Using Phase Relationships to Find an Unknown Capacitance in an RC Circuit
Student Manual | This task deals with the determination of an unknown capacitance inside an RC series circuit. You are provided with a Labview file (rcphase.vi) that communicates with a circuit already laid out for you on a breadboard. You can control the input frequency (preferably between 1 and 50 Hz) and will observe the sinusoidal voltages developed across the resistor R and the input voltage. These waveforms will be shifted in time through ∆t. Hence there will be a phase difference ϕ = ω∆t where ω = 2πf, and f is the input frequency in Hz. |
Software Code | Download |
Experiment Code | 1.6C |
Version | 6 January 2016, 2016-v1 |
Further Readings and References
Pictorial Procedure
Finding an Unknown Resistance in Series with a Capacitor
Student Manual | An experiment has been set up for you. The arrangement is similar to what is provided in |
Software Code | Download |
Experiment Code | 1.6B |
Version | 10 December 2015-2015-v1 |
Further Readings and References
Pictorial Procedure
Data analysis with capacitor
Student Manual | The main objective of this experiment is to investigate the time needed to discharge a capacitor and determine the RC time constant of an RC series circuit. Students will also practice how to generate and acquire a signal using the data acquisition system. The voltage across resistor and capacitor will determine the value of the unknown resistor/capacitor. |
Software Code | Download |
Sample Results | Charging of the capacitor Discharging of capacitor Curve fitting discharging capacitor |
Experiment Code | 1.6A |
Version | 14 September 2014, 2015-v2 |
Further Readings and References
Pictorial Procedure
Data Acquisition and Filter Design
Student Manual | This is a veiled introduction to data acquisition. Furthermore, students will be exposed to the ideas of filtering, noise, sampling and autocorrelation.Students will be required to analyze the autocorrelation of the noise signal, generated from a pseudorandom binary signal. This will be followed by low-pass filtering using a simple RC circuit and calculating the autocorrelation of the filtered signal. |
Software Code | Download |
Sample Results | Gain of a low pass filter as a function of frequency Circuit for pseudo-random noise generation based on shift registers |
Experiment Code | 1.6 |
Version | 1st October 2008 |
Further Readings and References
- Signal enhancement in the presence of high noise levels: the electrocardiogram
The Physics Teacher , A. Thompson and A. Trolestra , 34 418 , (1996). - Noise reduction by signal accumulation
The Physics Teacher , Y. Kraftmakher , 44 528 , (2006). - Autocorrelation of electrical noise: an undergraduate experiment
American Journal of Physics , J.L Passmore, B.C. Collings, P.J. Collings , 63 592 , (1995). - A course in computer based data acquisition
American Journal of Physics , W.N. Hubin , 70 80 , (2002). - Two student experiments on electrical fluctuations
American Journal of Physics , Y. Kraftmakher , 63 932 , (1995).