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Sector Star Test Chart (72 cycles)

Sector Star Test Chart (72 cycles) Instructions Operating Manual Sector Star Test Chart (72 cycles) PDF
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The YE0121 test chart is designed for the adjustment of camera lenses and checking back focal distance. It shows a 72 sector Siemens star on a white background.

The YE0121 test chart is designed for

  • adjustment of camera lenses

  • checking back focal distance

 
With the aid of a low transmission filter and by means of low level lighting make sure that the camera is not over modulated with the aperture in the open position.

  1. Optical focus: Adjust focus of zoom lens at greatest focal length.

  1. Back focal distance (lens): Adjust focus at shortest focal length by regulating lens mechanically with adjustment screw and optimize alternatively with a).

  1. Back focal distance (pick-up tubes): If focus varies from channel to channel between greatest and shortest focal length, the individual pick-up tubes must be adjusted mechanically in the optical axis.

 

  1. Select white channel. Set optical focus at greatest focal length. With shortest focal length and divergent focus adjust the pick-up tube in W-channel until optimum focus is achieved. If necessary optimize by alternating with optical focus adjustment.

  2. With unchanged optical focus adjustment and shortest focal length adjust the red and blue pick- up tube until optimum focus is achieved. Image focus (focus adjustment) is maintained at all focal lengths (zoom-in) and constant distance from object by means of back focal distance adjustment.

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FAQs About  Other Charts

To extend the life of a haze meter, keep the instrument dust-free and clean, regularly calibrate it, and control for a stable dry storage. For better results, avoid letting the optics dry, and leave the meters under sunlight. For optimal performance, have the meter professionally serviced once a year.

Record the L*a*b values of the sample and the reference with a calibrated spectrophotometer or colorimeter. Compute the difference in the color by use of ΔE. The lower the Delta E, the more accurate the result. The difference in energy, ΔE < 1, is generally assumed to be invisible to the eye.


Follow the calibration steps form 3nh. Don’t touch the sample and drop the measurement light to eliminate external light.


a. It’s needed to perform manual calibration for NH310 when first starting.

b. In the subsequent starting, NH310 will perform auto calibration at startup. No need to perform manual calibration.

c. Suggestion: it’s best to perform manual calibration once a week or when NH310 measured data is not accurate.

D65, TL84, A light, CWF, and UV are the most common standardized sources used for precise color matching.

You should not attempt measuring on surfaces that are dirty, oily, or rough, as these surfaces will not provide an accurate reading. Always calibrate the paint thickness tester and make sure to select the proper probe for the substrate as well. Proper execution will bring about consistency as well as trustworthiness to the readings.


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