What is a glossmeter
What is a glossmeter?
Gloss meter is an instrument used to determine the surface gloss of ceramics, paints, inks, plastics, marble, aluminum, hardware and other materials. High precision gloss meter is divided into three types according to the angle: high gloss, medium gloss and low gloss.
Principle of glossmeter
The light source G emits a beam of light through the lens L1 to reach the measured surface P, the measured surface P reflects the light to the lens L2, the lens L2 converges the beam to the photocell located at the light bar B. The photocell carries out photoelectric conversion and sends the electrical signal to the processing circuit for processing, and then the instrument displays the measurement result. The unit of glossiness, according to JIS, is sufficient in % or numbers. In addition, the record, in principle, should be clear to determine the angle measurement instrument manufacturer name model.
First: gloss is a physical quantity that evaluates the ability of a material surface to reflect light under a set of geometrically specified conditions, with direction-selective reflective properties. We usually say gloss refers to the “mirror gloss”, so gloss meter is sometimes called “mirror gloss meter”. Gloss and machining industry, “gloss” or “roughness” concept is completely different, the latter is the continuation of the material surface micro-unevenness.
Second: the measurement principle of gloss meter is shown in the figure below. The measuring head of the instrument consists of an emitter and a receiver. The emitter consists of an incandescent light source and a set of lenses, which produces a certain required incident light beam. The receiver consists of a lens and a photosensitive element to receive the cone beam reflected back from the sample surface.
The mirror gloss is a relative measurement of the mirror gloss. The reference standard is a black glass with refractive index np=1.567, whose plane is assumed to be specularly reflected from the plane to the natural beam when an ideal polish is obtained, and defines the gloss value at this point as 100.0 gloss units. Glossy plates are further divided into high, medium and low according to the gloss value. High gloss plates are made of black optical glass or other materials. Medium gloss and low gloss plates are made of glazed ceramic or frosted black optical glass. Gloss meter uses the principle of light reflection to measure the gloss of the sample. Namely, the sample is irradiated at a specified angle of incidence and a specified beam of light, and the reflected light in the direction of the reflection angle of the mirror is obtained.
The fluctuation theory can be used to qualitatively explain many optical properties of materials. According to the fluctuation theory, it is possible to derive the ratio of the energy W of the incident light passing through the unit area per unit time to the energy flow W of the reflected light.
W1 sin2（i-r） tg2(i-r)
—— = [——————— + ——————]
W02 sin2（I+r） tg2(i-r)
In the formula:
- i a angle between the incident light and the normal (angle of incidence);
- r a refraction angle.
Gloss is the nature of the object’s surface directed selective reflection, the surface presents different bright spots or the formation of overlapping objects on the surface of the image. Gloss is the ability of the surface to reflect light when the object is illuminated by light, usually expressed as the specimen in the direction of the mirror (positive reflection) relative to the standard surface reflectance multiplied by 100, that is, G = 100R / R.
In the formula: R – the reflectance of the specimen surface; R. – the reflectance of the standard plate. The refractive index of soda D-rays is 1.568 with polished perfect black glass as the reference standard plate, and the specular gloss is calibrated to 105 gloss units for each geometric optical condition.
Features of gloss meter
- 1. It can measure the surface of different materials from plastic to metal and has a wide measurement range. Glossiness range is: 0-200GU (under the measurement condition of 20 degrees).
- 2. It is possible to measure the gloss difference by standard value/sample value display or PASS/FAIL evaluation, and it is also possible to achieve the function of PASS/FAIL by setting the limit difference value.
- 3. You can select basic mode and statistical mode for measurement in the mode selection menu.
- 4. You can choose the angle you need to display in the measurement angle interface, you can choose two or choose to display three angles at the same time.
- 5. You can input the names of standard and sample values in the measurement results for easy identification.
- 6. Automatic diagnosis function of calibration.
