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Title: Application Of Statistical Sampling To Meter Testing
Author: Ralph C. Stanford
Source: 1972 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1972
Abstract: Sampling is the means of determining the nature or makeup of something by looking at a few things of many or a portion of the whole. In order to properly consider sampling and all of its modern ramifications, the word statistical must be added. This word is derived from statistics which has two quite different meanings. As a plural noun it refers to any facts stated in terms of numbers. In the other sense it is used as a singular noun and refers to a body of methods by which useful conclusions can be drawn from numerical data. One may say, Statistics is based in large part on the law of large numbers and the mathematical theory of probater repair procedures, we should have the meter brought to the shop as near as possible in the same condition as it was when removed from service. Transportation and the manner the meter is handled can be a factor on any of these tests. 9. AUTOMATIC EQUIPMENT This type of equipment can be utilized in all shops regardless of size. Such tools are not expensive and will materially reduce the cost as well as the effort required for repair work. Air tools are generally preferred to electric power tools for the reason they are more flexible in their operating characteristics. In choosing a tool, such as a pneumatic screwdriver, flexible operating characteristics such as starting, stopping, reversing, variable speeds, interchangeability, variable torque and sizes of driver bits it will take, as well as sockets, should be considered. Also, it should have a counter balance that will pull the tool out of the way whenever the operator releases it, yet it is at hand when he requires it for use again. This is far better than the practice of laying it down on the workbench. For long life, a high pressure oil lubricator should be placed in the line ahead of the tool in order to carry proper lubrication to the working parts. This type of tool should be operated at the pressure recommended by the manufacturer. If your air pressure is too high, a suitable regulator should be provided to deliver the desired pressure to the tool. SUMMARY Remember, a meter must be accurate when tested and remain accurate while in service if it is to accomplish its purpose, to assure your company of its full income and guarantee the customer full value for his money. SAMPLING TO METER TESTING bility. The latter usage is accurate in the term statistical sampling.

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