The difference between the damping time of instruments and the filtering time of DCS systems
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A parameter found in common smart meters is the damping time. From posts on forums, it was learned that this parameter affects the sensitivity of the meter as well as the magnitude of its fluctuations: a longer damping time results in a slower response from the meter, but the output remains stable with minimal fluctuations, while a shorter damping time leads to a faster response, but greater fluctuations are more likely to occur. The PKS system of Honeywell contains a filtering time in the analog data processing block DACA; tests have shown that this serves to enable the algorithm and data processing to gradually approach a steady-state value. But it’s a bit hard to understand when some instruments have damping time and filtering time as well?
I think the filtering time is used for processing the signal later on, in order to prevent frequent fluctuations during the process. For example, when using DCS control, the curve has ‘ripples’, and a filtering time can be added.
Define it yourself on Baidu; I understand that the longer the damping time, the slower the instrument’s response and the worse the timeliness of the data, but its resistance to signal fluctuations is greater. The shorter the damping time, the faster the instrument’s response and the better the timeliness of the data, but its resistance to signal fluctuations is weaker. These aspects are contradictory to each other, so an optimal parameter needs to be chosen through compromise. Generally, this is suggested by the manufacturer, and I’m not entirely sure about the specific values for different instruments. The damping time usually refers to the side of the field instrument, that is, the performance of the instrument itself. Filtering primarily involves processing the acquired signals in order to remove interference signals and noise; it represents further signal processing on the side of the control system. The two aren’t related in any way; it’s simply filtering in a broad sense. Perhaps they serve similar purposes in terms of limiting signal fluctuations and adjusting damping