Activities and Updates at the State Time and Frequency Standard of Russia
INSTITUTE OF METROLOGY FOR TIME AND SPACE MENDELEEVO (RUSSIA
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As it was announced, a campaign on the State Time and Frequency Standard modernization is under realization. A new prototype of the primary Cs fountain standard with an uncertainty of 3x10-15 is under metrological investigation, which is expected to be finished at the end of 2009. For today, we have two new ensembles each of four H-masers of type of CH1-75A with individual cavity auto-tuning systems. The whole instrumentation set includes distribution amplifiers, a frequency and time measuring system, and a real-time time scale generation and distributing system. All these instruments are installed in thermally and humidity controlled chambers. Typical temperature and relative humidity variations are well below 0.1 degrees C and approximately 1 respectively. As a result, the frequency stability of the H-masers on a 1-day basis is about few parts in 1016. The new remote clock comparison system consists of several multichannel dual-frequency GLONASSGPS TTS-3 receivers. All receivers have been differentially calibrated relative to a portable receiver as part of a calibration campaign arranged by the BIPM. A TWSTFT station is under construction in VNIIFTRI. The closest main goal is to arrange a time link to PTB and NICT via the IS-4 satellite. The same instrumentation set four H-masers, a frequency and time measuring system, and time transfer equipment will be installed in secondary laboratories in Novosibirsk, Irkutsk, Khabarovsk, and Petropavlovsk Kamchatsky.
- Test Facilities, Equipment and Methods