The A*STAR’s National Metrology Centre (NMC) is the national measurement institute of Singapore, dedicated to advancing measurement science for an innovative and competitive economy
NMC establishes, develops, maintains and disseminates the national measurement standards traceable to the International System of Units, providing key support to a wide spectrum of industry.
Achieving the nation’s highest level of physical measurement through close collaboration with leading national and international organisation.
With a multidisciplinary team of experienced scientists and engineers and state-of-the-art facilities, NMC provides dedicated services to industry partners to meet their specific needs.
NMC believes in working in close collaboration with industry partners, to create values for them and fuel growth for the industry.
NMC currently maintains an ensemble of one hydrogen maser
and some caesium atomic clocks. They are regularly
compared with other atomic clocks in a global
network of time transfers via Global
Positioning System (GPS) Common-View. Time
data are continuously sent to the BIPM, which in turn
computes the International Atomic Time (TAI) and Coordinated
Universal Time (UTC) based on contributed data of
some 400 atomic clocks from the world.
The national time scale realised by NMC, designated as UTC(SG), was set
up in 1997. It is the local realisation of UTC
in Singapore. Through regular steering of the
frequency, the UTC(SG) is aligned to UTC
within 20 nanoseconds at all time. The Singapore
Standard Time (SST) is generated by advancing the UTC(SG)
by 8 hours to account for the time zone. The SST is
therefore aligned to the international time
Industry users and the public can access the national
time scale via NMC's time and frequency services in calibration
and computer time synchronization.
To obtain time-of-day information, several channels are available
for users to access the SST.
Network Time Service (NeTS)
This service enables computer and network users to synchronise
their computer clocks to time standard maintained at
National Metrology Centre (NMC) (adjusted to
the users' time zone) via the Internet.
Through NeTS, users will receive time code in
one of the following Internet timing protocols:
Time protocol, Daytime protocol or Network Time Protocols
(NTP). If choosing NTP which is the most commonly used,
users can synchronise their machine time with a
typical accuracy between 1-50 milliseconds
depending on the network traffic and quality
of the network service.
Automated Computer Time Service (ACTS)
A free dial-up service that enables computer users to receive
time code via an analogue modem and telephone line.
Dial-up software on different operating systems
is also freely available at the SST website.
Through the ACTS time code, users can easily and
automatically align their computer time to SST
with time transmission accuracy better than 500 milliseconds
for Windows, and 100 milliseconds for DOS system.
National Metrology Centre
1 Science Park Drive
T: +65 6279 1900
F: +65 6279 1992/1993
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