MIL-R-93F
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The resistors covered by this specification are military unique due to the fact that these devices must be able to operate satisfactorily in military systems under the following demanding conditions: 15 g's of high frequency vibration, 50 g's of shock (specified pulse), and 50 g's of acceleration. In addition, these military requirements are verified under a qualification system. Commercial components are not designed to withstand these military environmental conditions.
6.2 Acquisition documents. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
* b. If not otherwise specified (see 2.1), the versions of the individual documents referenced will be those in effect on the date of release of the solicitation.
c. Packaging requirements (see 5.1).
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products that are, at the time of award of contract, qualified for inclusion in the applicable QPL whether or not such products have actually been so listed by the date. The attention of the contractors is called to these requirements, and manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government tested for qualification in order that they may be eligible to be awarded contracts or purchase orders for the products cover by this specification. The activity responsible for the QPL and, information pertaining to qualification of products may be obtained from the Defense Supply Center, Columbus, (DSCC-VQP) Post Office Box 3990, Columbus, OH 43218-3990.
6.4 High frequency. Resistors should not be used in circuits where their ac performance is of critical importance in the operation of such circuits, unless supplementary requirements are specified in the contract or order for controlling the ac properties, no type designation should appear on the resistor (see
1.2.1 and 3.23).
6.5 Mounting. It is suggested that wire lead terminal resistors be mounted by restraining their bodies from movement when shock or high frequency vibration forces of the magnitudes, enumerated in this specification, are to be encountered.
6.6 Power rating. The power ratings of these resistors are conservative and are approximately 50 percent of the corresponding commercial ratings.
6.7 Supersession data.
6.7.1 Resistance tolerance. Resistors identified under MIL-R-93C with an initial resistance tolerance of
±0.25 percent (symbol C) may be replaced with resistors from this specification of ±0.1 percent, or ±0.05 percent tolerances.
6.7.2 Resistance temperature characteristic. Resistors of characteristic "E" (although different in numerical value of resistance temperature characteristic are interchangeable with "E" characteristics resistors, under MIL-R-93C. In addition, characteristic "E"," L", and "M" are superseded by characteristic "E" of this specification.
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