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Indian Time Today

Indian Standard Time (IST)

ATA, the time signal, is controlled by the National Physical Laboratory.

ATA - Time Signal

The National Physical Laboratory, located in the capital New Delhi, is the premier research laboratory of India in the field of physical sciences. Established in 1947, it is one of the oldest laboratories of the Council of Scientific and Industrial Research.

Time at Facilities The National Physical Laboratory, India

Time and frequency measurements, the calibration services offered to users at NPL include:

Caesium and rubidium atomic clocks

HF broadcast service operating at 10 MHz under call sign ATA to synchronise the user clock within a millisecond

INSAT satellite based standard time & frequency broadcast service offers Indian Standard Time correct up to ±10 microsecond and frequency calibration up to ±10-10.

The ATA and INSAT systems provide time synchronization and frequency calibration on a continuous basis.

Equipment Used for Calibration The National Physical Laboratory

The time and frequency standards at NPL are maintained with the help of four atomic caesium standards

Time and frequency calibrations are made with the help of pico- and nano-seconds time interval and frequency counters and phase recorders.

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