Why is calibration important

What does calibration mean?

In the age of digitization, measurements are carried out to test DSL connections to ensure that the connections comply with the specified standard values ​​and are therefore within their tolerance range. In order to be able to measure these values ​​precisely, a calibrated measurement technology is required.
But what does calibrated measurement technology mean? Why are measuring devices subject to tolerances? When should tolerances be adjusted?

What tolerances do measuring devices have?

When choosing the measuring equipment, a look at the technical documentation is an important aspect. The upcoming measurement should be carried out in the best possible way and lie within the system limits of a measuring device. The range of measurement uncertainties or measurement tolerances is often the first indicator of the quality of a measuring device.

Why do measuring devices have measurement inaccuracies?

All measuring devices have tolerances or are subject to these due to their design. As a rule, this cannot be avoided. The tolerances lead accordingly to deviating measurement results. How big the tolerances may deviate in each measuring range is indicated by each manufacturer in their technical descriptions of the measuring devices. Most of the time this is done by giving an approximate percentage.

As with the tolerances, measurement inaccuracies on measuring devices depend on the design and use of the components. Measurement inaccuracies are errors or deviations that often cannot be adjusted and can only be reduced by taking multiple measurements. Large measurement inaccuracies can also arise from external interference or defects.

What is meant by an adjustment?

Adjustment is the process in which a measuring device is set or balanced in such a way that the measurement deviations from the target value are kept as low as possible and are within the device specifications. The measuring device is permanently changed.

Adjustment is often very closely related to calibration. The aim of both processes is to identify and document deviations. If the display of a measuring device or the output variable of a control unit is outside the permissible tolerances during calibration, the device must be adjusted until the measured values ​​are within the permissible tolerances.

What does traceability mean?

Traceability is a fundamental concept in calibration. If a calibration carried out by a manufacturer of a measuring instrument were not traceable, then it would be unclear whether a calibration carried out is correct at all. Traceability is the property of a result and not of a device and describes the calibration chain of the devices used for calibration. Should a chain link break within this chain, all of the rows below can no longer be traced back. The traceability is justified on the basis of SI units (International System of Units).

Why does a measuring device need to be calibrated?

The need to calibrate a measuring device and thus also the frequency of recalibration at certain time intervals results from the importance of having to limit measurement errors or measurement inaccuracies. Calibration gives you the assurance that the measuring device is working properly and safely.

What is a calibration?

Calibration is a measuring process to determine whether a measuring device deviates from another measuring device or a measuring standard. Any deviations are then documented. Clear tolerance ranges are specified in the measurement results in advance and readjusted in the event of a deviation.

A calibration includes, for example, the following work steps:

First, the environmental conditions are determined in a measuring process. A model for evaluating the calibration and the uncertainties is then created. The calibration is then carried out. Last but not least, the measurement results are documented with existing deviations and measurement uncertainties. A calibration certificate is then created from this. This certificate and the calibration generally correspond to ISO9001.

A calibration is a determination and documentation of deviations of the display of a measuring device from the correct value of the measured variable. The calibration accordingly, under previously defined conditions, establishes a relationship between the reading of one measuring device and the standards originally determined and the tolerances displayed therefrom. The tolerances are clearly defined here.

In general, it should be noted that the calibration is a snapshot (actual state at the time of calibration). No metrological changes or readjustments are taken into account here. If adjustments are necessary, a new calibration must be carried out.

What is an Accredited Calibration?

The accredited calibration enables a measurement laboratory or an independent company to subsequently carry out a calibration according to the ISO standard within specified tolerances or adjustments. The accreditation of a measurement laboratory in Germany is carried out by the DAkkS (German accreditation body) and corresponds to ISO / IEC17025.
In the case of an accredited calibration, the calibration laboratories are monitored by the accreditation body. In contrast, with a "normal" ISO calibration, traceability is subject to the self-commitment of the calibration laboratory.

What is calibration?

A calibration is a test of measuring devices prescribed by the legislator, in which compliance with the underlying calibration regulations and provisions, in particular under the underlying calibration error limits, is stipulated in accordance with the calibration law. Calibration is a sovereign task that is carried out by calibration offices or recognized test centers. The supervision, as well as the instructions for this, is carried out in Germany by the Physikalische Technische Bundesanstalt.

Please insert a picture of a calibration from our technology

The use of a calibrated measuring device is advisable for the production or reproduction of usable measurement results. Regular adjustment and calibration ensure that the reading is matched to the measured value in the best possible way. With the calibration certificate, the reading can be correlated with the measurement uncertainty and thus the measurement result can be mapped. The latter can be traced back using SI units.