MIL-STD-975M (NASA)

ADDITIONAL TESTING REQUIREMENTS

1.0 SCOPE

This appendix contains additional testing requirements for parts to be used in the design and construction of space hardware, its well ;is essential ground support equipment.

2.0 GENERAL

2.1 Introduction. To support the designs required by NASA Programs, this Standard Parts List includes parts that require additional testing prior to use. Therefore, the specified additional tests must be fully complied with in order to use a pan for applicable gride level, and part documentation shall reflect the successful completion of additional testing requirements.

12 Marking. Upon successful completion of additional testing, each part shall be permanently and legibly marked with n NU. except when the contmctor utilizes a Part Control Procedure to implement these requirements and specifies a unique marking, so that the part may be identified and controlled. The marking shall be legible (with a contrasting color), nontoxic, and permanent such that ii meets the resistance-to-solvents requirements of MIL-STD-883. Method 2U15. In addition, the marking shall meet the following outgassing criteria: a maximum total mass loss of 1.0 percent :ind a maximum of 0.10 percent volatile condensable materials when tested in accordance with American Society for Testing and Material (ASTM) Standard Test Method E595.

Alternate methods of pan marking shall be iipproved by the NASA Project Parts Engineer.

3.0 ADDITIONAL TESTING REQUIREMENTS

3.1 Additional Testing Requirements for Crude I Applications.

3.1.1

3.1.1.1 Capacitors, Fixed, Tantalum (Solid) Electrolytic, (CSR). Each pan shall be subjected to a surge current test of five charge/dischiirgc surge current cycles of at least I second ejich per cycle at +25°C. -55°C. and +85°C and maximum rated voltage.1 The surge current test circuit shall comply with the following conditions:

A. The power supply used for charging the capacitors shall be capable of supplying a regulated direct voltage, variable from 0 to 150 volts, at a 15 amp minimum current capability.

B. The energy storage hank shall be placed across the dc-power supply. It shall consist of parallel aluminum electrolytic capacitors having an aggregate c;ip;tcitance of UXljUOOpF. -0, +30 percent, rated at 150 volts dc working or higher.

'Definition of surge current (inrush current) is the peak current, for a given duration, that the will receive from the turn-on of a hank of 100.000 pF aluminum electrolytic capicitors charged to the rated vollage of a given capacitor under test with a maximum series resistance of less than or equal to 0.3 ohm including the , , and .

B.2

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