DEFENSE & AEROSPACE DIVISION

Force Rating Basis During Vibration Test on ED Shakers

Force = Mass x Acceleration This equation is the basis for selecting sizing shakers and determining if your shaker can perform a specific shock or vibration test. The premise is this: the more mass you put on your shaker, the less acceleration the shaker can produce. And vice-versa: the less mass you put on your …

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X ray & CT Machine

Industrial X- Ray machine: Industrial Radiography is a modality of NDT that uses ionizing radiation to inspect materials and components with the objective of locating and quantifying defects and degradation in material properties that would lead to the failure of engineering structures. This machine plays an important role in the science and technology needed to …

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Understanding -Vibration Test in Defence

In the world of Defence, testing and analysis play a prominent role. Defence transportation involves high stakes, as it transports highly sensitive and dangerous materials. Testing of a defence transportation vehicle involves in vibration testing, shaker testing, vehicle failures, performance testing and product screening. Electrodynamics, data physics and servo hydraulics are the standard solutions, which …

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Solder Ability Test

The solder ability of a substrate is a measure of the ease with which a soldered joint can be made to that material. Good solder ability requires wetting (low contact angle) of the substrate by the solder.

The solder ability of a substrate is a measure of the ease with which a soldered joint can be made to that material. Good solder ability requires wetting (low contact angle) of the substrate by the solder. The procedure, considered to be destructive, tests whether the packaging materials and processes used during manufacturing operations produce a component that can be successfully …

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Conductive Anodic Filament Testing

Conductive anodic filament, also called CAF, is a metallic filament that forms from an electrochemical migration process and is known to cause printed circuit board (PCB) failures. Conductive Anodic Filament (CAF) testing helps to determine the reliability of a printed circuit board (PCB) laminate material or a finished product. With conductor spacing and overall part sizes getting smaller and smaller, the necessity for this test is increasing.

Conductive anodic filament, also called CAF, is a metallic filament that forms from an elector-chemical migration process and is known to cause printed circuit board (PCB) failures. Conductive Anodic Filament (CAF) testing helps to determine the reliability of a printed circuit board (PCB) laminate material or a finished product. With conductor spacing and overall part …

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Parylene Conformal Coating

Conformal Coating - Conformal coating material is a thin polymeric film which ‘conforms’ to the contours of a printed circuit board to protect the board's components. Typically applied at 25-250 μm it is applied to electronic circuitry to act as protection against moisture, dust, chemicals, and temperature extremes that, if uncoated (non-protected), could result in damage or failure of the electronics to function. Reasons for use of Conformal Coating Conformal coatings are used to protect electronic components from the environmental factors they are exposed to. Examples of these factors include moisture, dust, salt, chemicals, temperature changes and mechanical abrasion. Successful conformal coating will prevent the board from corroding. More recently, conformal coatings are being used to reduce the formation of whiskers, and can also prevent current bleed between closely positioned components.

Conformal Coating – Conformal coating material is a thin polymeric film which ‘conforms’ to the contours of a printed circuit board to protect the board’s components. Typically applied at 25-250 μm it is applied to electronic circuitry to act as protection against moisture, dust, chemicals, and temperature extremes that, if uncoated (non-protected), could result in damage or failure of the electronics to function.

Reasons for use of Conformal Coating

Conformal coatings are used to protect electronic components from the environmental factors they are exposed to. Examples of these factors include moisture, dust, salt, chemicals, temperature changes and mechanical abrasion. Successful conformal coating will prevent the board from corroding. More recently, conformal coatings are being used to reduce the formation of whiskers, and can also prevent current bleed between closely positioned components. Conformal coatings are breathable, allowing trapped moisture in electronic boards to escape while maintaining protection from contamination. These coatings are not sealants, and prolonged exposure to vapours will cause transmission and degradation to occur. There are typically four classes of conformal coatings: Acrylic, Urethane, Silicone, and Varnish. While each has its own specific physical and chemical properties each are able to perform the following functions:

Surface Insulation Resistance Testing

Surface insulation reistance testing

Surface Insulation Resistance (SIR) is defined as the resistance, across the surface of the base material, between adjacent conductors of a Printed Circuit Board (PCB). On a typical PCB surface there are primarily four paths for current leakage between adjacent conductors; Through the air, Through surface Contamination, Along the surface, and Through the substrate. The …

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