glossary:glossary_p
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glossary:glossary_p [2020/12/07 17:27] – [Progressive cab control] expand references JohnFletcher | glossary:glossary_p [2021/08/08 05:25] (current) – Changed the entry to PM Wayne | ||
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- 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, | + | - 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, |
- 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).\\ | ||
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[[wp> | [[wp> | ||
[[wp> | [[wp> | ||
- | ===== 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 ==== |
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- | 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.1607362057.txt.gz · Last modified: 2020/12/07 17:27 by JohnFletcher