hum

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Related to hums: Huns, UHMS

hum

Electronics an undesired low-frequency noise in the output of an amplifier or receiver, esp one caused by the power supply

Hum

 

the name given during the Middle Ages to the region between Dubrovnik and the Neretva River. The earliest surviving reference to Hum dates from the 10th century and describes the region as subject to the Serbian prince Mihajlo Višević. Late in that century the region became part of Samuil’s state, and in 1018 it fell under Byzantine control. Hum became part of Zeta in the second half of the 11th century, part of the Nemanja state in the late 12th century, and part of Bosnia in the 1320’s. Duke (herceg) Stepan Vukčić took control of Hum in the 1440’s. The duke’s dominions, of which Hum constituted a major part, became known as Hercegovina in the mid-15th century.

hum

[həm]
(electricity)
A sound produced by an iron core of a transformer due to loose laminations or magnetostrictive effects; the frequency of the sound is twice the power line frequency.
(electronics)
An electrical disturbance occurring at the power supply frequency or its harmonics, usually 60 or 120 hertz in the United States.
References in periodicals archive ?
5 millihertz, they said - a tighter range than the first hum researchers in the 1990s had recorded.
Additional FlyScan contracts are planned to conclude this year, and the companys objective is for FlyScan to become a standard service for the entire helicopter HUMS community.
Jean McLeish THROUGHOUT this summer Aberdeen people were asked to hum to help create a piece of music that will be showcased during the city's annual Sound Festival.
This partnership, which is the first Hums agreement in the region, is another way of expanding our comittment.
The proven performance, affordability, and demonstrated return on investment of IAC's advanced HUMS technology has resulted in what we believe to be one of the largest, single HUMS orders ever placed.
This partnership, which is the first HUMS agreement in the region, is another way of expanding our comittment, said Anthony Azar, Regional Director, Honeywell Aerospace, Through the TWA partnership Middle Eastern customers will benefit from shorter lead times on HUMS orders and maintenance services with local expertise and after-sales support readily available.
With more than 400 HUMS and two million flight hours, Smiths is the world leader in the supply of HUMS for both military and commercial helicopter applications," commented Dr.
Smiths' single box HUMS will provide increased aircraft safety, availability, reliability, maintainability and Life Cycle Costs.
Smiths is the largest supplier of HUMS products in the world with more than 300 systems installed, over 1.
and HUMS (Health Usage Monitoring System) Certification