General	Spectrometer Calibration Beamline Beamline 2 (BL-2) at SURF III is dedicated to spectrometer calibrations, and provides a standard source of irradiance from 4 nm to 400 nm. The XUV Detector Calibration Beamline at SURF III One of the beamlines (BL-9) at SURF III is dedicated to the calibration of transfer standard detectors in the XUV spectral region from 5 nm to 50 nm. Nuclear Power Industry NEI/NIST Measurement Assurance Program Nuclear Energy Institute (NEI) established a Measurement Assurance Program at NIST to provide sponsoring nuclear utilities, commercial suppliers of radioactive sources, and service laboratories independent verifications, traceable to NIST. Radiopharmaceutical Industry NEI/NIST Measurement Assurance Program Nuclear Energy Institute (NEI) and the National Institute of Standards and Technology have cooperated in a measurements assurance program in the field of nuclear medicine. Participation in the program allows sponsors an independent verification, traceability to NIST, of their capability to make accurate radioactivity measurements. Mammographic X-Ray Instrument Calibration Range The Ionizing Radiation Division in the Physics Laboratory has established new national standards for radiation exposure from x-ray beams used in mammography and has completed new facilities for calibration of exposure meters in these beams. Frequency Measurement and Analysis Service The NIST Frequency Measurement and Analysis Service makes it easy to measure and calibrate any quartz, rubidium, or cesium frequency standard. All measurements are made automatically, and are traceable to NIST at an uncertainty level of ±5 × 10-13 per day. Subscribers to the NIST service receive a complete frequency measurement system which includes everything needed to make state-of-the-art frequency measurements that are traceable to NIST. NIST Global Positioning System (GPS) Data Archive NIST continuously monitors the Global Positioning System (GPS) satellite signals from Boulder, Colorado and compares the frequency standard on each satellite to the NIST frequency standard. The results are published in the NIST GPS Data Archive. The archived data can be used to support claims of frequency traceability to NIST through the use of GPS, since the frequency uncertainty of each satellite is listed. You can use the archive to quickly check the status of the GPS constellation on any given date. New GPS data (from the previous day) are added to the archive daily at about 1600 UTC.
NIST Time Services	NIST Web Clock See a display of what time it is anywhere in the country. The reference for the clock is the NIST Time Scale in Boulder, CO. Automated Computer Time Service (ACTS) NIST's Automated Computer Time Service (ACTS) has been provided since 1988 to those users who need to synchronize computer clocks to the correct time. Using ACTS requires only a computer, a modem, and some simple software. When a computer connects to ACTS by telephone, it receives an ASCII time code. The information in the time code is then used to set the computer's clock. NIST Internet Time Service The NIST Internet Time Service allows users to synchronize computer clocks via the Internet. The time information provided by the service is directly traceable to UTC(NIST). The service responds to time requests from any Internet client in several formats including the DAYTIME, TIME, and NTP protocols.
Optical Technology Calibration Services	Low Background Infrared Measurements The LBIR Facility is available to service the user community to characterize infrared radiometric sources, detectors and optical components in a low background environment. The scientists at the facility will collaborate for special tests to measure infrared optical properties of materials, to characterize sources and detectors and to perform other experiments at cryogenic temperatures. Photodetector Measurements This service provides characterized silicon detectors and special tests of customer supplied detectors. Spectral responsivity and uniformity measurements are made on photodiodes, detectors, and radiometers from 200 nm to 1.8 µm. Photometric Measurements Various calibration services are now available for luminous intensity, total luminous flux, illuminance, luminance, and color temperature. Radiance Temperature Measurements Measurement of Radiance Temperature of Disappearing Optical Pyrometers, Ribbon Filament Lamps, and Radiation Thermometers provide access to the International Temperature Scale of 1990 (ITS-90). NIST disseminates the radiance temperature scale from 800 °C to 2700 °C by issuing ribbon filament lamp standards of radiance temperature and by calibrating customer supplied pyrometers and radiation thermometers. Spectral Radiance and Irradiance Source Measurements Spectral radiometric measurements of radiance and irradiance standards in the spectral region of 200 nm to 2400 nm are performed. Spectral irradiance standards are supplied by NIST in two forms: tungsten filament lamps and deuterium lamps. Special tests are available. Spectrophotometry Measurements of regular transmittance and specular or diffuse spectral reflectance from 250 nm to 2500 nm on submitted text items.