Encyclopedia of Calibration

That of the calibrating device displayed or generated value of a measuring size. Mostly he differs partly by the measuring deviation from the Kalibrierwert which is shown by Normally or a normal measuring device or is measured.

see adjustment..

Change certain parametre of a measuring instrument, around the observance given. To reach properties (also adjusting). The need and order of magnitude of an adjustment can be determined by the calibration.

Measuring instruments or other devices which are seated in a production process to the backup of the product quality.

Check and evaluation of the usefulness of an agent by regular potash Brie posts in comparison to the user's specifications and the documentation of the besides ascertained measured data.

For certain measuring instruments (e.g., scales in the sales range, current counter, petrol pumps and for all devices the retail price proportionally to measured data investigate) the state check is prescribed for the protection of the consumer in the German standard law. The physical-technical collar institution monitors the standard being in Germany. Standard-capable devices must be typgeprüft and are calibrated in solid distances once more. The standard badge marks the duration of the validity of a calibration. Besides, the activity of calibration does not differ, is carried rather by the terminology for the difference between industrial and legal measuring being calculation. However, standard notes are recognised in contrast to ISO to 17025 correspondent potash Brie posts within the industrial measuring being not as a return proof.

Process of the calibration.

To reach permanently right measurements the used agents must be calibrated at regular intervals e. One calls these distances Calibrating interval. The length of this interval is depending on the statements of the device manufacturer, the demanded measuring uncertainties as well as separate definitions in the quality assurance system of an enterprise..

Measuring space to the calibration. As a rule laboratory spaces should be tempered with steady(constant) conditions like 23°C or 20°C to exclude influence from temperature variations on measurement results. Actual temperatures must be considered while calibrating and come into the measuring insecurity.

In the calibratingnotes the occurred calibration of an agent is documented. In addition the device data as well as the values measured during the calibration are recorded. Besides, the minimum requirements regulate German Institute for Standardization EN ISO 17025, paragraph 5.10.2 and 5.10.4 to the contents of calibrating to notes: It has to do, for example, recognizably its which laboratory the measurements has carried out where and under which conditions the calibration was carried out which agents were used to which was seated process which deviations and measuring uncertainties were achieved and which parts of which measuring-technical specification are fulfilled. Calibratenotes without these statements are worthless for the quality assurance, because the deviations of the agent of the used normal are not recognizable and thus the sense of a calibration is questioned.

The calibratingseal marks a device as calibrated. It should carry an unequivocal number, so that the allocation is possible to the accompanying calibratingnote with the ascertained measured measurement values. Besides, it should contain the datum of the calibration or the time of the next calibration..

Comparison of measurements of an agent with the values more precise normal after a documented process with the destination to recognise(see) deviations and to record. The dictionary of the metrologie (VIM) defines: „If The activities calibrate enclosed to the determination of the connection between the displayed values of a Messmittels [...] and the known values of the measuring size under known conditions.“ Besides, the observance of given tolerance can be checked, in addition and if necessary an adjustment be carried out. The concept(idea) Calibration do not contain this adjustment, nevertheless, necessarily. Their function and accuracy is checked by the calibration of agents and is documented in the calibratingnote. After repair and maintenance works a calibration must always take place. The used normal must be traceable back on national normal.

Entry of the difference of a measurement value of the Kalibrierwert of the measuring size.

This international standard fixes(determines) quality standards for Test and Kalibrierlaboratorien. A quality assurance system is demanded in the essentials like of the standard family ISO in 9000, skilled staff, high competence, as well as the traceability of the used measuring means. The labs accredited in the German Kalibrierdienst must fulfil among other things(and others) the demands(standards) of this standard and are monitored(audited) regularly.

The most important European standard row for the quality assurance (also as EN 29000). She demands a documentation of all executions(sequences) in a company, traceable back potash Brie posts as well as an agent supervision. However, about the actual quality of the generated(produced) products no statement(predicate) is met.

This value is generated either by Normal e.g., Calibrator or an agreed process and then is measured with the specimen. With calibrating to the objects which itself will deliver sizes the calibrating value in the specimen opposed and the measurement value with a normal measuring device (e.g., voltmeter) measured. Also the measuring sizes generated by normal are defeated by a measuring insecurity.

An estimated value for the range in which the calibrating value of a measured size lies. It is often computed by statistical considerations and stands in connection with the variance of the measured values of a series of measurement. Depending on the demanded trust level the measuring insecurity arises(surrenders) as a rule as a multiple of the standard deviation.

