1540 Strobolume by General Radio Corporation - separate control box and strobe on tripod

General Radio Company (later, GenRad) was a broad-line manufacturer of

electronic test equipment Electronic test equipment is used to create signals and capture responses from electronic devices under test (DUTs). In this way, the proper operation of the DUT can be proven or faults in the device can be traced. Use of electronic test equipmen ...

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, U.S. from 1915 to 2001.

History

On June 14, 1915, Melville Eastham and a small group of investors started General Radio Company in

Cambridge, Massachusetts Cambridge ( ) is a city in Middlesex County, Massachusetts, United States. As part of the Boston metropolitan area, the cities population of the 2020 U.S. census was 118,403, making it the fourth most populous city in the state, behind Boston, ...

, a few blocks northwest of

Massachusetts Institute of Technology The Massachusetts Institute of Technology (MIT) is a private land-grant research university in Cambridge, Massachusetts. Established in 1861, MIT has played a key role in the development of modern technology and science, and is one of th ...

. During the 1950s, the company moved to

West Concord, Massachusetts West Concord is an unincorporated village and census-designated place (CDP) in the town of Concord in Middlesex County, Massachusetts, United States. The population was 6,028 at the 2010 census. Geography West Concord is located at (42.454747, ...

, where it became a major player in the

automatic test equipment Automatic test equipment or automated test equipment (ATE) is any apparatus that performs tests on a device, known as the device under test (DUT), equipment under test (EUT) or unit under test (UUT), using automation to quickly perform measurements ...

(ATE) business, manufacturing a line of testers for assembled

printed circuit board A printed circuit board (PCB; also printed wiring board or PWB) is a medium used in electrical and electronic engineering to connect electronic components to one another in a controlled manner. It takes the form of a laminated sandwich str ...

s. It also produced extensive lines of electrical component measuring equipment, sound and vibration measurement and RLC standards. In 1975, the company name was changed to GenRad. In 1991, a startup QuadTech was founded as spinoff of GenRad's Instrumentation division and Precision Product lines, as well as the rights to use the "GenRad" and "General Radio" names. In 2000, IET LabsIET Labs - About.
/ref> acquired from QuadTech the GenRad RLC standards, impedance decades, megohmmeters, digibridges, audio lines, stroboscope lines. Then in 2005 IET Labs purchased the Digibridge and Megohmmeter lines, which continue to be manufactured in

West Roxbury, Massachusetts West Roxbury is a neighborhood in Boston, Massachusetts bordered by Roslindale and Jamaica Plain to the northeast, the town of Brookline to the north, the cities and towns of Newton and Needham to the northwest and the town of Dedham to th ...

. In 2001, Teradyne acquired the GenRad board test system lines, which were relocated to Teradyne's corporate campus in

North Reading, Massachusetts North Reading (pronounced, as is with Reading as () is a town in Middlesex County, Massachusetts, United States. The population was 15,554 at the 2020 census. History The area was first settled in 1651 when the town of Reading received a special ...

. Among General Radio's accomplishments over the years have been: * The introduction of one of the world's first portable

oscilloscope An oscilloscope (informally a scope) is a type of electronic test instrument that graphically displays varying electrical voltages as a two-dimensional plot of one or more signals as a function of time. The main purposes are to display repetiti ...

s. * The production of many high-precision standards for

inductance Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The flow of electric current creates a magnetic field around the conductor. The field strength depends on the magnitude of th ...

, resistance, and

capacitance Capacitance is the capability of a material object or device to store electric charge. It is measured by the change in charge in response to a difference in electric potential, expressed as the ratio of those quantities. Commonly recognized are ...

. * The production of the

stroboscope A stroboscope, also known as a strobe, is an instrument used to make a cyclically moving object appear to be slow-moving, or stationary. It consists of either a rotating disk with slots or holes or a lamp such as a flashtube which produces br ...

as the ''Strobotac''. * The production of the

sound level meter A sound level meter (also called sound pressure level meter (SPL)) is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The best type of microphone for sound level meters is the condenser microphone, whic ...

. * The ''Variac'' variable autotransformer, which was a U.S. trademark of General Radio from 1934 to 2001. * Invention of the "five-way" binding post connector. * Invention of the GR connector.

History

See also

References

Further reading

External links