Measuring with an oscilloscope, Electrical Engineering

Assignment Help:

1. Introduction:

Theory:  The voltage measured across a load follows the Ohm's law which says that the current passing through a conductor between two points is directly proportional to the potential difference across the two points.

V α I   => V = I.R   (where R is proportionality constant)

R is known as resistance and it changes with material and temperature of conductor

Material Required: Oscilloscope, frequency generator, connecting wires, resistor, multimeter.

Description and Aim: To measure voltage using an oscilloscope and determine current and impedance by using Ohm's law.

For this exercise, the voltage drop across the resistance is measured. The measured voltage value is divided by resistance value to get the value of current.

I = V / R

2. Method:

Step 1) First, pick the resistor and place it on the circuit board. It is connected in series with the other circuit. To ensure that R2 and L2 does not short, the two scope probes and the ADD-INVERT method are used.

Step 2) Connect the channel 1 input to the side of the component with the greatest potential. The channel 2 input is connected to the other side. Connect ground clips on the oscilloscope probes to the common port of generator (black lead).

Step3) Invert channel 2 and switch vertical mode to ADD. The display on the oscilloscope shows the voltage drop across the component.

Step 4) Use oscilloscope to measure peak-to-peak voltage across R2, and calculate the total circuit current (I).

Step 5) Replace the two post connector across sensing resistor R2. Now use Add-Invert method to measure voltage drop across R1.

Step 6) Connect Channel 1 probe to left side of R1, and channel 2 probe to other side of R1.

Step 7) Set both channel vertical input attenuators to display 2.0 V/div. Select channel 2 INVERT function on the oscilloscope. Set vertical mode to ADD. Measure Vpk-pk across R1.

3. Results: (please correct them)

V = IR

I = V / R

I = V2/R2   = 200/ 10 = 20 mA (pk-pk)

4. Discussion:

Using the INVERT-ADD mode of oscilloscope measurement of current is done. Concept is measuring the maximum potential difference across the series path and subtracting the potential difference due to second resistance. Using current and potential difference we can find unknown impedance. Since resistance doesn't introduce any phase difference between current and voltage across it, this way is easier way to compute an accurate resistance value.


Related Discussions:- Measuring with an oscilloscope

Electromechanical energy conversion and device, importance of electromechan...

importance of electromechanical energy conversion and device in electrical engineering

#title.ec 1., draw the gain frequency response of an RC coupled circuit? di...

draw the gain frequency response of an RC coupled circuit? discuss fall in gain at very low and very high frequencies?

EEE, ferroelectric materials are charatrised by

ferroelectric materials are charatrised by

Develop an analog computer simulation diagram, Q. Develop an analog compute...

Q. Develop an analog computer simulation diagram to solve the differential equation with y(0) = 2 and ? y(0) = 0.

How typical dma controller can be interfaced to 8086/8085, Show how a typic...

Show how a typical DMA controller can be interfaced to an 8086/8085 based maximum mode system. For 8088 in maximum mode: The RQ/GT1 and RQ/GT0 pins are utilized to issue DMA

Sketch a graph comparing the fcc class, a) In the United States, the Federa...

a) In the United States, the Federal Communications Commission (FCC) is charged with the regulation of radio and wire communication (FCC part 15). It basically sets limits on the

Comparison between motorola processors and intel processors, Differentiate ...

Differentiate between Motorola processors and INTEL processors. Comparison between Motorola processors and INTEL processors: AMD/Intel processors are actually about similar t

Determine total magnetic flux, Determine Total magnetic flux: A ring i...

Determine Total magnetic flux: A ring is composed of three sections. The cross-sectional area is 0.001 m2 for each section. The mean lengths of each section are l a = 0.3 m,

Explain in detail the operation of 8255 in mode 1, Explain in detail the op...

Explain in detail the operation of 8255 in mode1 taking suitable example. In mode1, Ports A and B are programmed as input or output ports and Port C is used for handshaking.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd