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The Model 200 Pulse Counter
1.O. H. Schmitt, J. Sci. Inst. 15, 24 (1938).
1.Also see O. S. Puckle, Time Bases (Chapman and Hall, London, 1943), for a discussion of the basic Schmitt circuit.
2.This time constant is essentially one of the coupling elements of the preceding pulse amplifier.
3.W. B. Lewis, Electrical Counting (Cambridge University Press, Teddington, England, 1943).
4.Recently germanium crystal diodes have been found to work quite satisfactorily as coupling elements by the scale‐of‐two. Two Sylvania Type 1N34 diodes in series are used to replace each half of the 6H6.
5.The 6SN7 scaler built with the same components but not with plug‐in type construction will usually have a resolving time of about two microseconds.
6.For operation and theory of the Eccles‐Jordan trigger circuit, see H. J. Reich, Theory and Applications of Electron Tubes (McGraw‐Hill Book Company, New York, 1944), second edition, Chap. 10.
7.Subsequent to the development of the circuit shown here, it was pointed out to the authors that scales‐of‐two using metallic rectifiers is described by W. B. Lewis, Electrical Counting (Cambridge University Press, Teddington, England, 1943). The mechanism of operation, however, is somewhat different.
8.As many as twenty stages have been used in one continuous chain.
9.A diode switching arrangement has been used to convert a scale‐of‐16 into a decade (scale‐of‐ten) scaler which operates completely satisfactorily. The scale‐of‐ten circuit will be described at some later date.
10.For many purposes a panel‐mounting impulse register may be desired. The “Mercury” Model M115D, sold by the Production Instrument Company of Chicago has been used in this circuit. It will operate at about 20 counts per sec. and lists at $6.25. It may be necessary to increase the capacity of Fig. 6.
11.Ratio of fractional change in input voltage to fractional change in output voltage.
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