Accelerometers are sensors and instruments for measuring, displaying and analyzing acceleration and vibration. They can be used on a stand-alone basis, or in conjunction with a data acquisition system. Accelerometers are available in many forms. They can be raw sensing elements, packaged transducers, or as a sensor system or instrument, incorporating features such as totalizing, local or remote display and data recording. Accelerometers can have from one axis to three axes of measurement, the multiple axes typically being orthogonal to each other. These devices work on many operating principles. The most common types of accelerometers are piezoelectric, capacitance, null-balance, strain gage, resonance, piezoresistive and magnetic induction.
Vibration sensors are sensors for measuring, displaying and analyzing linear velocity, displacement and proximity, or else acceleration. They can be used on a stand-alone basis, or in conjunction with a data acquisition system. Vibration sensors are available in many forms. They can be raw sensing elements, packaged transducers, or as a sensor system or instrument, incorporating features such as totalizing, local or remote display and data recording.
Measurement microphones are most commonly condenser microphones in which sound pressure actuates a diaphragm that is one plate of a capacitor. The relative motion of the capacitor plates causes a change in capacitance and the resulting voltage is measured and converted into a reading such as sound pressure level (SPL).
Measurement microphones are described by type of sound field. Pressure field measurement microphones are used to measure sound pressure that has the same magnitude and phase throughout the field. Free field microphones are used to measure a plane wave that is propagating freely in one defined direction. Diffuse field measurement microphones, also known as random incidence microphones, measure sound waves from all directions.
Ultrasonic transducers send and receive waves for many types of sensing. Distance, proximity, level, nondestructive evaluation, web break detection, counting, and security applications are some examples. They typically operate at their resonant frequency with various construction options, beam patterns, and power levels.
Underwater acoustic transducers can contain both transmitters and receivers, or they can be solely transmitters used in conjunction with a hydrophone. They sense reflected sound and use distance and directional data for communication, mapping and navigation. Underwater acoustic transducers have an operational range, but are usually designed to operate at their resonance frequency to maximize output power. They are most typically single frequency transmitters, but they may contain multiple transmitters and receivers for different frequencies.
Hydrophones are underwater acoustic sensors, which most commonly use piezoelectric technology. They can be used singly or in arrays that can contain dozens or hundreds of individual units. They are used in marine geological and biological research, undersea mapping and navigation, and various commercial and military applications.
Impact hammers are used in structural and modal analysis to determine component or system response to impacts of varying amplitude and duration. It is simply a hammer with a force transducer in its head is paired with an accelerometer on the component being tested to compare impact and response. Impact hammers are used for modal and structural behavior analysis for all types of components and systems. The most critical specifications for impact hammers are the force and pulse duration, both rated by minimums and maximums. Force is measured in pounds, kg, N and other similar units. The pulse duration, a measurement of the time the hammer is imparting a force on the object being tested, is a very short span of time, often measured in milliseconds. Another important specification is the upper limit of the frequency range. This is the highest frequency for which the response will be tested, and can be altered by using accessory tips, if available.
Position sensors encompass a wide range of sensors, switches and technologies that are used to determine the placement, speed or movement, direction, and location of a given target. Linear position devices include cable extension, capacitive, eddy current, fiber optic, Hall effect, inductive, magneto resistive, optical triangulation, photoelectric, position displacement, ultrasonic, and variable resistance technology sensors. Other instruments include laser micrometers, linear encoders, linear potentiometers, and LVDTs. Rotary position sensors include rotary encoders and angular position sensors. Orientation position sensors include encoders, inertial gyros, and inclinometers.
Shakers and vibration and shock testing equipment are force generators or transducers that provide a vibration, shock or modal excitation source for testing and analysis. Shakers are used to determine product or component performance under vibration or shock loads, detect flaws through modal analysis, verify product designs, measure structural fatigue of a system or material or simulate the shock or vibration conditions found in aerospace, transportation or other areas.
Shaker controllers are units designed to control shaker tables. The simplest types of shaker controllers are controlled manually and depend on the operator to read and evaluate the feedback signal and adjust the amplifier signal input voltage accordingly. This type of system can be as simple as a sine wave signal generator and an accelerometer monitored by a voltmeter. It is left to the operator to manually make the necessary gain compensation for changes in frequency or desired level specifications.
Sound level meters and noise dosimeters are used in many kinds of sound and noise analysis including industrial safety, traffic and transportation noise quantification, and scientific noise measurement. They are frequently hand-held and battery-powered. Sound level meters measure real-time sound and can have functions such as signal analysis, noise dose measurement, and different time and frequency weighting.
