1 / 7

Some Concepts from the Labs 22 Feb. 2005 RC Filter and LabVIEW lab

Explore concepts like RMS value, function generators, oscilloscope probes with LabVIEW. Learn practical applications & calculations in electrical engineering labs.

hibbard
Download Presentation

Some Concepts from the Labs 22 Feb. 2005 RC Filter and LabVIEW lab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Some Concepts from the Labs 22 Feb. 2005 RC Filter and LabVIEW lab Function generator and internal resistance Root-Mean-Square (rms) value of a sinusoidal voltage Oscilloscope 10:1 probe as a voltage divider

  2. High-pass first-order RC filter + + C V R V out in - - Figure 1. RC filter with series capacitor and output resistor R. v v in out Figure 2. Two - port circuit.

  3. LabVIEW front panel LabVIEW Block Diagram For examples of the LabVIEW computer displays And an overview of the use of LabVIEW, see Figs. 9.22 and 9.23, and Sec. 9.4 in Hambley

  4. Function Generator and Internal Resistance The function generators in the lab have an internal resistance (think “Thevenin resistance) of 50 ohms. Their output voltage indication is calibrated assuming that you have a 50-ohm load connected. So if the indication of amplitude says 1 volt peak- to-peak, what is the actual open-circuit zero-to-peak output voltage?

  5. Root-Mean-Square (rms) value of a sinusoidal voltage It is usual in discussing sinusoidal voltages to refer to the effective value of the voltage – the voltage of a DC source that would produce that same power dissipation in a resistor R as the Sinusoidal voltage would. This effective voltage is called the root-mean-square(rms) voltage, Vrms. Your text (Hambley, 3rd ed.) goes through the analysis on pp. 191-3 to show that applying this condition on average power dissipation yields the result For example, if Vrms for the 60 Hz voltage at an outlet in a house is 120 volts, the peak value of the sinusoidal voltage is 170 volts.

  6. Oscilloscope Probe as a Voltage Divider Your 10:1 oscilloscope probe is designed to protect the ‘scope from having too high a voltage presented at its input. The probe contains a 10:1 voltage divider that reduces the voltage at the probe tip to 1/10th of the voltage at the tip, which then appears at the input to the ‘scope. (Note: This means that the 10:1 probe can’t be used as if it were an ordinary cable to connect pieces of equipment.)

More Related