Uvp UVX Radiometer User Manual download pdf (Page 18)

UVX Radiometer 18

Figure 9: Typical Sensor Response Versus Incidence Angle

Calibration Traceability

For direct traceability to NIST standards, UVX sensors must be returned to the UVP calibrations

laboratory for calibration once every 6 months. UVP does not stand behind calibrations performed by

unauthorized companies.

UVX Series Sensors are calibrated by adjusting their response to match that of an UVP Transfer

Standard Detector when exposed to radiant incidence of the appropriate calibration wavelength from a

stable, effectively monochromatic source.

The calibration of UVP Transfer Standard Detectors is accomplished by measuring their response to a

stable, effectively monochromatic radiant source of the appropriate wavelength. The absolute radiant

incidence level from this source is set by simultaneously matching it with that of National Institute of

Standards and Technology (NIST) standard of spectral irradiance. This calibration is performed at UVP

calibrations laboratory a minimum of once every six months.

The NIST standard of spectral irradiance used by UVP is a 1000 watt tungsten lamp. This lamp is

replaced after every 20 hours of operation.

Period of Calibration

UVP recommends recalibration of the UVX Series Sensors every 6 months, especially when used by the

governmental agencies and in other areas of critical application.

NOTE: All sensors must be calibrated by the UVP calibrations laboratory for direct traceability to NIST

standards.

In non-critical applications, the user may choose a longer period of time between calibrations. However,

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Uvp UVX Radiometer User Manual Page 18