- Wide measurement range, high accuracy 0.0-999,000lux +/-4%rdg
- Spectral response characteristics for visible range
- Good oblique incident light characteristics
- Excellent visible region relative spectral response---The relative spectral response of the lux meter shouldideally be the same degree of brightness as V(λ),which is the unit of brightness to which human beings are considered sensitive. In the JIS standard, the system ofevaluating the characteristics of the visible region relative spectral response is adopted in order to bring the relativespectral response of the lux meter much closer to thisideal. The following diagram shows the relative spectral response (typical response) of the 510 series lux meterwhich conforms to this system.
- Oblique incident light measurement--- To measure the intensity of illumination from a light source in anoblique direction accurately, there is a necessity that the angle of incidence to the perpendicular line from the target of the surfaceis in proportion to the cosine law.
- The 510 series lux meter measures the intensity of illuminationmore accurately because its sensitivity approximates to thestandard spectral luminous efficiency which is the same sensitivity as the human eye. However, since spectral characteristics differdepending on the light source types, a subtle indication error occurs.
- Average Illuminance Computation Function automatically calculate 4 or 5 points average of illumination.JIS C 7612 [Illuminance Measurements for Lighting Installations] describes how to calculate the average illuminance using the4-point and 5-point methods.
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