The spectral value curves of the CIE standard viewer are never achieved innately. Manufacturers use a monitor with a CCFL backlight and without an extended colour space as a basis for the corrections that are necessary (implemented in the colorimeter itself). This leads to considerable problems regarding measurements for monitors which emit a different spectrum. These include monitors with WCG-CCFL, White-LED and RGB-LED backlighting. In the high-end sector, relevant corrections are generally carried out in the software provided by the manufacturer and are calculated for the individual spectrum of the monitor used. From iColor Display 3.6, Quato also provides generic corrections for WCG-CCFL S-PVA and IPS panels.
Here, the X-Rite DTP94 is especially suitable as a colorimeter. Although it is relatively far from the CIE standard viewer innately, it demonstrates only small measurement deviations within the series. Thus, it can really benefit from corrections, without any selection by the manufacturer.