Difference between revisions of "Electronics bootcamp II: feedback systems"
From Course Wiki
(→Time and frequency response of a feedback system) |
(→Time and frequency response of a feedback system) |
||
Line 10: | Line 10: | ||
!Critically damped | !Critically damped | ||
|- | |- | ||
− | | [[File:Overdamped second-order time response. | + | | [[File:Overdamped second-order time response.jpg|250px]] |
− | | [[File:Critically damped second-order time response. | + | | [[File:Critically damped second-order time response.jpg|250px]] |
|- | |- | ||
!Slightly underdamped | !Slightly underdamped | ||
!Underdamped | !Underdamped | ||
|- | |- | ||
− | | [[File:Slightly underdamped second-order time response. | + | | [[File:Slightly underdamped second-order time response.jpg|250px]] |
− | | [[File:Underamped second-order time response. | + | | [[File:Underamped second-order time response.jpg|250px]] |
|} | |} | ||
</center> | </center> |
Revision as of 02:24, 28 October 2018
--Steven Wasserman (talk) 21:14, 27 October 2018 (CDT)
Time and frequency response of a feedback system
Overdamped | Critically damped |
---|---|
Slightly underdamped | Underdamped |
- Construct the circuit shown in the diagram below
- Connect the output of a signal generator to channel 1 of an oscilloscope and also to the input of your circuit.
- Connect the output of your circuit to channel 2 of the oscilloscope.
- Set the function generator to produce a 100 Hz, square wave output with an amplitude of 100 mV.
- Adjust Rgain so that the system response is slightly overdamped.
- Measure the frequency response of the system as you did in part 1 of the electronics bootcamp.
- Find the transfer function, the undamped natural frequency, and the damping coefficient.
- Plot the data and transfer function (as you did in part 1)
- Adjust Rgain so that the circuit is critically damped and repeat steps 6-8.
- To ensure that the system is critically damped, turn the potentiometer knob until you see a slight overshoot in the response and then turn it back until the overshoot just disappears.
- Adjust Rgain so that the circuit is slightly underdamped (two or three overshoots) and repeat steps 6-8.
- Adjust Rgain so that the circuit is underdamped with at least a dozen or so overshoots and repeat steps 6-8.