INCH-POUND
MIL-F-18327F
19 August 2008_
SUPERSEDING
MIL-F-18327E
17 July 1981
MILITARY SPECIFICATION
FILTERS; HIGH PASS, LOW PASS, BAND PASS,
BAND SUPPRESSION, AND DUAL FUNCTIONING,
GENERAL SPECIFICATION FOR
INACTIVE FOR NEW DESIGN
after 31 March 1999
This specification is approved for use by all Depart-
ments and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification covers the general requirements for passive frequency-selective networks, such as
dual functioning, band suppression, band pass, low pass, and high pass (or any combination thereof) electric-wave
filters, including those employing electromechanical and piezoelectric elements, for use over the frequency range of 0
to 500 megahertz. Filters covered by this specification are intended for use where operation under various
environmental conditions is required. This specification covers filters weighing not more than 50 pounds and
requiring root-mean-square test voltage ratings not greater than 5,000 volts.
1.2 Classification.
1.2.1 Type designation. The type designation is in the following form and as specified. The type designation does
not describe a discrete item. For complete identification, the part number and type designation should be referenced.
6
P
X
22
PB
1
FR
Component
Grade
Class
Life
Family
Case and
Composition
(1.2.1.1)
(1.2.1.2)
(1.2.1.3)
expectancy
(1.2.1.5)
mounting
(1.2.1.7)
(1.2.1.4)
dimensions
(1.2.1.6)
1.2.1.1 Component. Filters are identified by the two-letter symbol "FR".
1.2.1.2 Grade. The grade is identified by a single digit in accordance with table I, denoting the type of enclosure
and the vibration frequency level (see 4.7.12).
TABLE I. Grade.
Symbol
Type of enclosure
Vibration frequency
level
Hz
4
10 - 55
Metal-encased
5
10 - 55
Encapsulated
6
10 - 2,000
Metal-encased
7
10 - 2,000
Encapsulated
10 - 500
8
Metal-encased
10 - 500
9
Encapsulated
Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center,
Columbus, DSCC-VAT, Post Office Box 3990, Columbus, OH 43218-3990 or e-mailed to capacitorfilter@dla.mil.
Since contact information can change, you may want to verify the currency of this address information using the
ASSIST Online database at https://assist.daps.dla.mil.
AMSC N/A
FSC 5915
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