Overview
SHIBO BD-457 digital whiteness meter is an instrument for direct measurement of the whiteness of flat surfaces or powders, especially for accurate measurement of paper Opacity. It conforms to relevant national professional standards and Measurement verification regulations.
Features
1. Meet the national whiteness meter JB/T9327-1999 professional standards and JJG512-2002 national Measurement verification regulations.
2. Using the principle of photoelectric effect, the measurement is accurate.
3. Opacity and whiteness measurement.
4. The instrument consists of a host, a probe, a standard whiteboard, a standard blackboard, etc., and is fully equipped.
Principle
The instrument uses the principle of photoelectric effect to measure the "whiteness" and "Opacity" of the object by measuring the radiance luminance of the diffuse reflection on the surface of the sample and the radiance luminance of the complete diffuse reflection under the same irradiation conditions.
Applications
Spinning & weaving, printing and dyeing, construction, minerals, paper, paints, coatings, Pottery and porcelain, clay, talc, plastic items, detergents, Household chemicals, flour, salt, white cement and other objects Determination of whiteness
Standards
JB/T9327-1999、JJG512-2002、ISO2471-77
Steps
1. Turn on the power supply, place the probe on the standard blackboard, and turn it on to warm up for 15 minutes.
2. Zero and calibrate: put the probe on the standard blackboard to adjust the zero hand button to zero; then put the probe on the standard whiteboard to adjust the calibrate hand button to make the data match the calibration value of the whiteboard.
3. measurement:
A. whiteness measurement: After the instrument is zero-calibrated, the sample is tested and the displayed value is the whiteness value.
B. Opacity measurement:
(1) The sample is placed on the instrument to test five layers, and the reflection factor R ∞ of each layer is recorded.
(2) The five-layer samples were tested on a blackboard as a substrate, and the reflection factor R0 of each layer was recorded.
(3) Repeability step (1) (2), the measurement of the sample reverse R ∞ and R0 values.
(4) Calculate the average of the front and back sides R ∞ and R0.
(5) Calculate the Opacity value according to the formula T = 100 * (R0/R ∞), and report the results as required.
Notice
• In order to obtain accurate data, during testing, it should be calibrated with zero adjustment.
• In order to eliminate the fatigue of the receiver, the probe should be placed on the blackboard without measurement.
• During measurement, when placing the probe on the test object, pay attention to the same position each time.
