Because "CIE" primarily handles illumination (International Commission on Illumination), many assume CIE 542 covers photometry. This is a false cognate. In process control contexts, particularly in older European textbooks, CIE 542 is strictly analog signaling.
: Analyzing and correcting common mathematical mistakes made by elementary-level students.
Without a precise definition, let's consider what CIE 542 might encompass hypothetically: