Image Engineering
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3.3 Starting the system
The power switch (F) is located on the upper side of the control unit.
3.3.1 Calibration
The LG3 has a stabilized intensity output, and the system needs to be calibrated to use the output
feedback in cd/m² or lux. The LG3 provides two calibration modes.
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Luminance calibration
: Luminance is a measure of the emission or reflection from a
flat surface in cd/m². For the LG3, the chart surface is measured, but the diffuser plate
is measured for shading measurements. Therefore, it measures the emission towards
the device under test (e.g., a camera system). Choose a reference point on the chart for
the calibration. When using an OECF chart, we recommend the field with the lowest
density.
•
Illuminance calibration
: Illuminance measures how much light illuminates a surface in
lux. It, therefore, measures the illumination directed at the light source and is not
suitable for a measurement on the chart.
Calibration menu
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Press buttons (B) and (C) simultaneously to enter the calibration menu
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Wait until the calibration reference value is measured; this will take a few seconds
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Switch between luminance and illuminance calibration mode by pressing the rotary
knob (A)
