Measurement of Current during Short Exposures
| Autor: | M. M. Schwarzschild |
|---|---|
| Rok vydání: | 1930 |
| Předmět: | |
| Zdroj: | Radiology. 15:132-135 |
| ISSN: | 1527-1315 0033-8419 |
| DOI: | 10.1148/15.1.132 |
| Popis: | Recently there has appeared in Germany a ballistic milliamperemeter. The instrument is produced by Hartman and Braun and permits the measurement of current flowing for very short periods of time. Prior to the announcement of this new meter the author devised a circuit, herein described, which makes possible such measurements with apparatus readily available at a reasonable cost. Because of the simplicity of the arrangement it ought to be of interest to those who wish to control rapid exposures. The elements of the circuit are shown in Figure 1. C is a condenser of high capacity; in the author's model it consists of 25 paralleled condensers of 10 microfarads each, capable of withstanding 200 volts. R is a resistance, in the present model, 200,000 ohms. M is a milliamperemeter. In the present model the full scale deflection is 1 milliampere. S is a simple switch. The device is connected as indicated, in series with the tube, and must, of course, if there is no center tap on the transformer, be mounted on an... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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