Quasi-static vs dynamic measurement type

What is a quasi-static measurement and how does it differ from a dynamic measurement?

Piezoelectric technology is a measurement technology that is particularly suitable for measuring dynamic processes. However, piezoelectric technolgy is not limited to the measurement of dynamic events, it can accurately capture quasi-static processes as well. In piezoelectric measurement technology therefore, a distinction is drawn between quasi-static and dynamic measurement modes.

In piezoelectric measurement technology, the insulation resistance is of great importance. The greater the insulation resistance in the system,
the smaller the signal drift. If it were possible in reality to achieve infinitely high insulation resistances, static events. e.g. a weight measurement over several days or weeks could easily be recorded with piezoelectric measurement technology. In reality, the described insulation resistance is never infinitely high, which always results in a very small signal drift. In this case, one speaks of a "quasi-static" measurement.

The measurement of fast events, such as the acceleration measurement of a vehicle on a proving ground, is called dynamic measurement. Due to the dynamics of the event, the insulation resistance in the system plays a subordinate role.

The lower frequency range of the measurement in particular is significantly determined by the charge amplifier and the settings made. The decisive elements are the time constant (add link to glossary "time constant") and the time constant resistance (add link to glossary "time constant resistance"). 

Transient or dynamic signals are acquired with short time constant (add link to glossary "time constant"). For static or quasi-static signals that are to be recorded over a longer period of time, the setting "long" (add link to glossary "time constant") is selected with advantage.

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