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Bank of France than the freezing point temperature of


, The thermometer into the cast metal in the depth of immersion is also different. Table 1 shows the specific circumstances of Table 1 point to participate in pits than on the summary of the main characters in the N samples from the country I IM Pi - A poison sac g lead - 4 to send samples to the body】 imMB cabinet f 『Bauer Guo of China Semiconductor J \the work of the base container. China's silver on the container than the national benchmark container MIN-Ag-4, the container with the German Technical Physics Institute (PTB) compared with before, is the silver freezing point of the container base. container exports and a connected to a vacuum argon system. containers so that the first vacuum pressure is less than a, then with high purity argon (purity 99.9999) washed several times, and finally the pressure inside the container control in the range of 101.3 soil 0.5kPa in three, compared to the electrical measuring equipment and method of temperature measurement device is a key part of accuracy as compared to the use of electrical measuring equipment for the Canadian Union 9975 High Bridge, the standard resistor matching the biggest change in recent years to ask 9X10 only one,[link widoczny dla zalogowanych], the resistance temperature coefficient a = 0. standard resistance temperature stability of special incubators 0.02C. set of electronic measuring devices measure the sensitivity of better than 0.1 (equivalent to 0.ImK), measure the resistance ratio uncertainty is less than 2 × lO ~. Alignment M an Ag-4 furnace using high temperature heat pipe, while the INM-Ag sealed containers with Chinese Silver Point Silver Point the rejection of the furnace. Bi on the sharing of the nine Chinese-made high-temperature platinum resistance thermometer. Bi on, the first sealed container placed in the French Silver Point furnace, warming to the Bank of temperature and freezing point plateau 其 as follows: Silver Point completely melted metal furnace heating Zhichun,[link widoczny dla zalogowanych], will be temperature stable than the high freezing point of about 2 ℃, settling time less than 30 minutes, and then make. loessial temperature to 1.5 ℃ / mln slow rate of cooling when inserted in the furnace of silver point temperature of the container in the thermometer stopped declining and recovered, remove the temperature thermometer, inserted into a cold quartz tube, which lasted about a minute out, and then to determine the temperature measurement technology until 1998. № 2 meters into the container, and then began to reach thermal equilibrium measurements. at the same time than the freezing point temperature control about the low 1.5 ℃, a silver point of solidification temperature plateau with two thermometer, a thermometer in the determination of silver points immediately after the annealing furnace into the rose 700C annealing for two hours, and then with the furnace cooling to below 420 ℃ removed. and then measuring the triple point of water. In measurement,[link widoczny dla zalogowanych], the first measurement of resistance by 10mA current,[link widoczny dla zalogowanych], and then measured by 10X ~ / 2mA current resistance value, a total of five measurement data. and measurement results are extrapolated to zero power consumption corresponds to The resistance value, in order to eliminate current measurement errors caused by self-heating effects. and silver containers of liquid static pressure points caused by the thermometer into the temperature change is to amend the depth of immersion. than the Communists used the nine high-temperature platinum resistance thermometer, In France the silver freezing point temperature before each measurement over the aerodromes,[link widoczny dla zalogowanych], and seek the support of the resistance thermometer in silver point than WAg: R / n. and then the freezing point of silver in China, Wen Pingshang nine high-temperature platinum resistance thermometer as the measurement twice also calculated the resistance ratio measurements France towel in Table 2. Wrap 2 silver freezing point measurements French IV measurement uncertainty in accordance with the International Bureau of the proposed method to estimate the point D than on the uncertainty. A Class uncertainty of the thermometer measured by the nine calculated as follows: a √: V ~ / En (n-1)] where a 9, V, for the residual value of each thermometer. B type uncertainty according to the probability of the letter equivalent to 1 count, estimates in Table 3. 3 silver freezing point decline compared with the uncertainty (1 (inK) lB class synthesis of several components of the fixed points of nonlinear I l electrical measuring static pressure correction No silver freezing point of mastery l o.32l0.12 {05l0.670.a five, compared to the conclusions in December 1987 to January 1988 and Germany (PTB) of the comparison, China's NIM-Ag-4 Germany's PTB-Ag than a 2 Low 0.42mK, two silver containers to achieve the freezing point temperature lmK consistent. The comparison with France, China NIM-Ag-4 than the work of the French benchmark INM - Ag High 8.28mK, and the comparison of the French vessel INM-Ag lower than the national benchmarks 8.2mK. In this way, China's benchmark silver freezing point of silver than the freezing point of reference in France with high 0.08mK, are consistent within lmK. The results demonstrate the freezing point of silver in China is a reliable and stable. References [1] Gmcomo, P. Metrologmt

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