MIL-PRF-50884 Printed Wiring Board, Flexible Or Rigid-Flex, General Specification ForThis specification establishes the performance and qualification requirements for flexible and rigid-flex printed wiring boards with or without plated through holes \(see 6.1\). Verification is accomplished through the use of one of two methods of product assurance \(appendix A or appendix B\). Detail requirements, specific characteristics, and other provisions which are sensitive to the particular intended use are specified in the applicable master drawing.

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MIL�PRF�50884F

APPENDIX A

A.4.8.5 Electrical inspection.

A.4.8.5.1 Continuity and circuit shorts.

A.4.8.5.1.1 Production screening. Printed wiring boards shall be electrically tested using either automatic or

manual equipment capable of verifying the test level C requirements of IPC�9252 for 100 percent continuity and

isolation.

A.4.8.5.1.2 Qualification and referee testing.

A.4.8.5.1.2.1 Circuit continuity (see A.3.7.5.1.1). A current shall be passed through each net by applying

electrodes on the terminals at each end of the net. The current passed through the net shall not exceed those

specified in the applicable design standard (see A.3.1.1 and appendix D) for the smallest conductor in the circuit. For

manual testing during qualification, the current shall be 1.0 amp minimum and shall be applied for a minimum of 5

seconds.

A.4.8.5.1.2.2 Circuit shorts (isolation resistance) (see A.3.7.5.1.2). A test voltage shall be applied between each

net and all other nets that are adjacent to the net under test. The voltage shall be applied between nets of each layer

and the electrically isolated net of each adjacent layer. For manual testing the voltage shall be 200 volts minimum

and shall be applied for a minimum of 5 seconds. When automated test equipment is used, the minimum applied test

voltage shall be as specified on the applicable master drawing. If a test voltage of the printed wiring board is not

specified on the applicable master drawing, the test voltage shall be the maximum rated voltage of the net being

tested. If no maximum rated voltage is specified, or it is less than 40 volts, then the minimum test voltage shall be 40

volts minimum.

A.4.8.5.2 Circuit or plated-through hole short to metal core substrate (see A.3.7.5.2). A polarizing voltage of 500

volts shall be applied between conductors and or lands and the metal core substrate in a manner such that each

conductor and or land is tested to the conditions of A.4.8.5.1.2.2.

A.4.8.5.3 Dielectric withstanding voltage (see A.3.7.5.3). The printed wiring board test specimen shall be tested in

accordance with test condition B of test method number 2.5.7 of IPC�TM�650. The following details and exceptions

apply:

Test specimen: The printed wiring board test specimen shall be as identified in table A�VIII.

Magnitude of test voltage: Condition B (1,000 V dc +25 V dc, �0 V dc).

Duration of application of test voltage: 30 seconds +3, �0 seconds.

Points of application: The dielectric withstanding voltage shall be applied between all common portions of

each conductor pattern and all adjacent common portions of each conductor pattern. The voltage shall be

applied between conductor patterns of each layer and the electrically isolated pattern of each adjacent layer.

A.4.8.5.4 Impedance testing (see A.3.7.5.4). Impedance testing shall address the parameters required by the

level C requirements of IPC�9252.