MIL-F-18327F
6.2 Acquisition requirements. Acquisition documents must specify the following:
a.
Title, number, and date of this specification, the applicable procurement document or drawing and the
complete PIN (see 3.1).
Packaging requirements (see 5.1).
b.
c.
Whether first article inspection is required (see 3.2 and 6.3).
6.3 First article. When first article inspection is required, the contracting officer should provide specific guidance to
offerors whether the item(s) should be a preproduction sample, a first article sample, a first production item, a sample
selected from the first production items, or, a standard production item from the contractor's current inventory (see 3.2),
and the number of items to be tested as specified in 4.5. The contracting officer should also include specific
instructions in acquisition documents regarding arrangements for examinations, approval of first article test results,
and disposition of first articles. Invitations for bids should provide that the Government reserves the right to waive the
requirement for samples for first article inspection to those bidders offering a product which has been previously
acquired or tested by the Government, and that bidders offering such products, who wish to rely on such production or
test, must furnish evidence with the bid that prior Government approval is presently appropriate for the pending
contract. Bidders should not submit alternate bids unless specifically requested to do so in the solicitation.
6.4 Maximum operating temperature. The maximum operating temperature is defined as the maximum ambient
temperature plus temperature rise; however, since generally the temperature rise of filters is negligible, the maximum
operating temperature and maximum ambient temperature in most cases are the same.
6.5 Definitions, electrical parameters. Definitions have been restricted to the terms used in this specification.
6.5.1 Source impedance. Source impedance is the impedance of the circuit from which the filter is driven.
6.5.2 Load impedance. Load impedance is the impedance presented by the load.
6.5.3 Reference frequency. Reference frequency is the frequency at which insertion loss is measured and to
which all discrimination measurements are referred.
6.5.4 Insertion loss. Insertion loss resulting from the insertion of a filter in a transmission system is the ratio of the
voltage delivered before the insertion to that part of the system following the filter, to the voltage delivered to the
same part after the insertion at the reference frequency.
6.6 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin
whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture
and can develop under typical operating conditions, on products that use such materials. Conformal coatings applied
over top of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass,
have shown to inhibit the growth of tin whiskers. For additional information on this matter, refer to ASTM B545,
Standard Specification for Electrodeposited Coating of Tin.
6.7. Environmentally preferable material. Environmentally preferable materials should be used to the maximum
extent possible to meet the requirements of this specification. As of the dating of this document, the U.S.
Environmentally Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals
is available on their website at https://www.epa.gov/epaoswer/hazwaste/minimize/chemlist.htm. Further information is
available at the following EPA site: https://www.epa.gov/epaoswer/hazwaste/minimize/. Included in the EPA list of 31
priority chemicals are cadmium, lead, and mercury. Use of the materials on the list should be minimized or
eliminated unless needed to meet the requirements specified herein (see Section 3).
6.8 Subject term (key word) listing.
Insertion loss
Discrimination
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