Vacuum Tube Circuit to Measure the Logarithm of a Direct Current
A circuit, using a single tube, and having an output voltage which is proportional to the logarithm of a direct current input, is described. The input current range extends from less than 10−7 ampere to 10−5 ampere if a closely linear logarithmic relationship is desired; and from 10−8 to 10−3 ampere...
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| Veröffentlicht in: | Review of scientific instruments 1939-11, Vol.10 (11), p.336-339 |
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| Format: | Artikel |
| Sprache: | eng |
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| container_end_page | 339 |
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| container_issue | 11 |
| container_start_page | 336 |
| container_title | Review of scientific instruments |
| container_volume | 10 |
| creator | Meagher, Ralph E. Bentley, Edward P. |
| description | A circuit, using a single tube, and having an output voltage which is proportional to the logarithm of a direct current input, is described. The input current range extends from less than 10−7 ampere to 10−5 ampere if a closely linear logarithmic relationship is desired; and from 10−8 to 10−3 ampere if only an approximately logarithmic characteristic is necessary. Because the circuit depends for its operation on a fundamental physical law (the Maxwellian distribution of velocities of the thermoelectrons emitted from a hot cathode), its characteristics are constant and predictable. |
| doi_str_mv | 10.1063/1.1751459 |
| format | Article |
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The input current range extends from less than 10−7 ampere to 10−5 ampere if a closely linear logarithmic relationship is desired; and from 10−8 to 10−3 ampere if only an approximately logarithmic characteristic is necessary. 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The input current range extends from less than 10−7 ampere to 10−5 ampere if a closely linear logarithmic relationship is desired; and from 10−8 to 10−3 ampere if only an approximately logarithmic characteristic is necessary. Because the circuit depends for its operation on a fundamental physical law (the Maxwellian distribution of velocities of the thermoelectrons emitted from a hot cathode), its characteristics are constant and predictable.</abstract><doi>10.1063/1.1751459</doi><tpages>4</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0034-6748 |
| ispartof | Review of scientific instruments, 1939-11, Vol.10 (11), p.336-339 |
| issn | 0034-6748 1089-7623 |
| language | eng |
| recordid | cdi_scitation_primary_10_1063_1_1751459 |
| source | AIP Digital Archive |
| title | Vacuum Tube Circuit to Measure the Logarithm of a Direct Current |
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