MIL-PRF-123 Capacitors, Fixed, Ceramic Dielectric, \(Temperature Stable And General Purpose\), High Reliability, General Specification ForThis specification covers the general requirements for high reliability, general purpose \(BX and BR\) and temperature stable \(BP and BG\) ceramic dielectric fixed capacitors, leaded and nonleaded for space, missile, and other high reliability applications. Capacitors covered by this specification may be used in critical frequency determining applications, timing circuits, and other applications where absolute stability is required \(BP and BG\), and in applications where appreciable variations in capacitance with respect to temperature, voltage, frequency, and life can be tolerated \(BX and BR\). Life tests in this specification are performed at two times rated voltage at maximum rated temperature, and an assumed acceleration factor of 8:1 is used to relate life test data obtained at two times rated voltage to performance at rated voltage.

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MIL-PRF-123D

APPENDIX D

RADIOGRAPHIC INSPECTION

D.1. SCOPE

D.1.1 Scope. This appendix specifies procedures and practices necessary for radiographic inspection of ceramic

capacitors during qualification inspection and group A acceptance inspection. This appendix is a mandatory part of

the specification. The information contained herein is intended for compliance.

D.1.2 Facilities. Radiographs of the capacitors may be made by the capacitor manufacturer or a suitable

independent laboratory. In either case, facilities, equipment, personnel, and techniques shall be in accordance with

the requirements specified herein.

D.1.3 Responsibility for inspection. The capacitor manufacturer shall perform the inspection of the radiograph

films and acceptance/rejection of the capacitors.

D.1.4 Alternative x-ray system and procedures. The manufacturer has the option, with the qualifying activity

approval, to use an alternative x-ray system and procedures to detect the defect criteria identified in this

specification. This alternative system and procedures shall be documented in the MIL-STD-790 program.

D.2. APPLICABLE DOCUMENTS. This section is not applicable to this appendix.

D.3. EQUIPMENT

D.3.1 Dimensions. The dimensional values on which these requirements are based were developed using the

U. S. system. Where such equivalents do not correspond to a standard metric size, the closest standardized metric

equivalent size may be used.

D.3.2 Radiography. The X-ray equipment shall have sufficient voltage range to produce radiographs in

accordance with this document. The equipment shall have a focal spot of 3.5 millimeters (mm) or less and shall

maintain a sharply defined image at a focal film distance of 30 to 60 inches (76.20 to 152.40 centimeters).

D.3.3 Exposure factors. The X-ray exposure factors shall be selected to achieve maximum image detail within the

sensitivity requirements. The film shall be exposed in accordance with the following requirements:

a. X-ray film shall be single emulsion and of a grade defined as very fine grain.

b. H and D film density: 1.5 to 3.0.

c. Milliampere and time settings: Adjusted, as necessary, to obtain satisfactory exposure.

D.3.4 Film. The X-ray film shall be single emulsion and of a grade defined as very fine grain.

D.3.4.1 Sensitivity. X-ray film and equipment shall be capable of detecting metallic particles with a major

dimension of .004 inch (0.10 mm) or greater.

D.3.4.2 Exposure. Exposure factors such as KVP, current, and time shall be compatible with the sensitivity

requirements of D.3.4.1.

D.3.4.3 Film density. The X-ray equipment and processing techniques shall be capable of producing H and D film

density of 1.5 to 3.0 in accordance with the American Standard Printing density type P-2.

D.3.4.4 Film dimensions. Radiographic film shall not exceed 14 inches (35.56 centimeters) in width and 17

inches (43.18 centimeters) in length.