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 [2018/11/07 09:49] – [PiSo] Bob Vetterleinglossary: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).\\ 
  
 ===== PCB ===== ===== PCB =====
  
-Printed Circuit Board. Are usually made of [[http://en.wikipedia.org/wiki/FR-4|Fibreglass]] or [[http://en.wikipedia.org/wiki/FR-2|SRBP]] (Synthetic Resin Bonded Paper) with a copper laminate on one or both sides, forming the electrical circuit. A detailed Wikipedia article is available [[http://en.wikipedia.org/wiki/Printed_circuit_board|here]]. Most MERG [[glossary_k#kits|Kits]] contain a PCB, the majority of them are single sided through hole construction. As the electronics become more sophisticated so double sided and surface mount technologies are being introduced.+Printed Circuit Board. Are usually made of [[wp>FR-4|Fibreglass]] or [[wp>FR-2|SRBP]] (Synthetic Resin Bonded Paper) with a copper laminate on one or both sides, forming the electrical circuit. A detailed Wikipedia article is available [[wp>Printed_circuit_board|here]]. Most MERG [[glossary_k#kits|Kits]] contain a PCB, the majority of them are single sided through hole construction. As the electronics become more sophisticated so double sided and surface mount technologies are being introduced.
  
  
Line 53: Line 53:
 =====PLA===== =====PLA=====
 [[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 Aray]] 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 80: Line 81:
  
  
-Solenoid Point motor /relay driver with onboard relay see TBG16/26+Solenoid Point motor /relay driver with on board relay see TBG16/26
  
 ===== PMP ===== ===== PMP =====
Line 118: Line 119:
     - The orientation of the positive and negative poles in a battery or power supply relative to a circuit.     - The orientation of the positive and negative poles in a battery or power supply relative to a circuit.
     - The orientation of a magnetic field, relative to the surrounding environment.     - The orientation of a magnetic field, relative to the surrounding environment.
 +
 +
 +===== POR =====
 +
 +
 +
 +Power ON reset i.e. just turning the power on to the whole system.
  
  
Line 124: Line 132:
  
 Abbreviation for Potentiometer see below Abbreviation for Potentiometer see below
 +
  
  
Line 154: 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 August 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 171: Line 180:
 Multiplex system using a RS485 bus, matching pairs of input and output modules communicate under the control of a master module.\\  Multiplex system using a RS485 bus, matching pairs of input and output modules communicate under the control of a master module.\\ 
 For details see these TBs: For details see these TBs:
-[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1054&userid=62|LC02/01]],  +[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1054|LC02/01]],  
-[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1055&userid=62|LC02/02]],  +[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1055|LC02/02]],  
-[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1056&userid=62|LC02/03]],  +[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1056|LC02/03]],  
-[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1066&userid=62|LC02/04]] &  +[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1066|LC02/04]] &  
-[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1067&userid=62|LC02/05]].\\ +[[http://www.merg.org.uk/merg_tbs/download.php?fileid=1067|LC02/05]].\\ 
  
 ===== Pulse ===== ===== Pulse =====
  
  
-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.1541584181.txt.gz · Last modified: 2018/11/07 09:49 by Bob Vetterlein

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki