Abstract

The instrument consists of a vacuum photoelectric cell feeding into a vacuum tube voltmeter with logarithmic input characteristic. The voltmeter employs a type 6D6 tube which is provided with a properly chosen biasing resistor in the cathode lead. This gives a plate current proportional to the logarithm of the input voltage. Since this relationship never extends to zero plate current, a portion of the plate current is balanced out, giving in effect, a suppressed zero instrument. Suitable shunts and a choice of input resistors afford several ranges of sensitivity. The output meter can be calibrated directly in concentration units. Other methods of achieving the same result are discussed.

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References

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  1. R. H. Müller, Mikrochemie 11, 353 (1932); Ind. Eng. Chem. Anal. Ed. 7, 223 (1935).
  2. S. Ballentine, Electronics 2, 472 (1931); J. Acous. Soc. Am. 5, 10 (1933); F. V. Hunt, R. S. I. 4, 672 (1934).

Ballentine, S.

S. Ballentine, Electronics 2, 472 (1931); J. Acous. Soc. Am. 5, 10 (1933); F. V. Hunt, R. S. I. 4, 672 (1934).

Müller, R. H.

R. H. Müller, Mikrochemie 11, 353 (1932); Ind. Eng. Chem. Anal. Ed. 7, 223 (1935).

Other (2)

R. H. Müller, Mikrochemie 11, 353 (1932); Ind. Eng. Chem. Anal. Ed. 7, 223 (1935).

S. Ballentine, Electronics 2, 472 (1931); J. Acous. Soc. Am. 5, 10 (1933); F. V. Hunt, R. S. I. 4, 672 (1934).

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