Time And Frequency

tf3NMIM’s Time and Frequency laboratory maintains two high performance and three standard performance Caesium (Cs) atomic reference frequency standards. One of the high performance Cs reference frequency standards is designated as Malaysian National Frequency Standards (MNFS), with accuracy of ± 5 × 10-13 s .

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 With these standards and continuous All-in-View GPS time comparisons, where the data is contributed to Bureau Weights and Measures (BIPM) for the generation of the International Atomic Time (TAT) scale. NMIM is capable to provide traceability to the SI Unit of time interval for time and frequency measurement.

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 Malaysian Standard Time (MST) is UTC (NMLS) + 8 Hours, due to the time zone selected which is the longitude of 1200 East. UTC (NMLS) is currently defined to be the epoch of the 1 pulse per second timing signal output at the rear panel of the Malaysian National Frequency Standards. NMIM steers the frequency of the standard to maintain UTC(NMLS) to be within approximately 1 ms of the Coordinated Universal Time (UTC).

Magnetics

m1bMagnetics Laboratory has developed high accuracy capability to support national magnetics measurement activities. The chart illustrates the traceability for magnetics measurement in Malaysia.

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Calibration of magnetic field measurement devices in the range of 0.1 mT to 20 mT performed in a Helmholtz coil.  An electromagnet used to generate DC magnetic fields and perform calibrations in the range of 100 mT to 1.6 T. AC magnetic flux density calibration is being offered in the range of 1 µT to 0.5 mT at 50Hz to 20 kHz. Calibration of fluxmeter is also provided in the range of 1 mWb to 10 Wb.

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DC Helmholtz Coil 

Electromagnet

AC Helmholtz Coil 

Fluxmeter Calibrator 

High Voltage

The high voltage and high current capabilities in the laboratory are described as follows:

Systems Parameter Capability Range Best Measurement Uncertainty (±)
Impulse high voltage Peak Voltage 50 kV - 500 kV 1.1%
Time 3.90%
AC high voltage AC high voltage 5 kV - 200 kV 0.66%
DC high voltage DC high voltage 5 kV - 150 kV 0.10%
> 150 kV - 270 kV 0.60%
Current Transformer Ratio Error Primary current: 5 A - 2000 A; Secondary current: 5 A 0.05%
Phase displacement 0.8'
Voltage Transformer Ratio Error Primary voltage: 3.3 kV - 11 kV; Secondary voltage: 110 V 0.05%
Phase displacement 0.8'

 

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Photometry

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Photometry and Radiometry Laboratory has developed high accuracy system to support national illuminance scale. Illuminance scale is one of the fundamentals in the realisation of candela in optical radiation. The chart illustrates the traceability for illuminance parameter measurement in Malaysia. 

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Measurement  range is start from 10 to 1000 lux with expanded uncertainty 1.1 %

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Reference standard photometer

DC Voltage

Voltage Laboratory has developed high accuracy capability to support national voltage activities. The chart illustrates the traceability for voltage measurement in Malaysia.

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The traceability of DC voltage standard to SI unit is realised by using Josephson Junction Voltage system in the range of 1 V, 1.018 V and 10 V with best uncertainty at 0.2 mV.

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JJV Systems Zener Voltage Standard 732B Zener Voltage Standard 7001

NMIM Info

NMIM plays an important role in disseminating the traceability of measurement to the whole country based on the International System of Units. Just like other world standard laboratories, NMIM has great responsibility in ensuring the national metrology infrastructures meet and comply with the global measurement standards.

Get In Touch

National Metrology Institute of Malaysia (NMIM)
Lot PT 4803, Bandar Baru Salak Tinggi
43900 Sepang
Selangor Darul Ehsan

Corporate inquiries:  irene@sirim.my , 03-87781605                          

Service inquiries:  serviceNMIM@sirim.my , 03-87781604                               

Complaint and feedback: feedbackNMIM@sirim.my

Training course request: NMIMtraining@sirim.my