LAB 4 - Power (3)

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Centennial College *

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101

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Electrical Engineering

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Dec 6, 2023

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PC Hardware LAB 4 - Power Student name: Station ID: ============================================================= Instructions: Use pen and write your Full name and student ID on all pages. All labs have to be done during lab time, in the lab room. Each lab has to be checked by the professor progressively during lab time. You must call your professor to check your work and sign it whenever you reach the point asking for the professor’s initials or signature. ============================================================= Objectives: After completing this lab, you will demonstrate the ability to:  Identify the form factor of the case, motherboard and power supply  Use Multimeter  Do Continuity check  Check a LAN Cable  Check a power supply fuse  Check ATX form factor motherboard’s DC voltages Suggested Readings : Textbook Chapter 4 Parts Needed:  Multimeter  Fuses  Wires  LAN cable  ATX-style systems Activity : The form factor is a set of specifications about the size, shape, and configuration of the components that make up the system. Lab 4.1 Identify Form Factors 1. Use a favourite Internet search engine, search for ATX power supplies. a) How many pins are there on the main ATX power supply connector has? b) How do we call this connector? Page 1 of 9

PC Hardware LAB 4 - Power Student name: Station ID: c) Is there any difference between ATX and ITX power supplies? Lab 4.2 Multimeter A multimeter is an electrical / electronic device that performs continuity tests and measures resistance, amperage, and voltage. Multimeters have analog or digital output display and have two leads (probes) used to contact the component you are testing. Continuity check 1. Obtain two pieces of wire and strip the ends. Ten to fifteen centimeters long is enough. 2. Lay the cable horizontally in front of you. Refer the left side as Connector A and the right side as Connector B. 3. Set your multimeter to measure resistance (Ohms). 4. Turn the multimeter on. 5. Place the red probe on connector A and the black probe on connector B. 6. What is the reading on your multimeter, and what does this mean regarding the continuity of the test cable? 7. Keep the probes connected as above and cut the wire in middle. Alternatively, use two pieces of wire, which is the same as having one piece cut in two. 8. What is now the reading of your meter, and what does it mean regarding the continuity of the wire? Lab 4.3 LAN Cable check 1. Obtain a piece of LAN cable. Ten to fifteen centimeters long is enough. 2. Strip the ends of the wires and lay the cable horizontally in front of you. Page 2 of 9

PC Hardware LAB 4 - Power Student name: Station ID: 3. Set your multimeter to measure resistance 4. Turn on the multimeter 5. Check the continuity of each wire. Place the red probe on the green and white wire , keep the red probe connected to it and connect the black probe to every other wire at the other end in the following order and state the measured resistance below: a. Brown - Resistance: Ω b. Brown and white - Resistance: Ω c. Orange - Resistance: Ω d. Orange and white - Resistance: Ω e. Blue - Resistance: Ω f. Blue and white - Resistance: Ω g. Green - Resistance: Ω h. Green and white - Resistance: Ω i. 6. Using the table below, draw a line from the left-side wire to any wire on the right side that shows zero- ohm resistance. Left-Side Wire Right-Side Wire Brown Brown Brown and white Brown and white Orange Orange Orange and white Orange and white Blue Blue Blue and white Blue and white Green Green Green and white Green and white 7. What is the resistance reading between the left side brown and right side green? If you suspect a cable is not working, what test would you perform? What do you expect the meter reading to be if there is some discontinuity along the wire? Professor’s initials: Lab 4.4 Fuse check Many times the power supply is not functioning simply because its fuse is blown. Although opening and the power supply and touching the wrong components may be extremely dangerous, changing the fuse will cost much less than replacing the power supply. It is strongly suggested though NOT to open the power supply unless you really Page 3 of 9

PC Hardware LAB 4 - Power Student name: Station ID: know what you are doing. 1. Obtain two fuses from your professor, one good and one blown (the wire inside the fuse is broken). Return them when you finished with this procedure. 2. On the fuse there must be some indication of its current and voltage ratings. What is the current rating on either one of the fuses? 3. Set your multimeter to read resistance (Ω) or continuity (with the diode symbol). 4. Power on the multimeter. 5. Connect the red probe of the multimeter to one end and the black to the opposite end of the good fuse. 6. What is the resistance of the fuse in Ω? 7. What reading did you anticipate if the fuse were not good? 8. What is the actual resistance measurement? Lab 4.5 . ATX-style motherboard DC voltage check 1. Power off the Antec computer and remove its cover. 2. What is the form factor of the motherboard and power supply? 3. Power on the computer. 4. Set the multimeter to read DC Voltage and set its calibration to read max. 20V 5. Turn on the multimeter. 6. With the computer on, and the power connectors attached on the motherboard, place the multimeter’s black probe to any one of the power supply’s black lead , and keep it there. Use a piece of stripped wire if the probe does not fit. 7. Place the red probe of your multimeter to each one of the other leads of the power supply and fill in the table below with your measurements. Page 4 of 9

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