SWITCHING CIRCUITRY
In order to switch a great number of thermocouples successively to a measuring instrument, so that this switching is performed with a speed of, e.g., thousands of commutations per second, an electronic switching device is provided with a beam-switching tube such as the Dekatron'' tube. In this tube an electric discharge arises between a common anode and one of a series of cathodes, each of which is connected via resistors to ground. This resistor forms a voltage divider with a collector connected via a diode with one of the terminals of the thermo-couple, the other terminal being connected, together with the corresponding terminals of the other thermo-couples, with an amplifier. If a given cathode conducts a current to the ground potential, a voltage drop arises so that the collector gets spotential sufficient to make the diode conducting. The voltage generated by the corresponding thermo-couple then controls the ampli fier, while the other thermo-couples do not influence the amplifier. The current beam is switched from cathode to cathode by applying a switching signal to two control electrodes of the tube. (NPO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-027395
- OSTI ID:
- 4805338
- Report Number(s):
- FR 1240365
- Country of Publication:
- France
- Language:
- English
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