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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

Colorimeters are more affordable, portable, and easier to use, making them a suitable choice for basic color measurement applications, spectrophotometers are better for research, development, and when dealing with complex or highly precise requirements. The biggest difference is in capability and usage. Spectrophotometers are incredibly powerful and can offer more in-depth color measurements than a colorimeter, such as spectral data.

Colorimeters are primarily used for color quality control, while spectrophotometers are used for analysis and formulation.


A light booth for color matching usually contains D65 (daylight), TL84 (store), A (incandescent) and UV light. LED may also be used in modern time for additional color matching. 


A colorimeter is sufficient when measuring similar materials or batches with stable conditions. Suitable for fast, low-cost color checks where high precision is not required. Quick quality control in plastics, paint batch consistency, food color grading (e.g., fruit ripeness), and basic printing checks.

A spectrophotometer is recommended when you need professional, maximum color accuracy or when testing materials with variable surfaces – such as glossy or textured samples. Like textile dye formulation, cosmetic shade matching, medical device color calibration, high-end printing (e.g., packaging for luxury goods), and material spectral research. learn more Understanding Spectrophotometric Parameter Measurement


The haze meter test assesses the degree of light scattering that occurs when light traverses a transparent or translucent material, producing a percentage that quantifies example or cloudiness.

Many people might answer "with the human eye", but this is actually not comprehensive. The human eye cannot accurately distinguish the colors of similar objects. Furthermore, everyone's perception of color varies. Therefore, people have developed color measurement tools based on the CIE color system. 

Currently, there are two main types of commonly used colorimeters, as follows: 

Colorimeter - It is an ideal choice for quality control (QC) on production lines, used to detect color differences. 

Spectrophotometer - It is suitable for the development of color characteristics and color analysis in laboratories.

The photoelectric integral color‑measuring instrument is what we commonly refer to as a photoelectric colorimeter. It obtains color tristimulus values through one‑shot integral measurement, featuring fast measurement speed and low cost, yet its absolute accuracy is inferior to that of a spectrophotometer. It works well for quick color‑difference comparison. For sophisticated color analysis or color formulation, a spectrophotometer is recommended instead.

How it converts color into digital values

At its core, this type of instrument simulates human color vision. Filters work together with detectors to convert optical signals into electrical signals and then calculate numerical values.

  1. Light strikes the sample, and reflected light enters the instrument.

  2. Filters split the light into three channels: red, green and blue, corresponding to three photodetectors respectively.

  3. Detectors measure the light intensity of each channel. The instrument directly computes tristimulus values X, Y, Z as well as chromaticity coordinates.

  4. The matching performance of optical filters is critical. Better compliance with the Luther condition delivers higher measurement accuracy.

Differences from spectrophotometers

Both instruments measure color, yet they serve quite different application scenarios.

Photoelectric colorimeter: Simple structure, compact size and easy operation with fast measurement speed. It can only test color difference instead of spectrum, and its absolute accuracy is limited, with chromaticity‑coordinate error around ±0.03.

Spectrophotometer: Light is dispersed and measured wavelength‑by‑wavelength. It provides high accuracy (chromaticity‑coordinate error up to ±0.001‑±0.003) and can acquire spectral reflectance curves. However, it comes with higher cost, complicated structure and relatively slower measurement speed.

Suitable application scenarios

Photoelectric colorimeters are preferred for routine production inspection, quick comparison and cost‑sensitive projects.

  • Textile printing & dyeing: Rapid color matching and color‑difference comparison

  • Plastics, coatings and printing: Spot‑checking color consistency on production lines

  • Field‑testing scenarios: Handheld models support on‑site measurement

  • Budget‑limited projects: Photoelectric colorimeters are cost‑effective with sufficient practical functions


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