Rosewill Computer Case 422 Technical Information PDF herunterladen (Seite 93)

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Chapter 4 • Disassembly and Power

Lab 4.8 Wall Outlet and Power Cord AC Voltage Check

Objective: To check the voltage from a wall outlet and through a power cord

Parts: Multimeter

Computer power cord

Caution: Exercise extreme caution when working with AC voltages!

Procedure: Complete the following procedure and perform the accompanying activities.

1. Set the multimeter to AC VOLTAGE (refer to the meter’s manual if you are unsure about

this setting). Important: Using a current or resistance setting could destroy the meter.

2. Power on the multimeter. Locate an AC power outlet. Refer to Figure 4.38 for the power

connections.

HotNeutral

Ground

Figure 4.38 AC outlet

3. Insert the meter’s black lead into the round (Ground) AC outlet plug.

4. Insert the meter’s red lead into the smaller flat (Hot) AC outlet plug. The meter reading

should be around 120 volts. Use Table 4.9 to record the reading.

5. Move the meter’s red lead into the larger flat (Neutral) AC outlet plug. The meter reading

should be 0 volts. Use Table 4.9 to record the reading.

Table 4.9 Wall outlet AC checks

Connections Expected voltage Actual voltage

GND to hot 120VAC

GND to neutral 0VAC

Hot to neutral 120VAC

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 149 150

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Rosewill Computer Case 422 Technical Information Seite 93