User Tools

Site Tools


glossary:glossary_p

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision
Previous revision
glossary:glossary_p [2020/12/07 17:20] – [Progressive cab control] correct reference JohnFletcherglossary:glossary_p [2021/08/08 05:25] (current) – Changed the entry to PM Wayne
Line 8: Line 8:
  
     - Pertaining to the shunt connection of components or circuits.     - Pertaining to the shunt connection of components or circuits.
-    - Pertaining to the type of operation in a computer when all elements in an information item (e.g., bits in a word) are acted upon simultaneously, rather than serially (one at a time+    - Pertaining to the type of operation in a computer when all elements in an information item (e.g., bits in a word) are acted upon simultaneously, rather than serially (one at a time)
     - The condition in which two comparably sized objects or figures are equidistant at all facing points parallel).\\      - The condition in which two comparably sized objects or figures are equidistant at all facing points parallel).\\ 
  
Line 54: Line 54:
 [[wp>Polylactic_acid|Polylactic Acid]] a plastic used in 3D printing\\  [[wp>Polylactic_acid|Polylactic Acid]] a plastic used in 3D printing\\ 
 [[wp>Programmable_logic_array|Programmable Logic Array]] a kind of programmable logic device used to implement combinational logic circuits. [[wp>Programmable_logic_array|Programmable Logic Array]] a kind of programmable logic device used to implement combinational logic circuits.
-===== PM - Phase Modulation =====+===== PM =====
  
 +====  Phase Modulation ====
 Phase Modulation. A specialist modulation mainly used in Radar equipment, the phase rather than the frequency of the carrier wave is varied in order to obtain information Phase Modulation. A specialist modulation mainly used in Radar equipment, the phase rather than the frequency of the carrier wave is varied in order to obtain information
  
  
-===== PM - Pulse Modulation =====+==== Pulse Modulation ====
  
  
Line 162: Line 163:
  
  
-The means to facilitate manually driven trains following one another on the same track but in different electrical sections powered by different controllers. (See MERG Journal Winter 2005 page 10)+The means to facilitate manually driven trains following one another on the same track but in different electrical sections powered by different controllers. (See MERG Journal Autumn 2005 page 10 (August 2005) and Winter 2005 (January 2006) page 10 )
  
  
Line 188: Line 189:
  
  
-Can be any shape and is normally a short period of time+Can be any shape and is normally a short period of time. A rapid change of voltage or signal for a short duration. 
  
  
  
-===== Pulse Width Modulation =====+===== PWM =====
  
 Pulse Width Modulation is a technique used to control devices such as motors and lights to vary the amount of power supplied to the device. The power supply to the device is switched between off and on such that the average power to the device can be varied between 0% - always off to 100% - always on. For example if the wave form is switched so that a motor is connected to power supply for 75% of the time then it will receive approximately 75% power and run at a slower speed. The frequency at which the switching takes place will affect the behaviour of the motor but is typically between 100Hz and 20KHz. Pulse Width Modulation is a technique used to control devices such as motors and lights to vary the amount of power supplied to the device. The power supply to the device is switched between off and on such that the average power to the device can be varied between 0% - always off to 100% - always on. For example if the wave form is switched so that a motor is connected to power supply for 75% of the time then it will receive approximately 75% power and run at a slower speed. The frequency at which the switching takes place will affect the behaviour of the motor but is typically between 100Hz and 20KHz.
glossary/glossary_p.1607361655.txt.gz · Last modified: 2020/12/07 17:20 by JohnFletcher

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki