Lab 1: Using a Multimeter

 

Objective: The objective of this lab is to familiarize ones self with the tools of a circuit analysis laboratory, namely the use of a Digital Multimeter.

 

 

Procedures

1. Resistance Test
2. Voltage Test on DC Power Supply
3. Measuring Voltage Across an LED

Resistance Test: Measure resistance for various resistors, (note colour bands).

Resistor Colours        Value from Colours     Measured Values 

                   Brn, Grn, Brn, Gld        150 Ohms  %5 tol         149.0 Ohms
                   Orng, Blk, Blk, Gld        30 Ohms   %5 tol         30.0 Ohms
                   Orng, Blk, Blk, Gld        30 Ohms   %5 tol         30.2 Ohms
                   Ylw, Prpl, Ylw, Gld       470kOhms %5 tol         .475MOhms

Voltage Test: Measure the Voltage on 9V DC Power Supply/Measure Voltage Drop across 150Ohm Resister.

Value: 9.03V

Voltage Drop across 150Ohm Resister

Measuring Voltage Across LED: Construct circuit from figure in Lab Manual (see picture below), and measure the voltage across Green LED in series with a 150Ohm Resistor and a 5V Power Supply. (actual voltage supply as measured was 4.5Volts)

Values:
Voltage Supply: 4.5 Volts
150 Ohm Resister: 2.42 Volts
Grn LED: 2.11Volts.

Voltage drop across the entire circuit as a Sum:

-4.5V + 2.42V + 2.11V = 0