Calibration Interval Adjustment of a Measuring Instrument in Industries During Long-term Use

Abstract

Abstract. Calibration interval adjustment of measuring instruments is one of the urgent tasks in industries. The article represents the calibration interval calculation of the potentiometer PCB-4P according to the verifications for the 4 year period of the Metrological Department in the aviation plant. The calibration interval is shown to be increased according to the calculation of its reliability and stability of metrological characteristics.

Torque motor tape winding characteristics and its connection with design parameters

“…Besides, as shown previously [6][7][8], the magnetic flux density also depends on the pole pairs number of the magnetic system. Also in [6] it is indicated that for a given tape width the value of the double integral ) , , ( 0 I y x D remains practically constant when the pairs of poles number of the magnetic system changes.…”

Measuring Equipment Calibration and Determination of the Initial Calibration Interval

“…Optimal calibration intervals are those which can be established to provide measurement reliability objectives in maximum periods between adjacent calibrations. The process for determination of optimal interval is a statistical process, requiring accurate and sufficient data taken during the monitoring of equipment behavior [9], [11]- [13].…”

“…There appears to be no universally applicable single best practice for establishing and adjusting the calibration intervals, which is why every laboratory needs to be familiar with its equipment measuring parameters and understand the calibration interval determination process. Also, for the range of measuring instruments, no single method is ideally suited [4], [11]- [13].…”

“…Once the initial calibration interval has been established, which relied on the adequate impact factors, but also on "engineering intuition", to optimize the balance of risks and costs, this interval must be adjusted in later use, taking into the account monitored instrument behavior [9]- [11].…”

Decrease uncertainty of measuring small differential signal against large common-mode signal

“…A method of measurements by comparison against an actual measure is commonly used providing a comparison of the value to be measured u x (t) and the value of calibration signal u 0 (t) reproduced by measure. The practical implementation of this method including bridge and differentiation circuits requires the availability of high-sensitivity comparators possessing a resolution that, in large part, defines the uncertainty of measurements [3][4][5][6][7][8].…”