Signals Flashcards
What are circles measured in?
Radians
What is an oscilliscope used for?
To look at waveforms
What is a hertz?
Full rotations of a circle against a wave per second
In digital waveforms, what is the distance between crests called?
Duration
What is noise?
Lots of signals interacting and interfering with each other
What is bandwidth?
The data transfer capacity of a network
What does PWM stand for? What is it?
Pulse Width Modulation
When the width of the pulsed carrier signal is varied according to the amplitude of the message signal
What is modulation?
Where data is converted into electrical signals suitable for transmission
What does PAM stand for? What is it?
Pulse Amplitude Modulation
Where the amplitude of the pulsed carrier signal is varied according to the amplitude of the message signal
What are factors of analogue signals that are better than digital signals?
More accurate
Less bandwidth used
What are factors of analogue signals that are worse than digital signals?
More difficult to understand
Not encrypted
Slower transmission rate
What is UK AC frequency?
50 Hz
Why are cutters on a milling machine offset?
To avoid producing noise/chatter
What is frequency?
1 Hz = 1 full rotation of a sine wave against time
What is a sinusoidal wave?
A sine wave
What do schematics show?
Individual components in a circuit/system and how they connect together
What is the BS standard for circuit symbols?
BS 3939
What do wiring diagrams show?
Both physical connections and layout of circuits/systems
What do the words pneumatic and hydraulic mean?
Pneumatic: fluid (oil/water)
Hydraulic: air
What are pneumatic control systems?
Systems that use compressed air as the power and signal transmission medium
What are hydraulic control systems?
Systems that use liquid as the power and signal transmission medium
