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Metrology Laboratory

Photo of Solar Radiation Research Laboratory researchers inspecting radiometers mounted to calibration tables at the outside test site.

Researchers at the Solar Radiation Research Laboratory use pyranometers, pyrheliometers, pyrgeometers, photometers, and spectroradiometers to provide the solar resource information necessary for renewable energy research and development.

Metrology, the science of measurement, is a critical part of providing accurate and repeatable data. Researchers in the NREL Metrology Laboratory ensure that their measurements are traceable and their instruments are calibrated according to national or international standards.


The Metrology Laboratory provides World Radiometric Reference traceability for solar absolute cavity radiometers, pyrheliometers, pyranometers, and pyrgeometers.

The Metrology Laboratory also provides National Institute of Standards and Technology traceability for electrical:

  • Multimeters
  • Voltage sources
  • Calibrators
  • Frequency counters
  • Resistors
  • Capacitors
  • Amplifiers
  • Clamp-ons
  • Transducers (watt, voltage, and current)
  • Power supplies
  • Current sources
  • Oscilloscopes
  • Function generators
  • Current shunts
  • Lock-in amplifiers
  • Wattmeters
  • Data loggers.

In addition, the lab provides National Institute of Standards and Technology traceability for temperature probes and monitors, tachometers, pressure calibrators and gages, and balances.

Learn More

For information about using the NREL Metrology Laboratory, explore our Working with Us page.