Classification of gloss meter
Gloss units are generally expressed in “GU”. High gloss 60 degrees of gloss is higher than 70GU, low gloss 60 degrees of gloss is lower than 30GU. specific breakdown of gloss is divided into the following categories: high gloss (70%), semi-gloss (30%-70%), eggshell light (6%-30%), flat (2%-6%), no light (less than 2%). The above glossy gloss data are based on the gloss data of the 60 degree instrument test. Therefore, the 60 degree instrument is a “universal instrument”.
Types of gloss meter
Gloss meter according to the different incidence angle can be divided into: 20 degrees, 45 degrees, 60 degrees and 85 degrees. In the domestic gloss standard, the most used is mainly 20 degrees, 60 degrees and 85 degrees. From a functional point of view is mainly divided into single-angle, dual-angle and three-angle. In addition manufacturers manufacture instruments with different ranges according to the needs of different user groups. The common ranges are 0-200GU, 0-1000GU, 0-2000GU, etc. Some manufacturers can also customize for customers according to their special industries.
Why is there an angle in the measurement of glossiness?
We need to judge the glossiness of an object in our daily life from the same angle, otherwise the size of glossiness is different for different observation angles of the same object. When measuring if the selected angle of incidence is larger, then the greater the specular reflectivity will be, the higher the gloss, and conversely the smaller the angle of incidence, the lower the specular reflectivity will be, and the lower the gloss will be. Glossiness is actually a ratio, which is the ability of the surface to reflect light when the object is irradiated by light, usually expressed as the specimen’s reflectance in the specular (positive reflection) direction relative to the standard surface multiplied by 100, i.e. G=100R/R.
Click “Calibrate”, the display will remind to put the calibration plate box, make sure the instrument and calibration plate box are stuck tightly, click “OK” or press “Switch/Measure button” to calibrate.
The instrument must be calibrated when there is a change in the operating environment (e.g., when there is a drastic change in temperature, altitude, humidity, etc.). To ensure accurate calibration, use the standard board provided by the original manufacturer. Dust on the standard plate will affect the calibration effect. Before calibration, please wipe the working surface of the standard plate with a wipe cloth to make sure the working surface is clean.
The standard plate is a precision optical component, so avoid exposure to light and keep it properly. Due to environmental factors, the photometric data of the standard plate will change over time. Therefore, we recommend that you send the standard plate back to the original factory or a qualified metrology institute for calibration testing on a regular basis (recommended once a year).
Notes on the use of glossmeter
- 1. Before using the gloss meter needs to be calibrated, when changing the measurement environment also needs to be calibrated (mainly refers to the temperature, humidity changes too much environment), the gloss meter calibration plate needs to be calibrated once a year, by the product manufacturer or a qualified institution for calibration.
- 2. Gloss meter calibration plate has a bar code, the bar code serial number needs to match the bar code serial number on the instrument host, that is, the gloss meter instrument host can only be used with the calibration plate that comes with the factory, different gloss meter calibration plate can not be mixed;.
- 3. Gloss meter needs to be maintained with care, disassembly, collision, dropping and contact with liquid and other actions are strictly prohibited, please turn off the machine and remove the battery for a long time.
- 4. In the measurement before, need to set a good gloss meter measurement angle, so as not to measure the results do not meet the measurement requirements or have a large error.
Glossiness value is the larger the surface brighter?
Generally speaking, the larger the gloss value represents the brighter the surface of the object. However, there are two cases, one is the same measurement angle, the greater the gloss value obtained the brighter, if it is a different angle, it is not necessarily. In addition, the gloss level of an object’s surface is fixed, which is a physical parameter of the object itself and will not change because of the external environment. But the brightness of the surface of an object changes according to the brightness of the irradiated light, so usually gloss and brightness are not mentioned together.
What is the meaning of gloss unit GU?
GU is the abbreviation of the English word GLOSS (Chinese meaning: gloss, brightness) and the English word UNIT (Chinese meaning: unit, unit), which is translated into Chinese to mean: gloss unit. So how should it be read for GU? As the weight (total weight) of the English abbreviation is GW, gloss unit GU how to read? Directly read the English pronunciation G and English pronunciation U together can be read. In the process of glossmeter use, we also find that there will be GS such abbreviation, gloss unit GS and GU relationship is what? In fact, gloss English word GLOSS (Chinese meaning: gloss, bright) on the abbreviation GS, give an example is clear their relationship, for example, gloss GS is 90GU. so gloss unit GU should be directly after the value.
