ISFH Solar irradiance sensors – PV testing & calibration

Calibration of solar radiation sensors

Radiation sensors are essential for accurate performance analysis of photovoltaic modules and solar cells. ISFH develops and calibrates high-precision sensors that provide reliable data on solar irradiance. These measurements form the basis for efficiency evaluation, long-term PV testing, and validation of new solar technologies. Whether in solar simulator calibration, module benchmarking, or research on photovoltaic performance, our sensor technology ensures consistent and meaningful results.

Our calibration services at a glance

• Irradiance sensitivity measurement
→ Sensor response at defined irradiance levels (e.g. 100, 500, 1,000 W/m²)

Spectral responsivity (SR) measurement
→ Wavelength-dependent sensitivity in accordance with IEC 60904 standards
Measurement uncertainties & traceability
All calibrations are provided with full uncertainty specifications.
Our primary references are calibrated by the Physikalisch-Technische Bundesanstalt (PTB), Germany’s national metrology institute.

Calibration under standard testing conditions

Standard calibrations are performed at:

25 °C sensor temperature
1,000 W/m² irradiance
AM1.5G spectrum (AAA solar simulator)

Calibration at variable irradiance levels

For sensors with non-linear response characteristics, we offer calibrations at intensities ranging from 200 to 1,200 W/m².

Spectral mismatch correction

To minimize measurement uncertainty, spectral mismatch correction is essential.
That’s why spectral responsivity (SR) determination is a key part of our calibration procedure.