File:Clamp Type Milliammeter.jpg
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Captions
Captions
Clamp Type Milliammeter
Summary
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| Description |
English: Inventors: Stansbury, Caroll; Montgomery, G. Franklin.
This instrument permits a measurement of alternating current to be made without interrupting or breaking the conductor carrying the current to be measured. The heart of the instrument is a small current transformer with a split core that can be clamped around the current-carrying conductor. A transistor amplifier increases the output current of the transformer to an amplitude sufficient to actuate an indicating meter. On its most sensitive range, the instrument sensitivity is 200 microamperes full scale with an accuracy of plus or minus 5 percent over the frequency range of 50 cycles per second to 100 kilocycles per second. Since its development at the National Bureau of Standards, now the National Institute of Standards and Technology, this instrument, or modifications of its basic transducer, have been copied and manufactured by commercial instrument companies in the United States. (1956) |
| Date | |
| Source | National Institute of Standards and Technology Digital Collections, Gaithersburg, MD 20899 |
| Author | National Institute of Standards and Technology |
Licensing
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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:17, 13 July 2020 | | 2,166 × 2,734 (358 KB) | Ltncanada (talk | contribs) | Uploaded a work by National Institute of Standards and Technology from National Institute of Standards and Technology Digital Collections, Gaithersburg, MD 20899 with UploadWizard |
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