AMETEK 955DQ Brik LDT - Manual (Page 22)

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Active Stroke Area The area on the extrusion between the Null and Dead Zone on which the magnet assembly
moves.
Burst Input An input signal to the probe will cause a “burst” of data, representing the absolute position to be
fed to the controller.
Dead Zone An area usually 2” from the end of the extrusion where sensing of the magnet is not possible.
Floating Magnet A non-ferrous assembly that contains the magnet that moves across the LDT’s sensing surface
in a non-contact manner.
Incremental A relative position feedback device whose signal is always referenced to the zero position. The
LDT produces a digital, square wave pulse train that is fed into an up/down counter chip or
clock to derive position.
Input Type Used to determine input type for “burst” and “zero” modes. i.e.; sinking, sourcing or TTL.
Non-volatile Position is held in memory and will not be lost on power down.
Null Zone An area usually covering 3.00” on the extrusion beginning at the connector end.
Output Driver Used to determine output type of A, B and Z.
Output Resolution Used to determine amount of pulses per inch.
Quadrature Two output channels out of phase by 90 electrical degrees.
Quadrature Cycle Output Frequency The maximum frequency at which the pulse rate is transmitted out of the probe.
RS-422 Differential Differential line driver.
Slide Magnet Assembly A non-ferrous assembly that moves across the LDT’s sensing surface.
Unipolar A power supply that provides a single voltage.
Volatile Position held in memory that is lost on power down.
Wire Speed The average time it takes a pulse to travel one inch on the LDT’s wire.
Zero Pulse By sending a signal to the probe at any time in the stroke a new zero point can be established.
955DQ Glossary