What is the difference between gloss meter GU and GS units?
In China, we usually say how much gloss, for example, if the gloss is 60°, it can be understood as 60GS or 60% gloss. What does GS / GU mean? The unit of gloss meter is called gloss unit. According to the JIs standard, gloss units can be expressed as a percentage sign or a number.
Gloss symbol GS and GU relationship
Gloss in English gloss, abbreviated as GS. Gloss unit in English, glossunit, abbreviated as GU. so we say gloss is GS, and gloss unit is GU.
For example, gloss meter DR61 measuring range is 0-199.9GS, the range of measuring gloss is 0 to 199.9 meaning.
Gloss meter has many names, and different industries call it different. There are gloss meter, gloss meter, photometer, portable gloss meter, portable gloss meter, gloss meter, gloss meter, gloss meter, gloss meter, gloss detector and other names. All are instruments dedicated to measuring the glossiness of an object’s surface.
Glossiness calculation method.
Surface gloss GS (θ) should be calculated according to the following formula.
- GS (θ) = φs/φos*Gos (θ)
Where φs is the reflected luminous flux on the surface of the specimen relative to the set incidence angle θ
φos: is the reflected luminous flux of the standard surface relative to the set angle of incidence θ
Gos (θ): the standard surface gloss used (%)
Gloss is the nature of directional selective reflection from the surface of an object, which presents different bright spots on the surface or forms an image of the object overlapping on the surface. Gloss is the ability of the surface to reflect light when the object is irradiated by light, usually expressed by the specimen in the direction of the mirror (positive reflection) relative to the standard surface reflectance multiplied by 100, that is, G = 100R / R.
R in the formula – the specimen surface reflectivity, / R. – the standard plate reflectivity. Polished perfect black glass as a reference standard plate, the refractive index of its soda D ray is 1.568, for each geometric optical conditions of specular gloss calibrated to 105 gloss units.
Specular gloss symbol values
Specular gloss meter, the ratio of the reflected luminous flux of the sample in the specular reflection direction to the reflected luminous flux of the glass specimen in that specular reflection direction under the specified light source and receiver tension angle conditions. The value of specular gloss of polished black glass with refractive index of 1.567 is set to 100 (gloss unit) at a geometric angle of 60 degrees.
So the gloss measurement is a comparative measurement method, i.e., the sample is tested under the same conditions relative to a mirror image gloss standard plate. The same conditions means that the angle of incidence is certain, the default light source is stable, and the sample (or standard plate) is irradiated with a beam of light under the specified conditions in the direction of mirror reflection to receive the reflected beam under the specified conditions.
National standards for glossiness
A gloss meter 20 ° reference standards: DIN-67530 , ISO-2813 , ASTM-D2457 GB 9754 , GB 8807 , ISO-8254 , ASTM -D523, which is mainly used for high gloss ink, paint, paper, plastic, stone, light cast coated paper and so on.
Second, gloss meter 45 ° reference standards: ISO-2767, GB 8941.2, ASTM-D2457, ASTM-C346, GB 8807, which is mainly used for marble, ceramics, plastics, aluminum alloy and aluminum oxide surface measurement and so on.
Third, the gloss meter 60 ° reference standard ISO-2813, DIN-6750, ASTM-D2457, ASTM-C584, ASTM-D523, GB 9754, GB 8807, GB 9966. GB 8807, GB 9966 Its main use in glossy coated paper, marble, ceramics, paint, ink, plastic and so on.
Fourth, the gloss meter 85 ° is ISO-2813, DIN-67530, ASTM-D523 GB9754 its mainly used for camouflage coating, low gloss paint and so on.
Does color have an effect on the glossiness of the object?
