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​Calibrations and Measurements

​​​​​​​​​The following accredited measurement and calibration services are available at NMISA:​​

Acoustics Ultrasound and Vibration (AUV) Section

The Vibration Laboratories are SANAS accredited (facility number 1600), and offers the following calibration services:

  • Calibration of vibration transducers:
    • Complex sensitivity (magnitude & phase)
      • 0,1 Hz to 20 kHz (primary methods)
      • 1 Hz to 10 kHz (by comparison to a reference transducer)
  • Shock sensitivity calibration of vibration transducers by comparison to a reference transducer
    • 50 m/s2 to 2 500 m/s2
    • 2 km/s2 to 50 km/s2
  • Vibration analysers and vibration measuring instruments
    • 3 Hz to 10 kHz (0,1 m/s2 to 200 m/s2)
  • Human vibration (hand/arm and full body) monitoring instruments.
  • Seismic monitoring equipment
    • 3 Hz to 200 Hz
  • Charge/conditioning amplifiers
  • 0,1 Hz to 20 kHz
  • Force transducers
  • 10 Hz to 10 kHz
  • Impact hammers​

​DC Low Frequency and Radio Frequency

The Section offers measurement, calibration, training and consultation services as listed below:

  • DC Voltage: Calibration of DC reference standards at 1 V, 1,018 V and 10 V reference and DC voltage sources & meters from 100 mV to 1 kV.

  • DC Resistance: Calibration of DC resistance standard sources and meters from 10 µΩ to 1 TΩ.

  • Capacitance: Calibration of capacitance standard sources and meters from 1 pF to 10 µF in the 1 kHz to 1 MHz frequency range.

  • Inductance: Calibration of inductance standard sources and meters from 100 µH to 10 H in the 100 Hz to 1 kHz frequency range

  • AC-DC voltage transfer, AC voltage: Calibration of AC-DC voltage difference standards, AC voltage sources and meters in the corresponding nominal and frequency ranges (2 mV to 1 kV, 10 Hz to 1 MHz).

  • AC-DC current transfer, AC current: Calibration of AC-DC current difference standards, AC current sources and meters in the corresponding nominal and frequency ranges (2 mA to 100 A, 10 Hz to 100 kHz)

  • AC Power and Energy: Calibration of active, reactive and apparent power and energy meters in the ranges of 30V to 480V, 10mA to 160A and for power factors -1 to +1.

  • Radio Frequency power: Calibration of calibration factors for coaxial RF power sensors at 0,001 mW – 10 mW (100 kHz – 5 GHz) and absolute power for coaxial RF power meters and sources at 1 mW  at 50 MHz and 0,1 µW -30 W at 100 kHz to 2 GHz)

  • Radio Frequency Impedance: Calibration of Voltage Reflection Coefficient (VRC) or Return Loss for single-port and multi-port devices for different coaxial connector sizes such as Type-N ( 75 Ω, 0 -1) at 30 kHz to 2 GHz, PC-7 (50 Ω, 0 -1) at 30 kHz to 18 GHz, PC-3.5 ( 50 Ω, 0 – 1) at 30 KHz to 26.5 GHz, PC-2.4 (50 Ω, 0 – 1) at 50 MHz to 50 GHz BNC and balanced lines (CF)

  • Calibration of transmission coefficient in coaxial line for different coaxial connector sizes such as Type K (50 Ω, 0 dB to 60 dB) at 45 MHz to 40 GHz, PC-2.4 (50 Ω) 0 dB to 90 dB at 45 MHz to 50 GHz AND Type N; PC-7; PC-3.5 (50 Ω) 0 dB to 110 Db at 30 kHz to 26.5 GHz

  • Radio Frequency Attenuation: Calibration for RF attenuation is performed for various attenuators with different connector types including Type N, PC-7, PC-3.5 ( 50 Ω; 75Ω) 0 dB to 110 dB at DC, Type N(50 Ω; 75 Ω) 0 dB to 110 dB at 30 MHz, Type N; PC-7; PC-3.5 (50 Ω ) 0 Db to 110 dB  at 30 kHz to 26.5 GHz ,

  • Calibration of reflection measurement 124 Ω to 600 Ω from 50 Hz to 620 kHz, attenuation measurement 150 Ω , 0 dB to 80 dB from 6 kHz to 5 MHz​

Fibre Optics ​

  • Fibre optic power (e.g. fibre optic power meters, return loss meters)

  • Wavelength (e.g. OSA, fibre optic sources, LED, FP laser, wavemeter, return loss meter)

  • OTDR loss scale deviation (e.g. OTDR)

  • OTDR distance scale deviation and location offset (e.g. OTDR)

  • Optical length (e.g. fibre reels, fibre standards)​

Gas Laboratory​

  • Calibration of ozone measuring instruments

  • Calibration of indoor air quality monitors​

  • Calibration of evidential alcohol breath analysers

Mass Laboratory​ 

Accredited Calibration Services

  • Mass pieces (up to OIML class E1 accuracy)

  • Weighing instruments

  • Volume measures including micropipettes

  • Density of liquids and solids

  • Hydrometers

Other services include:

  • Surface tension measurements for liquids

  • Custom-made practical and theoretical training in Mass and Volume metrology. 

