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Bar Test Chart(IEC 61146)

Bar Test Chart(IEC 61146) Instructions Operating Manual Bar Test Chart(IEC 61146) PDF
This Bar Test Chart(IEC 61146) Instrument are Certified with
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The bar test chart is designed for checking the transmission characteristics of TV cameras at intermediate and deep frequencies.

In the upper part of the picture 4 black horizontal bars of different length are arranged in a white surrounding. The lower part is a mirror image to the upper one; however white bars are arranged in a black surrounding. A narrow vertical strip of black and white each are located in the center of the picture. These strips resp. bars generate puls signals of approx. 2 µs, 5 µs, 12 µs and 32 µs.

UTILIZATION

Inadequate transmission characteristics at intermediate and deep frequencies generate streaking effects in scanning line direction. Streaking may also be caused by defective clamping circuits. Long streaking (high error-time-constancy) are clearly visible at the monitor. Short streaking (low error-time-constancy) can be better observed in the oscillogram. For this purpose an oscilloscope with a line selector has to be used and the different bars may be observed one after the other. Also the adjustment of streaking (e.g. compensation of afterglow of flying spot scanners) should be effected with the aid of picture monitor and oscilloscope.

The narrow vertical strips in the center of the picture show echo disturbances, as may occur e.g. with defective delay lines in circuits for aperture corrections. The large black and white areas in both parts of the picture are designed to asses shadings, background structure and other errors. For this purpose the test chart may also be used upside down.

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FAQs About  Other Charts

Gloss paint can be identified by visual inspection and using a gloss meter. The high gloss paints are shiny and reflective like a mirror, satin or eggshell has a soft sheen, whereas the matte paint is non-reflective with very little or no reflection.


Colorimeters is a color measurement device that are used to capture, communicate, and evaluate color. Colorimeters are more affordable, portable, and easier to use, making them a suitable choice for basic color measurement applications, ideal for quick and routine tests.

spectrophotometers offer higher precision and comprehensive data analysis, 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. You can choose the appropriate color measurement equipment according to your application needs.


The principle of colorimetry is the law of Beer-Lambert, which says that the intensity of light absorbed by a colored solution is proportional to the concentration of the absorbing species and the path length. It measures the extent of light that is absorbed at certain wavelengths.


There is no generic mathematical formula for gloss value. Rather, it is measured directly with a gloss meter, which compares how strongly reflected light from a sample matches a standard (typically black glass with a known reflectance).


 Color is measured using devices such as colorimeters, spectrophotometers, and spectroradiometers. Colorimeters are easier and good for simple color quality tests. Whereas spectrophotometers yield detailed spectral information. Hence, suitable for laboratories and industries.

a. Connect colorimeter to the PC with USB cable.

b. Turn on the colorimeter to enter main menu. Select "Comm" and press "Enter" key to start communication.

c. Right click on "My Computer" on the desktop. Click "Manage" -> "Device Manager" -> "Ports", you can see similar display as "SCI USB2Serial (COM6)".

d. Click "Settings->Communication Parameters" in CQCS3 software interface. Select the corresponding port in "Serial Port".

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