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The Time and Frequency Standards Laboratory is a part of the National Physical Laboratory in New Delhi which maintains and calibrates the Indian Standard Time. Features of the Time and Frequency Standards Lab include: * Four caesium and rubidium atomic clocks * HF broadcast service operating at 10 MHz under call sign ''ATA'' to synchronise the user clock within a millisecond. This service has been discontinued as of today. * An innovative time service via telephone line known as ''Teleclock'' service was launched on 28 July 2009.〔http://www.nplindia.org/launching-mobile-teleclock〕 After successful commissioning this type of service in Nepal and Saudi Arabia, initiation of similar service in SAARC countries are being planned.〔http://www.nplindia.org/time-and-frequency-standards〕 * INSAT satellite-based standard time and frequency broadcast service which offers IST correct to ±10 microsecond and frequency calibration up to ±10-10. * Time and frequency calibrations are made with the help of pico- and nano-seconds time interval, frequency counters, and phase recorders. ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Time and Frequency Standards Laboratory」の詳細全文を読む スポンサード リンク
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