scope:

This specification covers the general requirements for established reliability fixed, radio frequency, molded coils which are resistant to immersion and moisture. Radio frequency coils meeting the requirements specified herein have failure rate levels ranging from 1.0 percent per 1,000 hours to 0.001 percent per 1,000 hours which are established at a 60 percent confidence level (see 1.2.1.4). The failure rate level identified by the applicable symbol specified in table III is referred to operation at full load cyclic condition at the specified ambient temperature (see 3.1). A part per million (PPM) quality system is used for documenting and reporting the average outgoing quality of coils supplied to this specification. Statistical process control (SPC) techniques are required in the manufacturing process to minimize variation in production of coils supplied to the requirements of this specification.

The PIN consists of the letter M, the basic number of the specification sheet, and alphanumeric designators (see 3.1) as shown in the following example:

The classes of coils denoting the maximum operating temperatures (see 3.1) are identified by a single letter in accordance with table I. TABLE I. Maximum operating temperature.

Class Temperature ------------------------- °C A 105 B 125 F 150

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: US Army Research Laboratory, ATTN: AMSRL-EP-RD, Fort Monmouth, NJ 07703-5601 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The nominal inductance value expressed in microhenries (µH) is identified by three symbols in accordance with the following:

Nominal inductance values less than 10 µH are identified with two numbers representing the significant figures and the letter (R) designating decimal point location.

Example: 0.12 µH=R12; 1.2 µH=1R2

Nominal inductance values of 10 µH and greater are identified by a 3-digit number. The first two digits represent significant figures, and the last digit specifies the number of zeroes to follow.

Example: 12 µH=120; 120 µH=121

The inductance tolerance is identified by a single letter in accordance with table II. TABLE II. Inductance tolerance.

Symbol Tolerance ------------------------ percent J ± 5 K ± 10 L ± 20

The specified failure rate level per 1,000 hours is initially established at the 60 percent consumer's confidence level and maintained at a 10 percent producer's risk is identified by a single letter in accordance with table III and as described in MIL-STD-690. TABLE III. Failure rate level (established at a 60 percent confidence level).

Symbol Failure rate level (percent/1,000 hours) ------------------------------------ M 1.0 P 0.1 R 0.01 S 0.001

intended Use: