Image Engineering
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2.2 Minimum camera distance and positioning
For charts with complete transparent parts, please note the required minimum distance between the camera under
test and the LE7. If the distance is too short, the camera may capture parts of the light source within the integrating
sphere, which could cause irregular uniformity illumination in your image. The minimum camera distance depends
on the device's viewing angle under test.
Follow the steps below to ensure that the distance and position of your camera from the LE7 are correct:
1. Center your cameras axis of vision to the chart center point
2. Make sure the camera is not contorted on the chart plane
3. Remove the test chart and turn on a standard illuminant to a low intensity (< 200 lx)
4. Adjust the camera distance to the LE7 until you see the first row of both iQ-LED devices in the top
and bottom borders of the image
5. From this position, increase the distance of your camera to the LE7 so that both LED rows will move
out of the image; the minimum increase of distance should be 45 mm
6. Insert your test chart again and proceed with your test
When using a diffuse test chart for shading or uniformity measurements, you can move your camera directly in
front of the diffuser chart.
2.3 Using different test charts
When using different test charts, the measured values of your system could vary depending on the chart or filter.
Removing a chart will decrease the shown intensity but does not mean that your spectral arrangement or the
intensity of the LED device has changed.
We recommend recalibrating your LE7 and chart if you use test charts that are significantly different in
transparency or inside the reflection.
3 OPERATING INSTRUCTIONS HARDWARE
3.1 Overview display and ports
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1 x USB port for software control
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1 x port for power adapter
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1 x trigger output
