You'd think the iPhone panopticon would make two-party consent laws look antiquated. Yet some states are enforcing them more vigorously than ever. In Illinois, for example, civil-liberties advocates are challenging a law that says you can be thrown in jail for 15 years for recording a conversation with a police officer.
The use of weighting networks gives a single number as a measure of vibration exposure and is expressed as the frequency-weighted vibration exposure in metres per second squared (m/s2), units of acceleration. Vibration meters equipped with accelerometers can be used for instantaneous vibration measurement.
System attributes and characteristics of the signals of interest, such as the vibration type, system type, and signal frequency range, determine the transducer to use to obtain vibration signals. Use a displacement transducer, such as a proximity probe, for measuring relative vibrations. Use an accelerometer for measuring absolute vibrations. For example, if the vibration you are monitoring is a signal such as the relative displacement from a shaft or the relative displacement from a bearing clearance, then you need to use a proximity probe.