Display modes on the Elcometer 480 Glossmeter
The Elcometer 480 Glossmeter features a fully customisable, scratch and solvent resistant colour LCD, allowing the user to display Gloss, %Reflectance or Haze measurements, statistics, trend graphs and much more.
The gloss meter’s display is designed around an innovative split screen system that allows the user to choose any two sub screens to display at once, at the top or bottom of the display.
Single, dual and triple angle readings
The readings screen displays up to three angle geometries at once, such as Gloss at pre-defined measurement angles, %Reflectance at different angle geometries and Haze.
Gloss, %Reflectance and Haze explained
All three angles should be recorded (20, 60 & 85°) when measuring gloss on anodised metals to ensure a complete understanding of the specular reflectance between the coating and the metal substrate.
%Reflectance compares the amount of light energy transmitted and received by a glossmeter and expresses the value as a percentage of the range at the particular angle of the measurement. The shinier a surface is, the closer the value will be to 100%.
While the Gloss Unit (GU) scale is linear, each angle of incidence has a different measurement range; 0 – 2000GU for the 20° angle, 0 – 1000GU for the 60° angle and 0 – 160GU for the 85° angle. %Reflectance displays the measurement value as a percentage relative to the selected angle of incidence. For example, a value of 1000GU at 20° would be expressed as 50% 20 and 500GU would be expressed as 25% 20. However at 60° this value would be expressed as 50% 60.
Haze (HU) on a coated surface causes a drop in reflected contrast and causes ‘halos’ to appear around the reflected light sources, dramatically reducing the visual quality. In accordance with ASTM D4039 haze is defined as the numeric difference between the specular reflectance at 60° and 20°. This is expressed in Haze Units (HU).
Readings & user selectable statistics
The glossmeter’s statistics display allows the user to select up to 8 different statistics, including number of readings, mean, standard deviation, hi & lo readings, providing a better understanding of the sample under test.
Readings & differential with pass/fail
The pre-defined geometry angles of gloss can be displayed along with the difference from the nominal or target value in Readings and Differential mode. If a limit standard is applied, the out of limit values are displayed in red, providing quick pass/ fail analysis.
Run chart or analogue scan bar
Graphical displays of the gloss meter can help to identify trends in data. The Elcometer 480 glossmeter has two different options available. The first is a bar graph that fills and empties as the reading increases and decreases respectively, helping the user to identify sudden momentary changes in gloss value as the unit is slid over a surface. The second - run chart or line graph, plots every gloss reading, ideal for identifying trends in data. When used in conjunction with scan mode the run chart will show the average, minimum and maximum at every point, providing highly detailed gloss information.