Ultrasonic instruments (UT) are devices that use ultrasonic signals to inspect materials and components. UT inspection techniques can be used, for instance, to detect surface and subsurface flaws or to measure thickness. Beams of high frequency acoustic energy are introduced into the material and subsequently retrieved. Distance calculations are based on the speed of sound through the material being evaluated. The most widely used of all UT techniques is the pulse-echo technique. Flaws are detected and sizes estimated by comparing the amplitude of a reflected echo from an interface (flaw or back surface) with that of a reference interface of known size.
Instruments for measuring and analyzing vibration or acceleration, using accelerometers or displacement sensors including systems for vibration testing, and modal analysis such as the instrumentation to acquire data and/or analyze results. Vibration instruments are used for measuring, displaying and analyzing vibration. Typically these instruments comprise a transducer, data acquisition and either a local display or some sort of output to a computer or another instrument. Vibration instruments can have many features, including incorporating features such as totalizing, local or remote display and data recording. They may be stationary or else portable field-type instruments.
Other unlisted, specialized or proprietary acoustic or vibration instrument or test equipment.
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Bench repair refers to off-site equipment or instrument repair in the service supplier's shop. The test equipment or instruments need to be disconnected and transported to or picked up by the repair shop.
Calibration services for various test equipment and instruments including evaluating the output or accuracy compared to standards or established values.
Supplier has personnel and/or equipment for on-site installation and start-up of new, repaired or replacement equipment or instruments. The supplier may also provide personnel training and test the acceptability of the equipment to the required specifications.
Preventative maintenance and services contracts refer to programs for performing proactive maintenance in order to prevent system problems. This is contrasted to troubleshooting, diagnostic or corrective maintenance, which is performed to correct an already existing problem.
Supplier has personnel and/or equipment for to completely overhaul or rebuild equipment or instruments, which may be an effective alternative for costly or specialized units.
Supplier has capabilities and resources for exchanging the damaged equipment or instrument with a new or used unit, which can minimize any downtime in the facility or eliminate the need to ship and outsource work.
Supplier expedites repairs by carrying an inventory of spare replacement parts or sub-systems in-house, eliminating the added time that ordering and shipping parts would require.
Troubleshooting refers to diagnostic or corrective maintenance, which is performed to correct an already-existing problem. This is contrasted to preventive maintenance, which refers to performing proactive maintenance in order to prevent system problems.
Service to upgrade or enhance the performance of an existing product through the addition of an entirely new component or replacement of a component with a improved or updated unit.
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ISO 17025 addresses the proficiency of the organization to perform the testing and calibration activities. It is a standard geared towards technical qualification and deals heavily with measurement uncertainties. This is layered on top of an ISO 9000 certification, which is a standard, used for total company quality system.
The 17025 standard requires that all functions within the scope of a given instrument must be tested and calibrated. Example: A Digital Multimeter would require a lab to have a scope that contained ALL of the functions that the meter can measure (AC volts, DC volts, Freq., Resistance, AC current, DC current, etc.) Only service providers that list all functions within the necessary scope can provide 17025 calibration for a given instrument.
Formerly MIL-STD 45662A, American National Standard ANSI / NCSL Z540-1 is a requirements document titled "Calibration Laboratories and Measuring and Test Equipment - General Requirements."
This is a standard that is used primarily by government community. It is very close to the 17025 standard.
A2LA is the American Association for Laboratory Accreditation.
A2LA accreditation is defined as formal recognition of an organization's technical competency to perform specific tests, types of tests, or calibrations.
The general requirements for laboratory accreditation are contained in ISO / IEC 17025. This standard contains quality system requirements and technical requirements that the laboratories must meet. Laboratory accreditation requirements, however, go beyond just ISO / IEC 17025.
Set of standards based on ISO 9001 with particular application to the automotive industry; standards are defined and maintained by major automotive manufacturers. Standards concern part fabrication and quality in areas such as materials, heat treatment, finishing, and production processes.
In 1987, the International Organization for Standardization (ISO) 9000 standards were developed to ensure that companies' products and services have consistent, documented approaches that meet the European community's quality requirements.
ISO 9001 sets out the requirements for an organization whose business processes range all the way from design and development, to production, installation and servicing.
In 1987, the International Organization for Standardization (ISO) 9000 standards were developed to ensure that companies' products and services have consistent, documented approaches that meet the European community's quality requirements.
ISO 9002 is for an organization, which does not carry out design and development. It does not include the design control requirements of ISO 9001 - otherwise, its requirements are identical.
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Companies are located in the Northeast United States, namely Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island and Vermont.
Companies are located in the Southern United States, namely Alabama, Arkansas, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, Missouri, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, Washington D.C., and West Virginia.
Companies are located in the Midwest United States, namely Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Nebraska, North Dakota, Ohio, South Dakota and Wisconsin.
Companies have facilities in South American countries such as Argentina, Brazil, or Chile; or in Central American countries such as Costa Rica, Honduras, Panama, etc.
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