ISSN:
1573-8906
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
Notes:
Conclusions 1. The design formulas recommended in educational and technical literature for determining temperature deformations cannot be used for practical purposes. This is due mostly to the fact that it is virtually impossible to determine the temperature which affects deformations. It is not always clear which component or which dimension is subject to temperature deformation, not to mention the fact that the linear expansion coefficients are hardly ever known. In all the measurements temperature oscillations were observed within the range of a few degrees even in a single instrument. 2. In view of the impossibility of using computation formulas recommended in literature, temperature corrections cannot be applied in production measurements. In those cases when such corrections, nevertheless, have to be used, they should be determined experimentally for the various production conditions. Work should be directed in this field towards producing conditions for which no temperature correction are required. 3. It is necessary to provide the majority to hand-operated instruments with thermal-insulating spacers so as to reduce the effect of the operator's hands heating up the instrument and altering its dimensions. Instrument-making plants should check up all their instruments for the effect of temperature deformations. 4. In order to reduce the effect of the heat produced by the hands on the error of the instrument it is necessary to grip it and hold it in the operating position for 5 to 15 min before setting it to the required dimension.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00990868
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