Regional Maintenance of the Volt Using NBS Volt Transfer Techniques

In cooperation with five industrial standards laboratories, the National Bureau of Standards (NBS) studied the feasibility of establishing a regional volt maintenance and surveillance program in the greater Los Angeles, Calif., area. The objectives were to improve surveillance, to reduce dependence on NBS, and to have each laboratory maintain its unit of voltage to within 1 ppm of the U. S. legal volt. A two-phase program was established, the first to characterize the five laboratories and the second to carry out the surveillance. After 3 years all laboratories were found to be maintaining their unit to within better than 1 ppm of the U. S. legal volt.