QASUME is a travel reference UV spectroradiometer which allows intercomparison campaigns of global solar irradiance measurements from different instruments (array spectroradiometer, scanning spectroradiometer) to be conducted at the user’s site rather than at PMOD/WRC.


Stationary spectroradiometer-systems can be calibrated by a visit of the QASUME spectroradiometer. The visit usually lasts 5 days with two days needed for travel and setup time and 3 days for intercomparison between the host and the reference instrument. After a QASUME audit, a detailed report of the intercomparison and a calibration certificate are issued. It is recommended that a visit is repeated to ensure the long term stability of the system.

Qasume Audits since 2002

Locations of all Qasume audits. Click on the icon
to see the report of the visit.