Resistance

Resistance laboratories provide the measurement traceability for resistance as well as development and maintenance of national physical standards for resistance. The laboratories provides calibration measurements with capability  from 1 mΩ to 1 TΩ. The National Standard of Resistance is a 1 Ω and 10 kΩ resistors kept in an oil bath at temperature of 23°C ± 0.001°C. The reference standard resistor is calibrated at BIPM on a regular schedule and disseminate to other resistors by using the automated DCC bridge at range of 1 mΩ to 10 MΩ. Resistance values below 1Ω achieved by using Direct Current Comparator Bridge with a Range Extender. The system has ratios up to 1000:1 with the relative uncertainty of 10-6. The resistance values from above 10 MΩ are scaled up using a modified Wheatstone bridge by replacing Resistive arms with 2 DC Voltage. The resistance laboratories dissemination, capability and uncertainty are shown in following table and diagram respectively. 

        

DC Resistance

:
  • Low range - 1 mΩ to 100 m Ω

  • Medium range - 1 Ω to 10 M Ω

  • High range – 100 MΩ to 1 TΩ

1

Best Measurement Capability

:

    ±0.5 mΩ/Ω to ± 585 mΩ/Ω

                                                            1  Ω standard resistor

DC Current  Shunt

:
  • 1 A to 100 A

 

Best Measurement Capability 

:     ±   5 mA/A to ± 100 mA/A   

2

Acoustics

a1aAcoustic Laboratory has developed high accuracy capability to support national acoustics measurement activities. The chart illustrates the traceability for acoustics measurement in Malaysia.

Slide1aaa

a1cThe highest standards are 1-inch laboratory standard microphone (LS1P) and ½-inch laboratory standard microphone (LS2P) that are maintained using Reciprocity Calibration System. The frequency range is from 20 Hz to 25 kHz with the best uncertainty of 0.04 dB at 1 kHz. 

 
 
   
<--- 1-inch and ½-inch laboratory standard microphone

Magnetics

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

 m1a

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.

m1m2m3m4

DC Helmholtz Coil 

Electromagnet

AC Helmholtz Coil 

Fluxmeter Calibrator 

DC Voltage

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

1

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.

1a1b1c
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

Email: irene@sirim.my , serviceNMIM@sirim.my

DID: +603 - 8778 1605

FAX: +603 - 8778 1616