Standard diffusor (ACC 032)
The pure spectraval 15x1 measures in spectral Radiance mode. It is possible to convert it into a spectral Irradiance meter by attaching a diffusor.

90° diffusor (ACC 032/90°)
The standard diffusor of the device acts in line to the device. If the Illuminance at a low height above a surface needs to be measured, then the 90° diffusor can be applied. It is also available with attenuation filters to extend the Illuminance measuring range (ACC 032 ODx.x).

90° remote diffusor (ACC 035-length)
If the measurement needs to be done under limited space conditions and the in axis fiber coupled diffusor is not suited, then the 90° fiber coupled diffusor can be applied. Different fiber lengths are available.

In axis remote diffusor (ACC 034-length)
If the measurement needs to be done in locations with limited space conditions then the remote diffusor can be used. It is a diffusor which is coupled to the spectraval device by an optical fiber bundle. The measurement is done in axis to the fiber bundle. Different fiber lengths are available.

Dome diffusor
The dome diffusor is equipped with a glass dom (silica for specbos 1211-UV-2) and it is IP67 tested. It can be mounted on roofs or outdoor walls and allows a detection of the optical sky radiation. The standard length of the fiberoptic bundle is 3 m, so also longer distances between the measuring location and the indoor position of the measuring device can be spanned.

Neutral density filter (ACC 033 OD1.0)
spectraval 15x1 can measure up to 100 000 cd/m² (typical white LED spectrum). An additional neutral density filter allows to shift the measuring range towards 10 times higher Luminance levels.

Dolby/realD filter cap pairs
The calibration of 3D projectors needs to be done through the right and left eye glasses. spectraval 15x1 can be equipped with caps containing the filters of Dolby (ACC 053) and realD (ACC 052) projection.  The usage of these filter pairs allows a precise measurement of 3D projections.

ACC Flicker
With the JETI flicker meter the light fluctuations of lamps, luminaires, monitors and projectors can be measured. The accessory can be easily attached to spectraval 1501 / spectraval 1511.

Imaging optics for small spot sizes
specbos 1211-2 and spectraval 15x1 in its standard configuration can measure in Luminance mode only with diameters of 4 mm and more. Applications as the measurement of small segments of displays or small sized OLEDs may need smaller diameters. Therefore, JETI offers three imaging optics to reduce the measuring diameter.

Special imaging optics for spectraval 15x1
In some applications it is necessary to create a specified measuring diameter in a specified distance. This can be realized with customer specific optics.

Beam shaping optics
It is not necessary to adjust the optics of spectraval 1511 in Radiance mode, the measuring spot is sharp at any distance and the viewing angle is always 1.8°. If a specific measuring spot diameter is required, this can be set by selecting the appropriate measuring distance. In some cases this is not possible due to space limitations, e.g. in production measurements or in special set ups. Therefore, different beam shaping optics are available.

Straylight protection tube (ACC 046)
The straylight protection tube prevents the influence of surrounding light on Radiance measurements. It is mainly used for display measurements. The fixed length of the tube is 16 cm.