Pulse generator
Device which gives out pulses with a prescribed frequency at the output when a signal is pending at the input.
Frequency analysis
Determination of the composition of noise in relation to individual frequencies. Normally the measurement is made in steps of one octave (frequency doubling, octave band).
Required filtration grade
In principle, filtering should as be fine as necessary, not as fine as possible. In general the filtration grade is defined by the manufacturer of the related device. These days this information is so
Spring assisted sealing elements
A sleeve made of certain elastomers (e.g. fluoroplastics) contains a spring made of stainless steel that provides defined, constant sealing forces (Figure F 2) . Spring assisted sealing elements are u
Pressure flow
Flow that is produced in the gap between two chambers with different pressures p 1 and p 2.
Pressure difference
Difference between two pressures p 1 and p 2 : If the pressure difference is the measured variable it is called the differential pressure p 1,2 (DIN 24 312).
Throttling point
Location in a device at which the flow cross-section is constricted and therefore a throttle effect (increase in resistance) occurs.
Damping D
Measure of the decay of an oscillation in a delay element of second order. D = 0 signifies an undamped continuous oscillation and D = 1 an aperiodic oscillation (Figure D 5). For reasons related to co