In JJG 696-2015 standard, the calibration plate for calibration of gloss meter, its main component is polished black glass, not polished red glass, polished blue glass. Also in GB/T 8941 2013 Paper and cardboard Determination of specular gloss, it is mentioned that the difference between the color of the specimen and the diffuse reflectance ratio has little effect on the determination of gloss. So from the factors of paint gloss, and the points of polished black glass in the calibration plate, the object surface color has some influence on the gloss, but it is not the final main influencing factor and can be almost ignored. Here we need to pay attention to: the color of the object surface material and the object color are somewhat different, for example, the appearance of the car looks red, but its surface coating is crystal glass coating, it is no color, so only through this layer of film to see the color of its lower layer of paint.
What are the common high gloss objects in life?
Vehicles are common high gloss objects in our lives, in addition to stainless steel products are also high gloss, but because the substances inside the stainless steel will react with air and water vapor to form a protective film, which can further prevent stainless steel corrosion, stainless steel gloss will change from the very beginning of the very new very shiny to lose part of the gloss, and then for example, the appearance of many plastic products is also high gloss, which This point is related to the high gloss products are easily accepted.
The gloss of the object surface is mainly related to the roughness of the object surface and the material of these two factors, generally speaking, the lower the roughness, the smoother the surface of the object the higher the gloss will be (provided that the same observation angle, general gloss measurement angle of 20 °, 45 °, 60 °, 85 ° four, of which 45 ° will be less, related to the measurement of gloss gloss gloss gloss instrument is also much less); the object itself Material also has a great influence on its surface gloss, for example, the gloss of wood is no matter how it is compared to the gloss of electroplating, crystal plating, glass.
What does the size of gloss meter value represent?
For the gloss of the object surface, many partners do not understand very well, when customers ask to test the gloss, for the instrument to detect the gloss value size also has no concept, I briefly introduce the gloss and the meaning of the mirror gloss meter measurement value.
Gloss is a characteristic of the surface of the object, we often say that the surface gloss of the object refers to, the surface of the object’s ability to reflect light specularly. This is a relative measurement of the ability of an object to reflect light specularly under a set of specified geometric angle conditions.
If the surface of an object is smooth enough, when a parallel beam of light is directed at a plane mirror, it will still reflect in one direction in parallel, and this type of reflection is called specular reflection. In real life, metal, porcelain, mirrors, etc. have a high degree of surface smoothness and their specular reflection of light is strong.
For the measurement method of gloss, the common method is to detect by gloss meter, the gloss meter used here is also called mirror gloss meter. It is composed of structures such as incident light emitter, receiver, standard plate, etc. The gloss is measured with reference to a black glass with refractive index np=1.567, assuming that its plane is specularly reflected by the plane to the natural light beam under the condition of getting ideal polish, and defining the gloss value at this time as 100.0 gloss units. Then under the same conditions, the reflected luminous flux of the object surface divided by the reflected luminous flux of the standard plate, so as to find out the relative value of the gloss of the object surface.
The meaning of gloss value
When we understand the gloss measurement method, and then look at the meaning of the gloss value, it is not difficult to find that this is a standard plate as a benchmark, measured by the dimensionless, to be precise is the object by light irradiation when the surface of the reflectivity of light and the standard surface reflectivity ratio, the formula for G = 100R/R, the formula G for gloss (gloss) abbreviation, R is the surface of the object respectively to light reflectivity and standard plate surface to gloss reflectivity. Here the standard plate is defined as 100, so it is multiplied by 100.
What are the units of haze? How are the results of haze meter tests expressed?
Object surface gloss value is generally expressed in GU gloss unit, which is the abbreviation of English gloss unit, translated as gloss unit. Let’s say: If there is no unit of mass (kilogram or whatever), we can call a certain mass the unit of mass, the unit of mass is: mass unit.
Gloss unit, according to JIS, the unit of gloss is % or number can be.
How to understand the value of gloss standard plate?
Gloss measurement is largely related to the value of the standard plate, the ideal state of the refractive index of 1.567 black glass, the gloss is defined as 100.0 GU, and the actual instrumentation in the production process, it is not possible to achieve such accurate requirements, the standard plate of each instrument whose refractive index is somewhat different.
