MIL-PRF-39005 Resistors, Fixed, Wirewound \(Accurate\), Nonestablished Reliability, Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\), established reliability \(ER\), accurate, wire-wound, fixed resistors that have a maximum resistance tolerance of 1 percent and a high degree of stability with respect to time under specified environmental conditions. The resistors are capable for continuous full-load \(or voltage\) operation at any ambient temperature up to 125??C, and when derated, up to 145??C \(see 6.5\). They are not capable for application where the alternating current \(ac\) characteristics are of critical importance. ER resistors have life failure rates \(FR\) ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.5\). These FR are established at 60-percent confidence level on the basis of the life tests. The FR, identified by the appropriate symbol, is referred to operation at full rated voltage and temperature.

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MIL-PRF-39005G

4.6.3.2.2 Manufacturers production inspection. If the manufacturers perform tests equal to, or more

stringent than, those specified in subgroup 1, table X as the final step of this production process, group A,

subgroup 1 inspection may be waived and the data resulting from the manufacturers production tests may

be used instead. Authority to waive the subgroup I inspection shall be granted by the qualifying activity

only. The following criteria must be complied with:

a. Tests conducted by the manufacturer during production shall be clearly identical to, or more

stringent than, that specified for subgroup 1. Test conditions shall be equal to, or more stringent

than, those specified for subgroup 1.

b. Manufacturer subjects 100 percent of the product supplied under this specification to their

production tests.

c. The parameters measured and the failure criteria shall be the same as, or more stringent than,

those specified herein.

d. The lot rejection criteria is the same as, or more stringent than, that specified herein.

e. The manufacturer shall make available all information concerning the test procedures and

instrumentation used in their production tests. This data shall be provided as part of the evaluation

required for MIL-STD-790. The manufacturer shall also make available to the Government all

records of all detail test data resulting from production tests.

f. Once approved, the manufacturer shall not change the test procedures or criteria without prior

notification and concurrence by the qualifying activity.

4.6.3.2.3 Subgroup 2. A sample of parts shall be randomly selected in accordance with table XI. If

one or more defects are found, the lot shall be screened and defects removed. After screening and

removal of defects, a new sample of parts shall be randomly selected in accordance with table XI. If one

or more defects are found in this second sample, the lot shall be rejected and shall not be supplied to this

specification.

TABLE XI. Sampling plan for subgroup 2.

Sample size

Lot size

for subgroup 2

1 to

100%

14 to

150

151 to

280

281 to

500

501 to 1,200

1,201 to 3,200

3,201 to 10,000

10,001 to 35,000

35,001 to 150,000

150,001 to 500,000

500,001 and over

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