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

Vibration

vaVibration Laboratory has developed high accuracy capability to support national vibration and shock measurement activities. The chart illustrates the traceability for vibration measurement in Malaysia.

vb

vc The highest reference standard established is laboratory standard accelerometer B&K 8305 that is maintained using Laser Interferometry Calibration System. The frequency range is from 5 Hz to 10 kHz with the best uncertainty of 0.4%. 

Reference standard accelerometer B&K 8305

 

 

Photometry

p1

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. 

p2

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

p3

Reference standard photometer

RF & Microwave

RF power and scattering parameter or S-parameter are the quantity associated with microwave measurements where the services are offered by the laboratory to support national RF and microwave measurements activities. Measurement frequency capability starts from the range of 10 MHz up to 18 GHz. The measurements are limited to Type N and PC7 connectors. The estimated uncertainties for RF power and S-parameter are described as follows:

Parameters

Uncertainty (±)
RF power at 1 mW 2.0 % to 2.4 %
Reflection Coefficient 0.015
Attenuation 0.2 to 3.5 dB

 

rf1rf2rf3

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