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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
This Sector Star Test Chart (36 cycles) Instrument are Certified with
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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

The color measurement theory is the quantification of the interaction of materials with light, either absorption, transmission, or reflection. It employs standard colour spaces (such as CIELAB) and devices (colorimeters, spectrophotometers) to code the visual colour into objective and reproducible data.

For pharmaceutical tablet color accuracy & compliance (USP/EP/ICH/FDA), these 3nh spectrophotometers deliver superior precision:

1. TS8560 Benchtop (Lab/R&D – Highest Precision)

  • d/8° integrating sphere, SCI/SCE dual mode

  • ΔE*ab ≤ 0.01 (repeatability), IIA ≤ 0.1

  • Small apertures (Φ3mm/Φ8mm) ideal for tablets

  • Auto positioning, temp/humidity compensation

  • 21 CFR Part 11 software for audit trails

  • Best for: R&D, formulation, strict QC, coated tablets3nh TS8560 

2. TS8503 Benchtop (Mid-High Accuracy)

  • d/8°, dual CMOS sensor

  • ΔE*ab ≤ 0.018, IIA ≤ 0.24

  • Multi-aperture, camera view locating

  • Stable for batch-to-batch tablet consistency

3. ST70 Portable (Production/Field)

  • d/8° (SCI/SCE), ΔE*ab ≤ 0.02

  • Handheld, fast, non-destructive

  • Best for: line checks, incoming materials, small labs

4. NS800 (Cost-Effective QC)

  • 45/0 geometry, ΔE*ab ≤ 0.04

  • Rugged, touchscreen, easy QC

  • Suitable for uniform, uncoated tablets

Short Recommendation

  • Top lab accuracy: TS8560

  • Best value benchtop: TS8503

  • Portable production: ST70

  • Economical QC: NS800

All meet pharmaceutical standards for tablet color uniformity, coating consistency, and stability testing.


Samples should be cleaned, dried, and scratched-free to obtain consistent haze measurements.


A colorimeter is sufficient for basic, routine color checks, while a spectrophotometer is needed for precise, comprehensive color analysis—here’s the clear breakdown:

When a Colorimeter is Sufficient

  1. Simple color matching needs: Ideal for checking if a sample matches a predefined standard (e.g., basic paint batches, plastic parts with solid colors).

  2. Consistent lighting conditions: Works well when measurements are done under fixed, standard light sources (no need to account for varied light effects).

  3. Cost-sensitive, high-volume tasks: Perfect for production lines requiring fast, low-cost color checks without advanced data analysis.

When to Use a Spectrophotometer

  1. Precise color quantification: Necessary for measuring Lab values (lightness, red-green, yellow-blue axes) or detecting subtle color deviations (critical for automotive coatings, high-end textiles).

  2. Complex color analysis: Required for metallic/pearlescent finishes, transparent materials, or samples with gloss/texture variations.

  3. Compliance and documentation: Essential when precise color data (spectral curves) is needed for quality audits, regulatory compliance, or brand color standardization.


The gloss of the paint is defined by the measurement of light reflection at the surface of the paint with the help of a gloss meter. The angle and quantity of light reflected determine the level of gloss, with smoother and reflective surfaces having a higher level of gloss.


If there is uneven lighting, color shifts, and the light is not as bright as it was before, your lamps might have to be replaced. Recent light boxes used with Pantone, as well as Datacolor LightBooths, have usage timers that tell how long before a lamp needs to be replaced.


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