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

Explain memory mapped i/o scheme, Explain Memory Mapped I/O Scheme. Me...

Explain Memory Mapped I/O Scheme. Memory Mapped I/O Scheme: In such scheme there is only one address space. These address space is defined as all possible addresses which m

Cro, Ask question #Minimum 100 words accepteddelay line in cro#

Ask question #Minimum 100 words accepteddelay line in cro#

Electronics, determine mimimum SOP for the following swiching funcion using...

determine mimimum SOP for the following swiching funcion using K-map: F(x1,x2,x3,x4)=Summationof m(4,6,8,10,11,12,15)+DC(3,5,7,9)

Instruction size , Instruction size As we  have seen already  that eac...

Instruction size As we  have seen already  that each instruction has two parts Opcode ( Operation  Code) Which  tells  the types  of operation  to be  performed .

What is converse-hull property of bezier curve, Describe Bezier Curve ? Wha...

Describe Bezier Curve ? What is Converse-Hull Property of Bezier Curve?

Determine which is the sinusoidal expression for the current, 1. The voltag...

1. The voltage across a 1 - μF capacitor is given. Which is the sinusoidal expression for the current? a) 30 sin200t b) 70cos (800t - 20°) 2. At what frequency will the re

Voltage, the relation between power

the relation between power

Name the special functions registers available in 8051, Name the special fu...

Name the special functions registers available in 8051. Accumulator B Register Program Status Word. Stack Pointer. Data Pointer. Port 0 Port 1 Port 2 Po

3rd year electrical/electronics project, I`m a 3rd year electrical engineer...

I`m a 3rd year electrical engineering student studying in Canada, and there is a new course they added in my university for 3rd year students called Engineering Project. from the

Describe the process control instructions, Describe the process control ins...

Describe the process control instructions STC - It sets the carry flag & does not affect any other flag  CLC - it resets the carry flag to zero &does not affect any other fl

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