Purpose of Tests
In order to verify defense and aerospace vehicle integrity, pyroshock testing is performed in a controlled laboratory environment. Pyroshock testing can be performed using explosive charges or by high energy short duration mechanical impacts. The acceleration time history of a pyroshock approximates decaying sinusoids. Pyroshock refers to any long-term, high-frequency and high amplitude mechanical excitation. Pyroshock exposure can damage circuit boards, dislodge contaminants, short out electrical components or cause other negative consequences. EnScientific Testings and Certification is capable of configuring a pyroshock testing routine to your exact specifications. Generally speaking, pyroshock testing techniques can be classified one of three ways:
- Near-field —Near-field pyroshock testing is accomplished via a mechanical or a pyrotechnically excited simulation. This type of testing is typically employed for amplitudes above 10,000 g and frequencies of 10 kHz or higher.
- Mid-field — Mid-field testing refers to any testing involving frequencies between 3-10 kHz and amplitudes up to 10,000 g. Simulation can be done mechanically by any means other than shaker shock testing.
- Far-field — Lastly, far-field testing encompasses pyrotesting of amplitudes up to 1,000 g at frequencies less than 3 kHz. This is the only type of pyroshock testing for which shaker shock testing is applicable, though mechanical simulation is also an option.
These categories are further defined in MIL-STD-810G, Method 517, and NASA-STD-7003 standards. For more information about various testing options, contact an EnScientific Testings and Certification representative today.
Pyroshock tests involving pyrotechnic (explosive- or propellant-activated) devices are performed to