На сортировку / 2102172 / Delenie_napryazhenie

MINISTRY OF EDUCATION AND SCIENCE OF THE REPUBLIC OF KAZAKHSTAN

ALMATY UNIVERSITY OF POWER ENGINEERING AND TELECOMMUNICATION

Department of Electronics

Discipline: Measurement of electrical quantities

Laboratory work №4

Theme: Current and voltage dividers.

Performed by: student of group EPEe-15-11 Muhtarov A.N.

Checked by: assistant Mussina A.B.

Almaty,2016

Voltage and Current dividers

Voltage divider

Objective:

To view the principle of the voltage divider and current. Calculate voltage values ​​using a rule of division of voltage and current and to confirm the rule (principle) by dividing the voltage measurements. Find and eliminate damage to current and voltage dividers.

Equipment:

• PU-2000 CPU;

• PCB U-101;

• Multimeter.

Introduction

The voltage divider is a resistance network, which is used to reduce the input voltage to a lower value. The formula for calculating the output voltage is

V_out=(resistance which is measured by output / total resistance of the circuit) * U_in

The order of performance:

A voltage divider

1. Insert the circuit board in U-101 CPU PU-2000.

2. Set both the power supply voltage of 0 volts. Connect the resistors R₇ and R₈ as a voltage divider as shown in Figure 1.

3. Measure the value of resistance R₇ and R₈.

4. Install the power supply PS-1 to 7.5V voltage. Use meter for measuring the voltage from the power source and the voltage across the resistor R₈. Record the two readings.

U_in =

U_R8 =

5. Using the formula to calculate the theoretical voltage divider output voltage using the output resistance R₈ and R₇ + R₈ for total resistance.

Rated output voltage =

6. Re-attach the power source voltage is 0V and tear chain.

7. Collect the circuit, as shown in Figure 2, forming a voltage divider comprising four resistors.

8. Measure the value of resistance R₅ and R₆.

9. Adjust the power supply PS-1 to the value 8B, measure and record the output voltage of the voltage divider on the R₈.

U_in =

U_R8 =

10. Calculate the output value of the voltage divider, the voltage divider by using the formula

Rated output voltage =

11. Install the power supply voltage is 0V and open circuit.

Current divider

Current divider is a resistance network that reduces the input current to a lower value. The formula for calculating the output value is:

 

12. Replace the power supply voltage of 0V and connect the power divider network comprising resistors 3 shown in the figure. Install the power supply PS-1 for voltage 10V.

13. Calculate conductivity of R₁, R₂ and R₃. Then add them to obtain an overall conductivity of the network:

G₁ =

G₂ =

G₃ =

G_all = G₁ + G₂ + G₃ ...

14. Measure and record the input current I_in =

15. Using the formula to calculate the output current in R₁, R₂ and R₃:

 

16. Confirm the calculations by measuring the currents in all three resistances, reinstall the power supply PS-1 to the 0V voltage and open circuit.