NIST's noise-temperature measurement service now available at continuous frequencies from 1 GHz to 65 GHz. (General Developments).NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. has completed the testing of the 1 GHz to 4 GHz units of its coaxial radiometer radiometer (rā'dēŏm`ətər), instrument for detection or measurement of electromagnetic radiation; the term is applied in particular to devices used to measure infrared radiation. (NFRad) and has reopened the noise-temperature measurement service for that frequency band. This marks the completion of a multiyear effort to restore and extend noise-temperature measurement services for coaxial and waveguide waveguide, device that controls the propagation of an electromagnetic wave so that the wave is forced to follow a path defined by the physical structure of the guide. noise sources. Noise temperatures of noise sources now can be measured at virtually any frequency from 1 GHz to 65 GHz as well as at two low-frequency points at 30 MHz (MegaHertZ) One million cycles per second. It is used to measure the transmission speed of electronic devices, including channels, buses and the computer's internal clock. A one-megahertz clock (1 MHz) means some number of bits (16, 32, 64, etc. and 60 MHz. Noise sources with common coaxial connectors can be measured up to 40 GHz, and wave-guide noise sources can be measured from 8.2 GHz to 65 GHz, with the exception of the 26.01 GHz to 26.5 GHz range of the WR-42 band. Noise sources with noise temperatures from about 50 K up to 15 000 K and reflection coefficients reflection coefficient n. Symbol  A measure of the relative permeability of a particular membrane to a particular solute. up to 0.2 can be measured. The typical expanded uncertainty (coverage factor of 2) ranges from about 0.9 % to about 1.8%, depending on frequency and connector type, for noise sources with noise temperatures from 1000 K to about 12 000 K and a reflection coefficient of less than about 0.1. CONTACT: Jim Randa, (303) 497-3150; randa@boulder.nist.gov. |
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