Download e-book for kindle: Error Analysis of a Temperature Measurement System by Scheller G.

By Scheller G.

To make measurements related, the standard needs to be said by way of specifying the dimension uncertainty. The ISO/BIPM "Guide to the Expression of Uncertainty in dimension" released in 1993, commonly abbreviated to GUM, brought a unified approach to settling on and specifying the dimension uncertainty. this technique was once followed by way of the calibration laboratories all over the world. Its program, even though, calls for a few mathematical wisdom. The simplified procedure utilized in the next chapters makes the dimension uncertainty essentially comprehensible for everybody who makes use of temperature size systems.Mistakes made whilst fitting temperature sensors and connecting the assessment electronics result in elevated size error.In addition, there are the dimension uncertainty parts of the sensor and overview electronics themselves. After a proof of the size uncertainty parts, a few labored examples are set out.A wisdom of the dimension uncertainty elements and their order of importance allows the consumer to lessen person elements by way of altering the set up stipulations or determining a distinct tool. The an important issue is usually the dimension uncertainty required for a dimension job. the place, for instance, a regular specifies limits for the deviation of the temperature from the nominal price, the size uncertainty of the size technique used are not exceed third of the restrict.

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Extra resources for Error Analysis of a Temperature Measurement System

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In addition, customers are increasingly demanding high quality standards for the products they purchase. If an organization is certified to ISO 9001, all test equipment used in the production process must have proven traceability back to the nationally recognized standards for the respective measured quantity. A high demand for calibrated instruments has developed. It is neither worthwhile (costs) nor possible on grounds of capacity, to cover all calibration requirements by a direct link to the national standards of the PTB.

For this reason, JUMO has developed resistance thermometers which feature high precision and good long-term stability, yet have a reasonable price. The precision resistance thermometers are available in various versions with calibration certificates for the desired temperature range. Of course, there is always a close relationship between costs and the required measurement uncertainty. The complete calibrated measurement system (see above for description and calculation of measurement uncertainty) is thus a viable alternative, as no additional instrument is needed to measure thermoelectric emf or resistance.

It is neither worthwhile (costs) nor possible on grounds of capacity, to cover all calibration requirements by a direct link to the national standards of the PTB. Because of this, the PTB, on request, appoints and monitors calibration laboratories in industry. These laboratories are affiliated with the German Calibration Service (DKD). The regular checks of the DKD calibration laboratories are undertaken by the DKD office and the PTB specialist laboratories. For example, as well as the annual audits, national and international circular comparisons are also carried out.

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Error Analysis of a Temperature Measurement System by Scheller G.

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