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Electrical Resistance Measurements and Calibrations |
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| Ultraprecise
electrical measurements require extremely stable temperature, humidity,
and vibration control. In this photo, physicist Rand Elmquist fills
a cryogenic chamber with liquid helium in preparation for measuring
the international standard for electrical resistance--the quantum
Hall effect. U.S. laboratories and manufacturers use NIST electrical
standards and calibrations for all kinds of measurements from home
electricity usage to electrocardiograms to gene-mapping. |
Copyright is owned by the photographer. This photo is available without charge for use in materials that describe NIST programs directly. All other uses require permission from the photographer. For further information or to receive a high resolution version of this image contact: Gail Porter, (301) 975-3392. |
Quantum Electrical Metrology Division Electronics and Electrical Engineering Laboratory Date created:6/25/04 |
