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Consumer Electronics by S. P. Bali

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CAMERA TUBE CHARACTERISTICS

One important characteristic of all camera tubes is their light transfer characteristic. This is the ratio of the face plate illumination in foot candles to the output signal current in nanoamperes (nA). This characteristic may be considered as a measure of the efficiency of a camera tube. Typical values of output current range from 200 nA to 400 nA.

The term gamma, in a television system, is applied to camera tubes and to picture tubes. Gamma is a number which expresses the compression or expansion of original light values. Such variations, if present, are inherent in the operation of the camera tube or picture tube.

With camera tubes the gamma value is generally 1. This value represents a linear characteristic that ...

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