In the past
In the past, the micro-processors available on the market were not sufficiently powerful for measuring and simultaneously calculating the various parameters.
It was therefore only feasible to carry out random measurements with older measuring devices. In other words measurements were taken for a number of cycles, measuring was subsequently stopped and the values were calculated. No further measurements were taken during processing. This meant that measurements were only taken for a few periods out of 50 periods.
„Every measuring device measures constantly, doesn't it..."
In the present
With the new product families, such as the UMG 96RM, UMG 104, UMG 604, UMG 605, UMG 508, UMG 511, leading-edge microprocessors are used with an entirely new architecture, integrated performance scope and considerably higher capacities.
Such processors were not available in the past! These processors are more expensive than conventional processors, which are still widely used in many simple measuring devices. With the aforementioned product families, constant and gapeless measurement takes place. In this case all periods are captured, i.e. measurements are taken during 50 periods out of 50. In parallel to this, the data is processed and the various electrical, PQ and energy parameters are calculated.
It is self-evident that considerably better measurement accuracy is attained. It is also necessary to consider that random measurement can lead to considerable deviations in the measurement results and the energy measurement in the event of rapid load changes (e.g. spot welding).
Simple measuring devices and measuring devices with economical or older measuring electronics are still available for random measurement. If one looks at the global market, random measurement is in fact dominant and remains current engineering practice!
It is also frequently the case that energy is measured constantly, although all other values are not acquired constantly but rather on a random sampling basis.
Constant measurement requires higher quality components. By constantly measuring all values, a considerably higher accuracy of measurement is attained.