Operating Instructions
JETI spectroradiometer spectraval 15x1
Document Revision 105
6.5.2.3 Sync Frequency
If you want to measure modulated light sources (typical examples are TV monitors and
PWM modulated LED’s), it is necessary to synchronize your device to the repetition
rate, because spectraval devices are very sensitive. Otherwise the results, especially
of bright sources, will fluctuate significantly. If the repetition rate of the display lies in
the order of magnitude of the measuring time of the instrument, the repeatability of the
measurement will be poor. To do this, use the Sync Determine Sync Freq Button be-
low. The frequency setting can be adjusted manually between 16 Hz and approximately
2000 Hz. If the sync measurement fails, it can have the following reasons:
• The instrument is positioned too far from the light source.
• The influence of the surrounding light or other light sources is too significant.
• The source is not modulated (note that some monitors do not fluctuate in intensity
if their brightness control is set to maximum).
6.5.2.4 Change Calibration
The NFC sensor in the measuring head recognize the accessory attached to the de-
vice automatically. The software will use automatically the appropriate calibration file
if the attached accessory is compatible with the device. By default, the first position is
reserved for the Luminance mode measurement without an accessory.
Remark: If the NFC-sensor is disabled, always make sure that the right calibra-
tion file is selected, to obtain correct measuring results.
JETI spectraval 15x1 are delivered in a calibrated status. The calibration data are saved
in the device. A separate file exists for each measuring mode and each accessory.
The menu point Change Calibration displays the following options:
You can choose between the calibration data that are saved in the device. Each calibra-
tion data is described with the measuring mode (Radiance, Irradiance, Radiant flux or
Radiant intensity) and a remark.
26 Copyright © 2017 JETI Technische Instrumente GmbH
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