本文提出了一小部分的结果，从一个活跃的水研究基金会（原AWWA研究基金会） 对商用5/8 x 3/4英寸水表的精度进行了研究 在比现行标准规定的更大的流速范围内测定。目前，情况是积极的 位移（章动盘和摆动活塞）、多喷嘴、单喷嘴和射流振荡器 在美国可以使用电表。而一些制造商有多个流量计 其他产品则侧重于特定的计量室设计。研究部分 本文总结了150个新的仪表。虽然规模更大 每个制造商的产品样本都是可取的，使用六个相同的仪表作为基准 任何给定仪表的样本量导致25种不同的仪表设计被测试。 结果表明，大多数流量计在高达30%的流量下运行良好 大于公布的最大AWWA标准流量。另一方面，结果 当流量计在远低于标准的流速下进行精度测试时，测量结果会发生变化 最小AWWA标准流量。事件发生后，一个重大的担忧显露出来 确定相当多的新仪表不符合 最小、中间和最大AWWA标准精度测试流量下的精度。 本文总结了已完成的测试，并给出了新5/8 x的精度结果 3/4英寸米作为活跃的水研究基金会的一部分进行测试。包括12个参考文献、表格和图表。

This paper presents a small portion of the results from an active Water Research Foundation (formerly AWWA Research Foundation) study in which the accuracy of commercially available 5/8 x 3/4-inch water meters was determined over a wider range of flow rates than current standards specify. At present, positive displacement (nutating disc and oscillating piston), multi-jet, single-jet, and fluidic oscillator meters are available for use in the United States. While some manufacturers have multiple meter design offerings, others focus on a specific metering chamber design. The research component summarized in this paper investigated one hundred and fifty new meters. Although a larger sample of each manufacturer's offering would be desirable, six identical meters were used as the sample size for any given meter resulting in 25 different meter designs being tested. The results indicated that most meters perform acceptably at flow rates up to thirty percent greater than the published maximum AWWA standard flow rate. On the other hand, the results were varied when the meters were accuracy-tested at flow rates that were well below the minimum AWWA standard flow. A significant concern was made manifest after it was determined that a considerable number of new meters did not meet the minimum standard for accuracy at the minimum, intermediate and maximum AWWA standard accuracy test flow rates. This paper summarizes the testing completed and presents the accuracy results of the new 5/8 x 3/4-inch meters tested as part of an active Water Research Foundation study. Includes 12 references, tables, figures.