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Environmental Chamber Terms

Absolute Humidity – The amount of water vapor, or moisture, in a unit of air.
 
Absolute Vibration – The measurement of an object’s vibration in comparison to a fixed point in space.
 
Accelerated Life Testing – The subjection of a product to stress during the development phase in order to gauge the quality of the product. The stress applied to the product often exceeds that which the product would sustain during normal use.
 
Accelerated Stress Testing – The subjection of a product to stress after production in order to identify production flaws before the product reaches retailers and consumers.  
 
Aggravated Testing – The process of applying greater stress to an object than that which the object would sustain during normal use, the purpose of which is to identify guidelines by which the product may be used.
 
Air-To-Air Thermal Shock – Also called “two-zone thermal shock,” this process is the transferring of a product from a hot chamber to a cold chamber or other sudden changes of the air temperature.
 
Ambient Environment – The given temperature and humidity content of an indoor (internal) or outdoor (external) environment.
 
Atmospheric Pressure – The amount of force the atmosphere exerts upon the earth’s surface, measuring 14.7 psi at sea level.
 
Batch Testing – A test procedure in which multiple items are tested at the same time.
 
Burn-In – The hastening of a product’s aging process through the continuous operation of the product, usually at higher than moderate temperatures, in order to evaluate product quality.
 
Calibration – The process of comparison between the current operation of an object or a system and the operating standards of that object or system. Calibration determines the efficiency of an object and identifies errors and the manner in which the system can improve.
 
Corrosion – The gradual deterioration of a metal caused by oxidation or chemical reaction.
 
Critical Frequency – The frequency level at which point the destruction of the object subjected to such frequency begins.
 
Damping – Decrease in the vibration of an object.
 
Dew Point – The temperature of a given unit of saturated (containing the maximum amount of water vapor) air.
 
Dry Room – An environmental chamber in which the humidity level remains below a 14° F/-10° C dew point.
 
Environment – The internal and external conditions, regardless of the source, which affect a given object. The environment includes temperature, humidity, electricity, precipitation, etc.
 
Environmental Stress Screening – The determination of the working efficiency of an object or system through the identification of the effects of thermal changes upon the object or system.
 
Frequency – The rate of movement, measured in cycles, of a wave within a set time frame, usually one second. Frequency is often measured in hertz (Hz), which equals one wave cycle per second.
 
Highly Accelerated Life Test (HALT) – A test that assesses the lifetime of a product, reduces its development cycle time and increases confidence in the life-cycle reliability of the product.
 
Highly Accelerated Stress Test (HAST) – Product reliability test in which an object is subjected to high temperature, humidity and pressure. HAST has also come to be called Autoclave or Pressure Cooker Test (PCT).
 
Hermetic – The airtight sealing of an object.
 
Life Cycle Testing – The subjection of a product to stress comparable to that which the product will sustain during use in order to determine product quality.
 
Liquid-To-Liquid Thermal Shock – Alternately immersing an object in hot and cold liquids.
 
Product Recovery Time – The recovery time of a physical product after it has been subjected to testing. Product recovery time is dependent upon the location of the sensor in the load.
 
Psi (Pounds Per Square Inch ) – Unit that measures the amount of pressure applied to an object.
 
Relative Humidity – The ratio of the current amount of water vapor in a given unit of air at a given temperature to the greatest amount of water vapor the unit of air could hold at that temperature.
 
Relative Vibration – The measurement of an object’s vibration in comparison to a fixed point on the object.
 
Saturation Humidity – The maximum amount of water vapor a given unit of air can hold at a given temperature. Air becomes saturated when relative humidity reaches 100%.
 
Stress – Condition or force applied to an object that may impair the object’s quality and performance.
 
Temperature/Humidity/Bias (THB) Test – Product reliability test in which an object is subjected to high humidity under a constant temperature. Test time greatly exceeds that of HAST test time.
 
Thermal Cycling – Subjecting an object to extreme changes in temperature within a single environmental chamber.
 
Thermal Shock – Stress sustained by an object as a result of rapid temperature changes.
 
Three-zone Thermal Shock – Moving the object from a hot to a cold chamber and vice versa, with an intermediate step of exposure to room temperature.
 
Transfer Time – The amount of time it takes for an object to be moved from one chamber to another.
 
Upstream Recovery Time – Also called “downstream recovery time,” this is the time required for the air temperature to recover in the new zone. Upstream recovery time can be measured in the air stream prior to or following the test load.
 
Vibration – Motion of an object around a position of equilibrium.