AVR200 and AVR300 User Guide
7.3 Illumination Strategy
Once the image has been properly focused and magnification has been set, adjust light levels as necessary using the slider controls in M3 software. The right lighting is paramount to accurate measurement with any video-based measurement system. Lighting that is too dim will result in a dark, low-contrast image with indiscernible features. Lighting that is too bright may result in a washed-out image and blooming, or oversaturated bright regions that distort features. When adjusting lighting, start with light that is lower than desired, and then increase lighting while viewing the image on the monitor. Maintain constant lighting for consistent results. Always use the same light level while sampling points for a single feature – do not to change light levels during a measurement run. Depending on the part characteristics and the feature being measured, the right combination of lighting can aid in bringing out a particular feature. Take time to experiment by balancing the available light sources. Once the best illuminations settings have been found, illumination should be under full computer control along with CNC motion.
Light Options
The AVR system includes the following LED adjustable lights: ring light, substage light, coaxial light, dome light, and quad ring light. The quad ring light is available with manual height adjustment or motorized height adjustment, both over 150 millimeters (6 inches).
7.4 Focus Strategy
Always work at best focus. Focus is determined by adjusting the horizontal Z distance from the lens to the workpiece. Following are guidelines for setting focus:
• To set focus, move the stage from front to back until you find the two points on both sides of the point of best focus where the image just starts to defocus. The point of best focus will be approximately midway between these two points.
• When using zoom optics, first focus the image at highest magnification, then decrease the magnification to the desired level.
7.5 Verifying the Setup of the System
Before using the system to measure parts, verify the following steps to ensure proper mechanical and measurement functions:
1. Check that the operator controls and M3 software are running properly. Refer to “System Operations” earlier in this document.
2. Check the lighting controls. Refer to “Illumination Strategy” earlier in this section.
3. Check the system optics and ensure the optics are appropriate for the measurement being performed. Refer to “Understanding Measurement Strategy” earlier in this section.
4. Check that the general operating condition guidelines are observed. Refer to “Daily Inspection” later in this document.
5. Check parfocality, parcentricity, and squareness. See “Optical Alignment Verification” in the Section 8.
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