Glossary
Glossary
Installation, Programming and Maintenance Manual
19
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 1.5” 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 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 wire.
Zero Pulse
By sending a signal to the probe at any time in the stroke a new zero point
can be established.
