph
requirement
samples
defects allowed
Dielectric withstanding voltage
Insulation resistance
13
0
Short-time overload
Resistance temperature characteristic 1/
1/
If the manufacturer can demonstrate that this test has been performed five consecutive times with
zero failures, the frequency of this test, with the approval of the qualifying activity, can be
performed on an annual basis. If 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.
4.7 Methods of inspection.
4.7.1 Visual and mechanical inspection. Resistors shall be examined to verify that the materials, design,
construction, physical dimensions, marking and workmanship are in accordance with applicable requirements
4.7.2 Dielectric withstanding voltage. Resistors shall be tested in accordance with method 301 of MIL-STD-202
(see 3.9). The following details and exceptions shall apply:
a.
Special preparation: A metal band .500 inch (12.7 mm) wide (.125 inch (3.17 mm) wide for style C) shall be
centered and tightly clamped at the midpoint of the resistor body.
b.
Magnitude of test voltage: Twice the rated voltage plus 1,000 volts.
c.
Points of application of test voltage: Between each ferrule and the metal clamping band.
d.
Measurements after test: Resistors shall be examined for evidence of flashover or insulation breakdown.
4.7.3 Insulation resistance. Resistors shall be tested in accordance with method 302 of MIL-STD-202. (see 3.10)
The following details and exceptions shall apply:
a.
Test condition B or test condition C (whichever is practicable).
b.
Special preparation: A metal band .500 inch (12.7 mm) wide (.125 inch (3.17 mm) wide for style C) shall be
centered and tightly clamped at the midpoint of the resistor body.
c.
Point of measurement: Between each ferrule and the metal clamping band.
8
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