frequency and time standard造句

• Other early products included WWVB frequency and time standards which offered atomic clock accuracy at a fraction of the cost.
• The NIST-F2 caesium fountain clock operated by the National Institute of Standards and Technology ( NIST ), was officially launched in April 2014, to serve as a new U . S . civilian frequency and time standard, along with the NIST-F1 standard.
• In 2011, the NPL-CsF2 caesium fountain clock operated by the National Physical Laboratory ( NPL ), which serves as the United Kingdom primary frequency and time standard, was improved regarding the two largest sources of measurement uncertainties  distributed cavity phase and microwave lensing frequency shifts.
• It has a range of responsibilities including generating and disseminating Japan's national frequency and time standards; conducting type approval tests of radio equipment for the Global Maritime Distress Safety System ( GMDSS ) and marine radar based on Japan's Radio Law; and providing regular observations of the ionosphere and space weather.