国产精品99久久久久久www_乱小说录目伦合集最新章节_国产区小视频_一级毛片aa免费观看

【Scope of application】

The retroreflective sign measuring instrument is also called the retroreflective coefficient measuring (determining) instrument for reflective school uniforms in primary and secondary schools. It is a special instrument used to measure the retroreflective coefficient (R’) of traffic on reflective school uniforms.

【Related standards】

GB/T 28468-2012 traffic safety reflective school uniforms for primary and secondary school students

【technical parameter】

1. Observation angle (α): continuously adjustable within the range of 0°～2.0°, and the reading accuracy is 0.002°;

2. Incident angle (β): continuously adjustable within the range of 0～±40°, and the reading division is 1;

3. The color temperature of the light source: 2856K (ie CIEA light source);

4. Detector: silicon diode, after being corrected by the filter, it meets the requirements of CIE standard photometric observer's spectral luminous efficiency V (λ);

5. The opening angle of the detector aperture to the sample: 12';

6. Measuring range: 0～1999 cd·lx-1·m-2 (three levels: ×1, ×10, ×100)

7. Instrument display: three and a half digital display meter.

8. Power supply: the input AC voltage is 220V, 50Hz; the output DC voltage is continuously adjustable within the range of about 1～6V, and the accuracy is ±0.02V.