MIL-DTL-15109D
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of the specification.
b. Issue of DODISS to be cited in the solicitation, and if required, the specific issue of individual
documents referenced (see 2.2.1 and 2.3).
c. Application.
d. Quantity required.
e. Form required (see 1.2).
f. Rating (watts or summation watts, ohms, and amperes) (see 3.3).
g. Voltage (see 3.3.1).
h. Mounting (see 3.3.2).
i. Duty (see 3.3.3).
j. Ambient temperature (see 3.3.4).
k. Enclosure (see 3.3.5).
l. Packaging requirements (see 5.1).
m. Taper (see 6.4.3).
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products which are,
at the time of award of contract, qualified for inclusion in Qualified Products List No. 15109 whether or not such
products have actually been so listed by that 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
covered by this specification. The activity responsible for the Qualified Products List is The Defense supply center,
Columbus (DSCC-VQ), Columbus, OH 43216-5000 and information pertaining to qualification of products may be
obtained from that activity. Application for qualification tests must be made in accordance with "Provisions Governing
Qualification SD-6" (see 6.3.1).
6.3.1 Copies of "Provisions Governing Qualification SD-6" may be obtained upon application to the Document
Automation and Production Service (DAPS), Building 4D (DPM-DODSSP), 700 Robbins Avenue, Philadelphia, PA
19111-5094). Copies may also be viewed or downloaded from the following web sites: https://web7.whs.osd.mil or
https://www.dsp.dla.mil.
6.4 Definitions. The following definitions apply to terms used in this specification.
6.4.1 Minimum current rating. Minimum current rating is the current a rheostat can carry without exceeding the
temperature limits of this specification when the entire resistance element is in the circuit.
6.4.2 Maximum current rating. Maximum current rating is the current a rheostat can carry without exceeding the
temperature limits of this specification when only one step of resistance is in the circuit.
6.4.3 Current taper. Current taper is the ratio of maximum current rating to minimum current rating of a rheostat.
6.4.4 Sigma (Summation) watts. Sigma watts is the product of the maximum current rating, the minimum current
rating, and resistance of a rheostat.
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