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Sector Star Test Chart (36 cycles)

Sector Star Test Chart (36 cycles) Instructions Operating Manual Sector Star Test Chart (36 cycles) PDF
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The YE0120 test chart is designed for the adjustment of camera lenses and checking back focal distance. It shows a 36 sector Siemens star on a white background.

The YE0120 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.

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

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

c) 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 use a haze meter, the device must first be calibrated and then it will display the haziness and transmittance values.

The most common standard measuring gloss is ASTM D523, which covers the procedures of using a gloss meter at 20°, 60°, and 85° angles. The other international standard that is widely used in industrial and laboratory applications is the ISO 2813.


Zero calibration of a hazemeter is a critical pre-measurement procedure to ensure the instrument’s accuracy by resetting its baseline to "zero" when no haze or light attenuation is present.

  1. Align the hazemeter’s measurement window with air or a black background, ensuring no objects block the window.

  2. Press the hazemeter’s zero calibration button and wait for the instrument to complete automatic calibration. At this point, the instrument should display a zero haze value and a zero light transmittance value.

  3. Observe the instrument’s display to confirm the zero calibration result stabilizes near zero. If the zero calibration is inaccurate, repeat the above steps multiple times until the displayed haze and light transmittance values stabilize near zero.

Perform 0-degree calibration before testing, this eliminates inherent instrument drift, environmental interference, or residual signal errors, ensuring subsequent measurements of transparent/translucent samples (e.g., plastic films，pvc, glass, coating, displays and cosmetic packaging) are reliable. Correct for minor instrument deviations caused by long-term use, temperature changes, or power fluctuations.

 A gloss test gauges the reflective quality of a surface by casting light at a fixed angle and measuring the amount reflected. It defines the level of shine or dullness of a surface, and it is very crucial in coatings, automotive, and product finishing


Depending on model and location, delivery time is usually 2-4 weeks for standard models and 4-6 weeks for built- to-order ones. 


Readings of gloss meters in gloss units (GU) are used to measure shine on the surface. Low GU (0-10) is matte, 10-70 semi-gloss or satin, and above 70 is glossy. Measurement angle is given to the readings: 60° is the normal, 20° is the high gloss, and 85° is the low gloss.


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