The science of the measurement.

see deviation.

A process or device by which a certain size is embodied. A voltage source can explain also Normally, like a measuring instrument which measures an otherwise generated size. Some measuring sizes are also shown with physical constants or certain physical experiments as Normal. By Normally generated sizes are always afflicted with a measuring insecurity which is caused, e.g., by noise, thermal variations or ageing. To receive expressive values for the evaluation of a measuring-technical specification the measuring uncertainties of specimen and Normally a ratio of at least 4:1 should show.

Calibration of the agents immediately at the insertion place with the customer. The transport of the agents is cancelled thereby in the Kalibrierlabor and the down-times online with it. However, with high-precision measuring instruments it is not often possible which normal with their full accuracy need on site to make available, so that in these cases is to be advised against an on site-calibration.

Values of the measuring protocol, which outside that of the manufacturer, which from the customer whom lie by the laboratory or the accompanying standards or directives to given tolerance.

A sequence of the measurements and tests which allow a checking of the proper function of a device. Mostly such a test is given by the device manufacturer. By the checking of all relevant device parametres this test is often suitable as a basis for the measuring protocol of a calibratenote.

The uppermost German authority in the measuring being. The PTB has the legal(lawful) order(coat) to maintain national normal for all SI units and to transmit to the economy and science. By the supply the primary-normal in the FRG and international comparative measurements she(it) makes sure that '1 volt is also a 1 volt', i.e. that a calibration also remains in the international comparison valid. In addition the accreditation place into German Calibrating service monitors(audits) united calibrating labs and makes sure that their(her) normal on her(their) national normal and with it(thus) are also traceable back internationally.

Parts per million, statement for very small deviations. ppm corresponds to a deviation from 10^-6, this corresponds to 0.0001%.

All planned and systematic activities which are executed to fulfil a quality requirement.

Everybody for the realisation of a quality requirement to necessary organisational structures, processes and means.

ISO 17025 correspondent nevertheless not accredited calibrations. As with the DKD calibration are so selected the measured data to be calibrated in arrangement with the quality assurance of the customer or by the expertise of the laboratory that all ranges relevant for the respective purpose are measured. The analysis of the measurement results takes place normally with the help of the specification borders, unless from the customer is wished, in addition, an evaluation including measuring insecurity. The ascertained values are documented in measuring protocol of the calibratingnote. Every device receives a calibrating seal from which the number of the calibratingnote and the month of the next calibration arise.

International system of physical units. The realisation of the single units is determined internationally and is seized by the national authorities responsible for it (in Germany the physical-technical collar institution). The agreement of the units is checked by international comparative measurements regularly.

Default about the properties of a device by its manufacturers. In the metrology above all the statement of the measuring conditions and the besides accessible accuracy is interesting.

To reach the property of a measuring instrument, a constant indicator about a certain time range. By ageing of components the properties of a measuring instrument change in the course of the time. By potash Brie posts in agreed time intervals can be made sure by a renewed adjustment that the device fulfils, nevertheless, its specifications.

see Normal

It is reached only if everybody has an unequivocal relation to national normal with the calibration of an agent to used normal. In addition must be calibrated the used normal either immediately with the national normal or with normal traceable back for their part and these potash Brie posts be documented. Thus a traceable "family tree" originates from every agent to the accompanying national Normally. If national normal are not available, international normal, physical physical constants or given procedures can be used instead of this also to the embodiment of a size. Only by the traceability unequivocal measurements which remain reproduceable also internationally are possible.

Actual value of a measured size. The values shown in the measuring protocol are only one estimate of this true value which is afflicted with a certain measuring insecurity.

In case of the statistical consideration of the measuring uncertainties a range in which the true value of the measuring size lies surrenders. Besides, they of esz given measuring uncertainties refer to a trust level of 95%, i.e. the true value lies with a probability of 95% in the range of the given measuring insecurity. This statement originates from the acceptance of a normal distribution of the measurement values how this is also used by the physical-technical collar institution and many other European metro-logical state institutes.

This value is measured with the calibration before an adjustment. These data can be of interest to the judgement of the values earlier measured in a production process or the stability of a measuring instrument for the quality assurance.

Devices with mains connection are tested after VDE 0701/0702, if no valid VDE badge is right or the device was opened. Thus the electric safety is guaranteed for the user. The electric safety check corresponds to the demands of the BGV A3 and is documented including measurement result separately.