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 Brief Introduction To Standard Neutral Density Filter

   FNDF-100 standard Neutral Density Filter (Simply called FNDF-100 Filter) is jointly designed and developed by the Optical Department Of China Metrological Scientific Research Institute and Foshan Analytical Instrument Co., Ltd. It is used for the calibrating and testing of accuracy of extinction rate N of opacimeter, the Model FTY-100 Opacimeter, with single channel or similar structure. One set of FNDF-100 Filter is 5 pieces and its visible light transmission rate respectively is :20%,27%,34%,50%,and 71%. That is ,the extinction rate is :80%,73%,66%,50%and 29%, which meet the requirements of our National Metrical Testing Specifications for ¡°Opacimeter JJG976-2002¡±.The value-determining method adopts the integral result under the condition of standard human eye visual function V(¦Ë). It conforms to the international calibrating method, and it is more reasonable and scientific than that just determine the value at 555nm.Every set of FNDF-100 Filter has the calibration certificate from the China Metrological Scientific Research Institute.
   Features:
   * Accurate and reasonable value-delimitation
   * High stability for long operation
   * It could be wiped up and cleaned
   The basic material for the FNDF-100 Filter is made of neutral glass. As compare with the neutral density filter with coated film on its surface, the marresistance and thermost ability of this filter is higher. Therefore, it has a very good and long stability. If it is contaminated occasionally, its accurate value can be restored by cleaning it with alcohol or optical lens detergent.

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HONG KONG FEN XI YI GROUP LIMITED

Tel£º852-27227118

Fax£º852-27227180

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Foshan Analytical Instrument Co., Ltd.

Add£º No.16, Gangkou Road, Chancheng District, Foshan, Guangdong, P.R. China

Zip code£º 528041

Tel£º86-757-83826800 83832918 83829800 83823028

Service:86-757-83834097(3 lines) 13827735888

Fax£º86-757-83829033

E-mail£º sales@fofen.com  fofen@fofen.com