- What does calibration mean?
Calibration in the field of instrumentation means the detection of measurement deviations of an instrument. Calibration does not include technical interventions on the instrument such as correction of the zero point, span or linearity, etc. In indicating instruments, the deviation between indication and correct value is calculated.
- What does adjust mean?
Adjusting means configuring or synchronizing an instrument to reduce deviations as much as possible or keep all deviations within a given error limit. Therefore, the adjustment includes an intervention in order to modify the instrument in a constant manner, for example by moving the indicator needle.
- What is maximum allowable error?
It is the extreme value of the measurement error, with respect to a known reference magnitude value, permitted by the specifications or regulations for a particular matter.
- What is accuracy class?
Class of measuring instruments or systems that satisfy specific metrological requirements intended to maintain measurement errors or instrumental uncertainties within specified limits, under given operating conditions.
An accuracy class is usually indicated by a number (1% F.S.) or a symbol adopted by convention (Grade A), published in a standard or technical document.
- Why should instruments be calibrated?
To ensure the permanent quality of the products, the quality system according to DIN EN ISO 9000 regulations has been applied for years. This regulation requires the verification of all relevant quality characteristics and the application of calibration devices with traceability. Calibration ensures internationally comparable results and reduces product liability risks; It is an important condition for competitiveness in the markets of the future
- How is a calibration interval determined?
To ensure continued correct measurements, testing devices must be monitored and calibrated at regular intervals. The user of a calibration device assumes the responsibility of determining the calibration interval. There are numerous factors that must be considered to determine this interval. These are, for example, measurement uncertainties, regulations and directives, application conditions and application frequency.
- What is the difference between a calibration and a verification?
Verification consists of the comparison carried out by a competent body. In certain applications this verification is mandatory. A calibration, on the other hand, consists of regular checking of measuring instruments. A traceable pattern is used, that is, in accordance with the national standard; It is carried out by an accredited competent body and involves the estimation of a measurement uncertainty. Both procedures only describe the checking of the display quality and not its adjustment.
- What is a pattern?
A standard is a material or a measuring device for the purpose of determining a unit or several values for its materialization, conservation and reproduction. A standard manometer is a highly accurate manometer that is applied to detect differences between the pressure values of the instrument to be tested and the standard.
- What is a work pattern?
It is a standard that is routinely used to calibrate or control materialized measurements, measuring instruments or reference materials. A working standard is normally calibrated with a reference standard. A working pattern that is used in practice to ensure correct measurements is a check pattern or secondary pattern.
- What is a reference standard?
A general standard of the highest accuracy available at a given location and/or organization that serves to derive measurements made at that location.