Group for time and frequency

Group for time and frequency is responsible for the realization of the SI unit of time – the second standard. The Group is engaged in research and development standards of realization SI units and derived units; development and facilitation of new methods in calibration and testing; improvement of metrology properties for national standards and methods; providing and maintain the traceability chain metrological properties for national standards and reference standards; recognition and approval of CMCs in the scope of Mutual agreement for national measurement standards and for calibration and measurement certificates issued by NMIs (MRA); preparation and adoption of metrology rules for measurement device for which verification is obligatory, such as type approval and verification of measuring instruments, and metrological expertise.

The Group also performs tasks related to the implementation of legal time distribution.

In the domain of scientific, industrial and legal metrology, the Group for time and frequency carries out calibration of standards, as well as testing of measuring instruments for the purpose of type approval of measuring instruments in the fields of time, frequency and speed.

The group's work is covered by integrated quality management and is carried out in accordance with all relevant technical standards.

Group for time and frequency develops and maintains national time and frequency standard.

Within the European Association of National Metrology Institutes – EURAMET, the group belongs to the Technical Committee for Time and Frequency (TC-TF).

Laboratories:
In Group for time and frequency there are laboratories for:

Calibration and Measurement Capability (CMCs)

Calibration and Measurement Capability (CMCs) for time and frequency are published in the database of the International des Poides et Mesures.

Projects
• CIPM MRA BIPM CCTF-K001.UTC, ongoing key comparison in time (Calculation of the reference time scale UTC (Coordinated Universal Time)), from January 2006
• BIPM Rapid UTC (UTCr), Rapid realization of the Coordinated Universal Time UTC, ongoing comparison, from March 2013
• EURAMET project 1519: UTC(k) definition point and reference delay measurement strategies, 2021-2022
• EURAMET project 1485 (TF-S1): Comparison of time interval measurements, 2021
EURAMET project 1152: GNSS receiver performance monitoring, ongoing from 2010 PT-V-TF-1-2020, July 2021
• PT scheme, Interlaboratory comparison “Calibration of function generators”, Protocol PT-V-TF-1-2018, October 2018
• PT scheme, Interlaboratory comparison “Calibration of frequency generators”, Protocol PT-V-TF-1-2017, July 2018
• BIPM Capacity Building & Knowledge Transfer Program – “Effective participation in Coordinated Universal Time (UTC)”, February 2018
• PT scheme, Bilateral comparison “Calibration of frequency stability”, Protocol PT-V-TF-2-2017, November 2017
• PT scheme, Bilateral comparison “Calibration of frequency generators”, Protocol PT-V-TF-4-2016, November-December 2016
• PT scheme, Bilateral comparison “Calibration of frequency generators”, Protocol PT-V-TF-3-2016, November 2016
• PT scheme, Interlaboratory comparison "Calibration of frequency generators", Protocol PT-V-TF-2-2016, October-November 2016
• BIPM G1G2_1011_2016 (BIPM calibrations of time transfer equipment)/ EURAMET project 1156, European GNSS link calibration campaigns in support of CCTF-K001.UTC - GPS calibration of BIM, UME, BOM, DMDM, IMBH, INRIM equipment with respect to ROA G1 (1011-2016), May 2016.
• Twinning project "Strengthening Capacities of National Quality Infrastructure and Conformity Assessment Services in the Republic of Serbia", IPA 2013 – SR 13 IB EC 01, Partners: Czech Metrology Institute (CMI), Czech Office for Standards, Metrology and Testing (UNMZ), Czech Institute for Accreditation (CAI), Activity 1.1.2: Support in review of the secondary legislation in force in the area of metrology, April-May 2016
• PT scheme, Interlaboratory comparison "Calibration of frequency generator", Protocol PT-V-TF-1-2016, January-February 2016
• EURAMET Focus Group on Facilitating National Metrology Infrastructure Development (EURAMET FG-FNMID) - "Training on Time and Frequency Dissemination In Packet - Oriented Networks" in Belgrade, organized by Euramet, PTB and DMDM, November 2015
• European Commission, Bilateral screening meeting with Serbia, Examination of the Preparedness of Serbia in the field of Chapter 14 Transport policy and Chapter 21 Trans-European networks, February 2015
• EURAMET project peer visits and reviews of QMSs in BIM and DMDM, Ref. 1208, started: 2011-11-01: Group for Time, Frequency and Time Dissemination of Directorate of measures and precious metals (DMDM), in the technical field of time and frequency, December 2011.
• PT scheme, Interlaboratory comparison: ²Calibration of frequency standards² (quartz clock standard), Protocol PT-V-EF-1-2011, June - July 2011.
• EURAMET project 1117, Survey of European countries' legal time regulations and practices, January-April 2011
Project EuropeAid/125357/D/SER/YU, Technical assistance to quality infrastructure institutions in the Republic of Serbia - Training on standards for international time scales and dissemination of time and frequency standards, July 2009.
• EURAMET project 1018, Survey of GNSS receivers in use for time transfer in T&F labs, January-March 2008
• EURAMET project 1017, Workshop for EURAMET T&F laboratories, March 2008.
• BIPM Relative characterization of GPS time equipment delays at the OP, AOS, GUM, LT, TP, BEV, OMH, NIMB, NMC, and ZMDM - Calibration of a GPS Receiver using the traveling TTS2 receiver, December 2006
• EUROMET supplementary comparison TF.TI-К1 "Comparison of time interval (cable delay) measurement", November-December 2005

List of professional papers
Published professional papers of time and frequency group metrologists

List of professional papers

Contact:

Head of Group for time, frequency and time dissemination
Snežana Renovica, dipl. inž.
phone: +381 66 860 4117
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Metrologst for time and frequency
Dragana Dragutinović, dipl. inž.
phone: +381 66 860 4078
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Address
Directorate for Measures and Precious Metals, Group for time and frequency
Mike Alasa 14,
11000 Belgrade
Republic of Serbia