Measuring range
(VDI 2600). As far measuring instruments with displays are concerned, the measuring range only covers the part of the scale which makes it possible to comply with the error limit defined by the class of [...] values for the input signal from a measuring instrument (the measured variable ) which in accordance with the characteristic curve for this measuring instrument is unique and formed within specified error [...] the basis of values for the output signal . Measuring instruments may have several measuring ranges with different error limits. A device for changing the measuring range (e.g. measuring range converter)
Fluid mechanics
Concerned with the physical characteristics and behaviour of fluids at rest (hydrostatics) and when moving (hydrokinetics)
Computer controls
Collective term for machine controls, which work with computers, such as CNC , DNC, PLC, etc..
Piston machines
Hydrostatic displacement machines , displacement chamber machines , pump with banked pistons/in-line piston pump
Pressure control characteristic
Changes in the pressure due to a change in the inlet pressure with a given flow.
Roller lever
A lever with a roller, which transfers a switching movement to the element to be moved.
Control characteristic
Transfer function of the subsystem with respect to changes to the correcting variable (DIN 19 226).
Switching
Process with the aim of triggering a certain movement (function) by actuating individual valves or controls .
Quad-ring
Toroidal ring made of elastic materials, with an almost square cross-section ( Figure Q 1 ).
Phase delay
The time delay τ between two sine oscillations with the frequency f ( Figure P 7 ):