So we use glossmeter before, randomly to glossmeter calibration. The standard plate used for calibration here, its value will be clearly marked. For example, the gloss meter calibration plate, its gloss in 20 ° measurement should be 95.7, 60 ° measurement gloss should be 97.3, 85 ° measurement gloss should be 99.7. instrument calibration, only three angle detection all through, can be regarded as gloss meter calibration success, otherwise analysis of gloss meter failure reasons, re-calibration.
The larger the gloss value the brighter the surface?
Generally speaking, under the same measurement conditions, this statement is true, but in different measurement angles, the measured gloss is deviated. For example, the gloss meter calibration plate above, the same surface, the greater the angle of incidence, then the measured gloss value will be larger. So gloss values can only be compared with each other under the same gloss meter unified conditions, if the measuring instrument and measuring angle are not consistent, then the measured gloss values cannot be compared with each other.
Therefore, when users need to test the gloss of the product, they need to choose the same gloss meter as well as according to the specified angle for measurement.
Gloss meter for use environment and use method
Many users in the use of gloss meter if not pay attention to the changes in the surrounding environment, then it may lead to serious deviations in the measurement results. This article brings you the requirements of the gloss meter using the environment, the need to test the items of gloss friends can come to see!
Gloss meter using the environmental requirements
Gloss meter is a precision optical instrument specifically used to detect the surface gloss of objects, so for the use of the environment is also a certain requirement. Should try to avoid the use and storage of gloss meter in a humid, strong electromagnetic interference, strong light, dusty environment, if used, may cause an explosion, fire.
It is recommended to use and store the instrument in a standard laboratory environment (temperature 20 degrees Celsius, 1 standard atmosphere, humidity 50~70% RH).
The standard plate equipped with the glossmeter is a precision optical component, so it should be properly stored and used, avoid bumping the working surface with sharp objects, avoid dirtying the working surface with dirt, and avoid exposing the standard plate to strong light. Regularly clean the standard plate with a soft wipe cloth dipped in alcohol.
Do not disassemble the instrument, otherwise it will destroy the instrument, there may also be dust, metal foreign bodies into the interior of the instrument, the instrument may short circuit, produce electric shock, resulting in the destruction of the instrument, or even cause a fire.
During the use of the instrument, if the instrument emits burnt and other odors, should immediately stop using, and the instrument to the maintenance point for testing and repair.
Switch on and off
We introduced the gloss meter only a measurement key, but also the switch key. Long press the measurement key until the indicator lights up, display the power-on LOGO, and then wait a little, the instrument will enter the automatic measurement link. (If the instrument has not been used for a long time, or if the usage environment has changed drastically, it needs to be recalibrated.)
If the instrument is not used, press and hold the measurement key to turn it off. Without indulging in other operations, the instrument will also automatically shut down after a period of time.
This is a very important part of the gloss meter, if the instrument calibration does not pass, then your measurement results are certainly inaccurate. And calibration of the key factors instrument internal objective factors, the main thing is the standard plate, if the standard plate has stains, then the calibration guidelines are difficult to pass. So the usual maintenance time, you need to pay attention to the storage environment.
Now the digital glossmeter is more and more intelligent, the user can choose the mode is also very much, different modes can meet different users of a variety of measurement needs, you can choose according to their own needs.
As it is measuring the gloss of the surface of the object, the gloss of different areas of the same object may be the same, in order to better express the average gloss of the surface of the object, it is necessary to take points on the surface of the measurement sample to measure, usually will be measured several times to take the average value.
How to choose the right gloss meter? What is the difference between gloss angle 20/60/85°?
Measuring the gloss of a material surface requires the use of a gloss meter, which measures the reflectivity of the surface of an object to light, i.e., specular gloss. The angle of incidence chosen for the measurement is different and the result is different.
Gloss meter type according to the light source incidence angle is different, mainly 20 °, 45 °, 60 °, 75 °, 85 ° different angles. The mainstream standards involving gloss testing in China are mainly 20°, 60° and 85°.
How to choose the angle of gloss measurement?
