腾达试验仪器厂;

　　一、产品简介：

　　C84-III反射率测定仪是**涂层检测仪器，可用于漆膜遮盖力的测定。

　　全符合国际标准ISO3906-1980(E)、**标准GB/T13452.3-92、GB9270-88、GB5211.17-88对该仪器的规定要求。

　　Product introduction:

　　The C84-III reflectance tester is a coating testing instrument that can be used to determine the hiding power of paint films.

　　In full compliance with the international standards ISO3906-1980(E),**standards GB/T13452.3-92,GB9270-88,GB5211.17-88 requirements for this instrument.

　　二、技术参数：

　　1、测量范围0~100

　　2、重复精度0.3%

　　3、显示数据与反射光强度成正比

　　4、仪器的光普灵敏度近似等于Sc与Y的乘积

　　5、环境温度20°±5°相对湿度<85%

　　6、输入电源220V±10%50Hz

　　7，外形尺寸：180X210X470mm

　　8,重量：7kg

　　Technical parameters:

　　1.Measuring range:0~100

　　2.Repeatability 0.3%

　　3.The display data is proportional to the reflected light intensity

　　4.The optical sensitivity of the instrument is approximately equal to the product of Sc and Y

　　5.Ambient temperature 20°±5°Relative humidity<85%

　　6.Input power 220V±10%50Hz

　　7.Dimensions:180X210X470mm

　　8,weight:7kg

　　三、工作原理：

　　本仪器由探头、主体、标准板（黑白各一块）、工作陶瓷板(黑白各两块)等组成。

　　Third,the working principle:

　　The instrument consists of a probe,a main body,a standard board(one black and white each),and a working ceramic board(two black and white each).

　　探头采用0°照射，漫反射接收的原理。当试样的反射光作用于硒光电池表面产生电讯号输入到直流放大器进行放大，并予以读数显示（详见光路原理图及仪器框图）。

　　The probe adopts the principle of 0°illumination and diffuse reflection reception.When the reflected light of the sample acts on the surface of the selenium photocell,the electrical signal is input to the DC amplifier for amplification and readout display(for details,see the schematic diagram of the optical circuit and the block diagram of the instrument).

　　四、使用方法：

　　1、把探头与电控箱连接，同时接上电源，开机预热10-15分钟。此时应把探头放在黑色标准板上为佳。

　　2、校零：把探头放在白色标准板上，调整主机上的校零旋钮，使主机数字显示为000.0，允许变动±0.1.

　　3、校正标准值：把探头放在白色标准板上，调整主机的校标旋钮，使主机显示的数值与白色标准板的标定一致。允许变动±0.1反复调整一次（校零、校标）。

　　4、测量RB值：把探头移至放有试样的黑色工作陶瓷板上，显示器所显示的数值即为RB值。

　　5、测量RW值：把探头移至放有试样的白色工作陶瓷板上，显示器所显示的数值即为RW值。

　　6、计算求得对比率对比率（遮盖率）=RB/RW×a

　　Fourth,use method:

　　1.Connect the probe to the electric control box,connect the power supply at the same time,and warm up for 10-15 minutes after starting.It is better to place the probe on the black standard board.

　　2.Zero calibration:Put the probe on the white standard board,and adjust the zero calibration knob on the host to make the host's digital display as 000.0,allowing the variation±0.1.

　　3.Calibration standard value:Put the probe on the white standard board and adjust the calibration knob of the host to make the value displayed by the host consistent with the calibration of the white standard board.Allowed to adjust±0.1 repeatedly(zero calibration,calibration).

　　4.Measure RB value:Move the probe to the black working ceramic plate on which the sample is placed,and the value displayed on the display is the RB value.

　　5.Measure RW value:Move the probe to the white working ceramic plate on which the sample is placed,and the value displayed on the display is the RW value.

　　6.Calculate the contrast ratio.Contrast ratio(coverage ratio)=RB/RW×a

　　五、注意事项：

　　1、为保证测量精度，测量环境温度应接近25°C。仪器应经常校准，允许偏差为±0.3，若大于0.3需要新校准。

　　2、为克服硅光电池的光照疲劳现象，在测试的间隙时间内应将探头放在黑色标准板上面。减少插头的拔插次数，以免损坏插头，造成接触不良。

　　3、白色标准版应远离污染，否则会影响测量精度。如有污渍可用**绘图橡皮除净。

　　4、试样的制备应严格依照相关的**标准GB9271-88的规定进行。

　　Five,matters needing attention:

　　1.In order to ensure the measurement accuracy,the measurement ambient temperature should be close to 25°C.The instrument should be calibrated frequently with a tolerance of±0.3.If it is greater than 0.3,a new calibration is required.

　　2.In order to overcome the light fatigue phenomenon of the silicon photocell,the probe should be placed on the black standard board during the interval of the test.Reduce the number of plugs to remove,so as not to damage the plug and cause poor contact.

　　3.The white standard version should be kept away from pollution,otherwise it will affect the measurement accuracy.If there are stains,you can use the advanced drawing eraser to clean it.

　　4.The preparation of samples should be strictly in accordance with the relevant**standard GB9271-88.