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<br />A horizontal swivel arm was located above the catch bucket to <br />hold a 50-mL beaker. When needed, the 50-mL beaker was swung <br />into position below the IV feed to intercept the flow for control <br />measurement purposes. <br /> <br />IV. Procedures <br /> <br />Several test and system design variations were tried before <br />the system was considered acceptable. Shakedown of the system <br />was basically complete on 10 November 1982. Of the fifteen tests <br />conducted on or after 15 November, only those that provided <br />sufficiently stable flow rates and had no other operational or <br />procedural faults were used to assess resolution capabilities <br />(see Table 2). The daily routine of each test was varied <br />slightly, but always utilized the same general procedural and <br />measurement techniques as outli~ed below: <br /> <br />I <br />',-' <br /> <br />\. <br /> <br />To start each test, a chart was first mounted on a chart <br />drive cylinder, and fastened with tape to prevent the "bump" that <br />would have been caused by the metal chart clip which was not <br />used. The clock was manually wound before the cylinder was <br />positioned on the drive. The fluid feed was first allowed to <br />fall into a "waste beaker" while the desired flow rate was <br />established. When the drip rate appeared constant, the waste <br />beaker was removed and the feed was allowed to flow into a 50-mL <br />control beaker, usually for 30 minutes. This flow was referred <br />to as the "control flow." The pen trace on the chart was started <br />at the beginning of the control flow period. The contents of the <br />beaker were weighed to calculate the flow rate. Once the control <br />beaker was moved out of intercept position, the flow would fall <br />into the raingage beaker. This flow would be continued for a <br />period of generally 1 to 2 hours and called "test flow." Every <br />thirty minutes the drip rate was recorded. Room temperatures and <br />time were also recorded. <br /> <br />While the test flow continued into the raingage beaker, the <br />contents of the control beaker were weighed. After cleaning and <br />re-weighing the control beaker it was returned to the swivel <br />support for the next control check. After a second control <br />intercept was taken (usually for 30 minutes), a second control <br />flow rate was calculated. The test flow rate for the interval of <br />time that the feed entered the raingage beaker was calculated as <br />an average of the two control flows before and after the test <br />flow period, respectively. <br /> <br />Most tests were started before 09:00 MST and generally <br />continued for 5 to 8 hours. Once a test had ended, the beginning <br />and ending points of "test flow" and "control flow" periods were <br />marked on the chart, and the chart trace read. In all cases, <br />chart readings were carefully estimated to the nearest 0.005 <br />inch. Then the control flow rates were calculated and the <br />expected chart trace plotted with time. This was done to prevent <br /> <br />6 <br />