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Equipment used in space applications needs to go through stringent environmental tests to prove that it can survive the extreme conditions experienced during launch and while in space. Some of the key environmental tests include vibration, thermal vacuum, and electromagnetic compatibility.
• Vibration test is important to ensure that the equipment can sustain high impact during rocket launch.
• Thermal vacuum test is crucial to confirm the equipment can operate under the space vacuum condition.
• Electromagnetic compatibility test is required due to densely packed electronic systems operating at various frequencies. RF signals radiated from high power equipment (transmitters) can affect the performance of low power equipment (receivers).
This application note focuses on thermal vacuum (TVAC) test, which is typically the final test to be conducted, and the most complex and expensive test. Detailed planning of the TVAC test is required, and normally done six to eighteen months ahead of the test to ensure success. TVAC testing helps to uncover possible problems such as outgassing of equipment that could contaminate the environment, design flaws due to overheating of materials, and a corona (metal vapor arcing) effect that can cause problems at low pressure.
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