adjustment
Under adjustment - and adjustment - is meant the exact possible setting by an expert intervention. It is preferably a matter of setting a measuring device or its display .
Adjustment is often necessary with mechanical measuring devices after impacts or if the ambient conditions change noticeably. For measurements that exhaust the potential of a measuring device, it is recommended that the adjustment status be checked frequently .
Terms in measurement technology
adjustment
According to the standardization , adjustment is defined as follows: “ Setting or adjusting a measuring device in order to eliminate systematic deviations as far as is necessary for the intended application. - Adjustment requires an intervention that permanently changes the measuring device. "
During adjustment, measured values of a measuring device are set to known values (e.g. by comparison with standards ). The most important settings are those of the zero point and the sensitivity . The measuring device must be operated under prescribed or agreed reference conditions (external conditions such as temperature, position, etc.). Thereafter, the measuring device deviations must be within the specified error limits .
Under readjustment is meant a slight or truncated procedure which z. B. is required if the temperature change persists.
Calibration, verification
The adjustment is to be distinguished from the calibration that a calibration is, and is performed without intervention into the meter.
Where the use of calibrated measuring devices is prescribed ( measuring equipment monitoring ), a check must be carried out and certified after the adjustment. In the case of a determination connected with the calibration, to what extent a measuring device satisfies the specified regulations, one speaks of calibration according to a calibration regulation in the case of legal competence .
Action
Adjustment is carried out mechanically by setting adjustment screws , electrically by setting potentiometers or electronically by setting stored data. If there are several setting elements, an iterative procedure is often necessary so that settings have to be repeated until the result is satisfactory at all measuring points. Automatic or software compensation is also increasingly taking place.
Examples
- Misadjusted balance : Adjustment with test weights and intervention in the mechanics of the balance or with an adjustment program.
- Misaligned vial : Adjustment to the prescribed position by repositioning the vial (180 ° rotation on approx. Horizontal surface, or turning the theodolite ) by 180 °. Half of the deflection is removed with the rectifying or adjusting screws (the other half is the slope of the base).
Adjustment of coins
In the coin production of Kurant coins , adjustment used to be understood as the mass comparison of the slightly overweight gold or silver discs to the legally prescribed target weight within a small tolerance in the milligram range. This was usually done by filing and constant re-weighing - manually, coin by coin in the mint, whereby the precious metal shavings were collected separately, stored and later melted down again. Often the adjustment marks (file grooves) were not always completely removed by the subsequent embossing process, so that some of them remained visible. In theory, however, this does not reduce the collector's value of such a coin, but rather guarantees authenticity. In coin auction catalogs, the description of the coins in question states "slight adjustment marks" or possibly "strong adjustment marks", which consequently leads to more or less large discounts. The coin with adjustment marks must not be confused with a "scratched" one. On some coins from the 18th and 19th centuries, the word "justi (e) rt" is still explicitly used. From around 1870 onwards, modern round blank production is so precise in terms of weight that the thickness of the zinc sheet strips are accurate to almost a hundredth of a millimeter, so that special manual adjustment has become superfluous. It is therefore only re-weighed and blanks with the wrong weight are separated out before embossing and melted down again. See also rough weight , fine weight .
Individual evidence
- ↑ DIN 1319-1: 1995 Fundamentals of measurement technology - Part 1: Basic terms .
- ^ Albert Weckenmann: Coordinate Metrology: Flexible Measuring Strategies for Dimension, Form and Position , Hanser, 2012.
- ↑ Roland Nater, Arthur Reichmuth, Roman Schwartz, Michael Borys, Panagiotis Zervos: Wägelexikon: Guide to Weighing Terms , Springer, 2008.
- ↑ Helmut Kahnt, Bernd Knorr: Old dimensions, coins and weights. A lexicon. Bibliographisches Institut, Leipzig 1986, licensed edition Mannheim / Vienna / Zurich 1987, ISBN 3-411-02148-9 , p. 385.