We often do not know how to choose the gloss measurement angle when using gloss meters. All light sources reflect off the surface and the grade of the amount of reflected light is called the surface gloss value. Gloss value is measured in gloss units (GU), which corresponds to a standard value of approximately 100 GU. Gloss can be divided into 3 general ranges: low gloss, semi-gloss and high gloss.
According to the current industry summary rule is to use 60° as the reference angle to choose gloss meter, in addition, you can also choose according to the industry implementation of the standard.
If the gloss > 70GU, belongs to the high gloss, choose 20 ° measurement.
If the gloss <10GU, belongs to the low gloss, choose 85 ° measurement.
This helps to improve the measurement accuracy and resolution of high and low gloss parts.
For ordinary object surfaces, most choose 60° measurement, so the gloss meter with 60° angle is also called general-purpose gloss meter.
Some customers purchase 20°/60°/85° tri-angle glossmeter to facilitate research and development, which can measure three angles and display the value at the same time, or can be set to single angle measurement.
Glossometer mean value, maximum value, standard deviation effect
In the previous article, we talked about the difference between gloss meter standard sample and sample, what is the significance for users. So let’s talk about glossometer mean, maximum, minimum, standard deviation what does it do?
Average means the average of measurements calculated for a complete statistical record. To put it simply, the gloss value of each part of the sample surface may be different, but in order to better describe the gloss value of the sample, we choose to use the average value to express, which is relatively objective, rather than select the gloss value of a certain point to represent the gloss value of the whole sample.
The maximum value refers to the maximum value of a complete statistical record. Statistically speaking, the sample we measured has sampling times, and the maximum value here refers to the maximum gloss value of all sampled point species, which can not fully represent the whole sample, because there may be higher values.
Minimum The minimum value of measured data in a complete statistical record. The sample representation of the minimum and maximum values is consistent and not repeated.
The difference means that the glossiness meter measures the difference between the standard sample and the sample gloss, the difference can be positive or negative, the size of the difference indicates the sample gloss value and the difference between the sample gloss value.
Standard deviation data distribution reference
Standard deviation, also known as standard deviation, is the most commonly used in probability statistics as a measure of the distribution of statistical data. Colloquially, it refers to the degree to which all data in a measured sample deviates from the average. Most of the time, the smaller the standard deviation, the better, because the value representing the data measurement has little fluctuation, which is very good for quality control, also said that the production process of the product is very stable. Of course, there are also some cases where a higher standard deviation is better, representing the breadth of the data. For example, in the examination, we hope to have a large standard deviation, so as to screen out better candidates as possible. If the standard deviation is very small in this case, it’s going to be very difficult for us to make a choice on the exam, because we’re all very similar, we’re not very representative. Of course, this example does not fully consider such policy factors. Examples mainly focus on understanding, don’t need to be too tangled.
Note: the above standard sample, standard deviation, difference and conclusion need to turn on the difference switch.
The measured value mainly refers to the value obtained by the current instrument measurement, which can also be expressed as a single value of sample sampling measurement.
In the process of using glossometer, we need to pay attention to the role of each value in the measurement display data, so that the data we measure can have application significance. Generally, above average, maximum and minimum values, standard deviation and demographic data, have some similarities and difference with the color color difference values, statistically less using the difference between this concept, because statistics is mainly to study sample integrity more rarely pay attention to the differences of individual, so customers need little attention to the application and significance of difference.
The correct way to maintain gloss meter calibration plate
Glossometer calibration plate is a very important optical element, do not only regard it as glossometer measuring port protection cover. So, what is the correct way to maintain the glossometer calibration plate?
Improper cleaning method and precautions of calibration plate:
- 1. It is forbidden to use metal-containing articles to clean the glossometer calibration plate;
- 2. It is forbidden to use some common clear liquids such as detergent to wipe the glossometer calibration plate;
- 3. It is forbidden to wash the calibration plate with ordinary water or alcohol;
- 4. It is forbidden to expose the calibration board to sunlight for a long time;
- 5. It is forbidden to contact other objects or expose the working surface of the calibration plate to dust and humidity.
