a) Note that the switches on the \"Switch Board\" are \"debounced\". What does t
ID: 2079458 • Letter: A
Question
a) Note that the switches on the "Switch Board" are "debounced". What does that mean?
b )Why is the “propagation delay” of the device an important parameter?
c) What does “DC coupled” mean on the oscilloscopes, and why do the scopes have to be "DC coupled" when used in this experiment of signal generation?
d Explain what is meant by AC coupling on an oscilloscope.
e) When do you think the scope should be used to measure electrical signals and when should the multimeter be used?
f )Do multimeters have AC and DC coupling like the oscilloscope?
Explanation / Answer
a.) It means, if a turn on signal/pulse is fed to a switch, 'debouncer circuit' makes it sure that the transition in voltage level of that pulse does not occur, untill another turn on/ turn off pulse is provided.
b.) Propagation Delay is the almost half reflex time of any device, it is the amount of time by any signal to travel from sender end to receiver end. And ultimately we want faster reflex for every device.
c.) DC coupled means the channel output you are viewing on the scope is dominatly showing DC component present on that channel.
Example and answer of why signal generation experiments needs dc coupling- suppose you need to generate a square wave waveform for some experiment, but practically speaking every function generator itself requires mains 50-60Hz supply, from which then using rectifier and filters a dc waveform is obtained, which is then processed to make desired waveform, but certainly the non idealites present makes high frequency ac signal to be there (know as distortion or noise) which if you want to see, can turn on AC coupling on your oscilloscope.
d.) I hope i answered it just know.
e.) When you are designing any electrical circuit (example- inverter) with switches (ex-MOSFET) in it, you would like to see a number of waveforms using oscilloscope, like gating pulses to each MOSFET, the dead band in these gating pulse, current waveshape across each mosfet, etc. and not just the magnitude of current flowing through it.
you can use scope and multimeter, both for magnitude calculation purpose but multimeter's response time is fast and no calculations required at all.
f.) The fact to keep in mind is: On a voltmeter - the AC or DC setting refers to a measurement MODE or FUNCTION. On an oscilloscope, it refers to the channel COUPLING, not the measurement mode or function.
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