AMETEK 955D LDT - Manual (Page 11)

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Active Stroke Area
The area on the extrusion between the Null Zone and Dead Band on which the magnet assembly
moves.
Dead Band
An area usually 2.0” 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.
External Device
A device wired to the LDT which generates external interrogations.
External Interrogations
Pulses sent from an external device to the LDT, usually to initiate a pulse sequence.
Null Zone
An area usually covering 3.00” on the extrusion beginning at the connector end.
LDT
Linear Displacement Transducer.
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.
Wire Speed
The average time it takes a pulse to travel one inch on the LDT’s wire.
Recirculations
The method used to improve the resolution of a system using a digital LDT. The “on” Time of a
pulse width output is multiplied by a specifi c factor (from 1-127). This multiplication provides more
counting time for the counter in the customer’s electronics, thus improving the resolution. The only
disadvantage to the higher recirculation numbers is the time needed to process the signal.
Return (Stop) Pulse
A pulse generated by the BRIK to determine the location of the magnet assembly on the extrusion.
Start Pulse
A pulse generated by either an external device or the LDT to start a pulse sequence.
Stop Pulse
(See Return Pulse)
955D Glossary