Temperature and Humidity Laboratory Services​

  • Calibration of contact thermometers from -196 °C to 1555 °C:

    • platinum resistance thermometers (PRTs) can be calibrated from -196 °C to 660 °C.
    • thermistors from 0 °C to 60 °C.

    • thermocouples from -80 °C to 1555 °C and

    • liquid-in-glass thermometers from -25 °C to 280 °C.

  • Calibration of infrared radiation thermometers from 0 °C to 1600 °C and blackbody radiation sources from 0 °C to 2000 °C.

  • Traceability for contact thermometry is obtained from thermometric fixed point cells from the triple point of argon (Ar) (-189.344 2 °C) to the freezing point of copper (1084.62 °C). (Pt-Rh thermocouples are calibrated at the melting point of palladium (1553.5 °C) using the wire-bridge method.

  • Development of calibration methods and transfer traceability to industry and African NMIs.
  • Dissemination of temperature scales by calibration of temperature sensors.

  • Provide a link between the African region and the rest of the world’s NMIs through comparison measurements in temperature and humidity.

  • Fixed points calibration of standard platinum resistance thermometers from Ar to Al points.

  • Calibration of other contact thermometers in the temperature range from -80 °C to 1600 °C.

  • Fixed point calibration of thermocouples in the temperature range from Sn to Pd points.

  • Calibration of surface thermometers in the temperature range from 0 °C to 450 °C.

  • Calibration of radiation thermometers and blackbody radiation sources from 0 °C to 2000 °C.

  • Calibration of hygrometers, saturated salt solution and humidity-related measuring equipment from 5 %rh to 95 %rh.

  • Calibration of dewpoint meters from -75 °C to +70 °C.

  • Calibration of water activity meters from 0,05 aw to 0,95 aw.

  • Traceability for radiation thermometry is obtained from contact thermometers up to 500 °C and from a spectrally characterised monochromatic radiation thermometer calibrated at the freezing point of silver (961.78 °C) or copper (1084.62 °C) from 600 °C.

Time and Frequency

  • Frequency (e.g. oscillators)

  • Time Interval (e.g. time delay generators, stopwatches, timers)

  • Rise- and fall-time (e.g. pulse generators, oscilloscopes)

  • Phase angle (e.g. phase angle meters, gener​ators)

  • Rotational speed (e.g. tachometers)


Photometry and Radiometry services

The Photometry and Radiometry section can perform the following measurements and calibrations:


  • Luminous intensity of tungsten lamps

  • Averaged luminous intensity of LED sources

  • Illuminance responsivity of illuminance/lux meters, or photometers

  • Luminous flux of tungsten lamps and LED sources

  • Illuminance and luminance of sources

  • Luminance responsivity of luminance meters

Properties of detectors:

  • Spectral power responsivity of broadband detectors

  • Spectral irradiance responsivity of broadband detectors*

  • Spectral radiance/irradiance responsivity of spectroradiometers

  • Optical/laser power responsivity of laser power meters

  • Broadband irradiance responsivity of broadband detectors*

  • UV broadband irradiance responsivity of UV-A, UV-B and UV-C (UVGI) meters

  • Bilirubin broadband irradiance responsivity of Bilirubin meters

Spectral emission properties of sources:

  • Spectral irradiance of various sources

  • Spectral radiance of various sources

  • Spectral radiant flux of various sources*

Spectral properties of materials:

  • Regular and diffuse spectral transmittance of e.g., shade netting

  • Diffuse spectral reflectance

  • Regular spectral absorbance of e.g., neutral density filters

  • Wavelength of filters

Spectrally-integrated measurements for sources and detectors:

  • Correlated colour temperature (CCT) of tungsten lamps and LED sources

  • Correlated colour temperature response of spectroradiometers or photometers

  • Emitted colour of sources (chromaticity coordinates)

  • Colour rendering index (CRI) of LED sources

  • Chromaticity response of colorimeters

Colour and other spectrally-integrated measurements of materials:

  • Surface colour*

  • Transmitted colour*

  • Gloss

  • Luminance factor of e.g., white diffusers, reflective sheets*, and number plates*

Other measurement services:

  • Luminous efficacy of LED sources*

  • Power factor of various sources*

  • LED peak, centroid and dominant wavelengths*​

  • Ultraviolet germicidal irradiance (UVGI) e.g., disinfection devices*

  • Illuminance and UV-A irradiance of photostability chambers*

* Non-accredited service

For a detailed list of accredited measurement and calibration services, refer to our laboratory's South African National Accreditation System (SANAS) Scope of Accreditation: Our laboratory also offers custom and non-accredited services, which may be discussed upon request.

​We can also offer advice on your photometry and radiometry questions during product development or the research phase of your lighting or radiometry project. Please contact us to discuss your needs and how we can be of service.​