- 6. the calibration plate plastic protection box at school on time, but also to prevent the outside light into the instrument calibration more accurate, so the plastic box also need to be protected.
Correct way to clean calibration plate:
- 1. If there are stains or dirt on the surface of the glossometer calibration board, it should be wiped gently with cleaning liquid or wiping paper;
- 2. If the cleaning liquid is used to wipe, the liquid on the surface of the calibration plate needs to be dried in the shade, or dried in the non-scorching sun;
- 3. If there is dust on the surface of the glossometer calibration board, then you can use a hair dryer for processing, do not use hands or other cloth wipe.
- 4. The standard moment of the calibration plate processing: the standard plate can be immersed in hot water and light washing liquid (can not use soap), gently scrub with a soft brush. Then, the washing liquid on the surface of the calibration plate is rinsed with hot water of nearly 65°, and finally rinsed with distilled water, and then placed in an oven of about 70° for drying.
The correct way to maintain gloss meter calibration plate:
- 1. Gloss work standard plate is not used in a closed box, keep clean, prevent its surface from pollution or damage.
- 2. When holding the standard plate, try to hold it at the edge of the standard plate, and do not touch the working surface of the standard plate of glossiness meter.
- 3. The refraction index of the high gloss standard board will decrease year by year, and the calibration accuracy will change. So the surface needs to be tested or re-polished to restore it to its original state.
- 4. Protect the calibration plate, can not let it have a drop, collision, scratch, exposure behavior, the calibration plate determines the calibration accuracy of the instrument, the protection of the calibration plate is also the protection of gloss instrument.
Glossometer calibration plate use and maintenance matters needing attention, how to correctly clean the calibration plate we are introduced here. The most important component of the calibration plate is the black glass on the plate. It is based on the VERIFICATION Regulation of JJG 696-2015 Mirror Direction Glossiness Meter and Glossiness Plate. The reference standard is the black glass with refractive index nD=1.567. The higher the refractive index, the higher the glossiness.
FAQ of Gloss meter
Which working plate is used to adjust the gloss meter during daily measurement?
You should use the high light board to adjust the gloss meter, after adjusting can be measured. If the use of medium (or low light) board for adjustment, often cause a large measurement error.
In the light (or low light) what is the role of the working plate?
Medium light (or low light) work plate is usually made of high-quality white ceramic plate, used for gloss meter calibration. Calibration means that after adjusting the instrument on the high light plate (usually black glass), the glossmeter is placed on the medium light (or low light) plate to verify the correctness of the plate and the current state of the instrument. Glossmeter calibration is generally carried out when the instrument is used for a period of time or when there is doubt about the measurement results, without the need for calibration before each measurement.
Work plate and gloss meter due to improper operation and storage and other reasons, resulting in the work plate plate and gloss meter lens surface is tarnished or wear, unknowingly to the measurement of a large error. Through the calibration can be found in time to correct the problem, to avoid operational errors.
The calibration found two work plate gloss value can not be?
Newly purchased gloss meter this problem is often the two work plate plate surface is not clean, with a soft cloth or medical cotton ball dipped in anhydrous ethanol gently wipe clean the work plate surface can be.
If the gloss meter has been used for a period of time, first according to the above operation to exclude the plate surface tarnishing problem, once the problem remains, then to see whether the gloss meter has underpressure indications lead to abnormal work, in addition to this can be identified as the work of the board gloss value has changed (is one of the change or two are changing can not be determined), must be re-calibrated. At this time should be sent to the whole set of gloss meter to have the legal public measurement unit for calibration.
Gloss meter is not stable, soon after the value of the adjustment and run off?
The battery is about to run out, the display of undervoltage, at this time due to insufficient power supply gloss meter can not work properly.
Source: China Gloss Meter Manufacturer – www.spectrumgfa.com
www.spectrumgfa.com is one of the leading china Colorimeter & Spectrophotometer Manufacturer, with professional factory. We focus on the colorimeters, spectrophotometers, haze meters, gloss meters and spectral analysis instruments research and development, manufacturing, sales and service since the company been established. Our products is widely used on Painting,textile,plastic industry,food,building material and other products.
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