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Designed an RC circuit to simulate the behavior of the voltage under time of a capacitor and calculated time constant in order to use oscill8iscope for proper measurements.
The capacitor was hooked up to the scope for further measurement. A 5V input DC sourced the power to the circuit via a bench power supply.
The wiring was done by putting an 100uF Capacitor rated at 50V in series with a 2kohm resistor. The resistor was hooked up to ground and a reset button.
*correction: polarization is correct but curl should be on the neg side and straight line on the pos. side
The result was a smooth discharge in an exponential decay behavior and when the charge button was pressed, the behavior of the voltage on the capacitor had an exponential growth behavior
RC time constant calculation
R = 2kohm
C = 100uF
tau = 2kohm*100uF = 0.2s
This means it takes 0.2s for this RC circuit to reach 63.2% of the 5V that was inputted.
This also allows us to get a clear and smooth signal for when setting up the oscilloscope's settings.
DEMO
IMG_1354.MOVMeasurements
Using the Measure button on the osciolloscope
The Rise time = 0.44s
This is the same as out calculations. We said that from 0 to 63% our time constant for our RC circuit was 0.2s
If this is true then our time from 20% to 80% will be 1.4*tau = 1.4*0.2 = 0.28s
and from 10% to 90% our time constant will be 2.2^*tau = 0.44s which is the same as the scope measurement
Here we have triggered the scope to record on rise, endge, DC coupling, and with a 100ns holdoff.
The Rise time measuremnt with the number below which sats RT=0.440s, consistent with calculations.
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