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Many devices in the computing world use an AC adapter rather than an internal power supply Even though it sits outside a device, an AC adapter converts AC current to DC, just like a power supply Unlike power supplies, AC adapters are rarely interchangeable Although manufacturers of different devices often use the same kind of plug on the end of the AC adapter cable, these adapters are not necessarily compatible In other words, just because you can plug an AC adapter from your friend s laptop into your laptop does not mean it s going to work! You need to make sure that three things match before you plug an AC adapter into a device: voltage, amperage, and polarity If the voltage or amperage output is too low, the device won t run If the polarity is reversed, it won t work, just like putting a battery in a flashlight backwards If the voltage or amperage especially the latter is too high, on the other hand, you can very quickly toast your device Don t do it! Always check the voltage, amperage, and polarity of a replacement AC adapter before you plug it into a device
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Using a Multimeter to Test AC Outlets
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Every competent technician knows how to use a multimeter, so if you haven t used one in the past, get hold of one and Try This! First, you need to set up the meter for measuring AC Follow these steps: 1 2 3 Place the black lead in the common ( ) hole If the black lead is permanently attached, ignore this step Place the red lead in the V-Ohm-A (+) hole If the red lead is permanently attached, ignore this step Move the selector switch to the AC V (usually red) If multiple settings are available, put it into the first scale higher than 120 V (usually 200 V) Auto-range meters set their own range; they don t need any selection except AC V
Once you have the meter set up for AC, go through the process of testing the various wires on an AC socket Just don t put your fingers on the metal parts of the leads when you stick them into the socket! Follow these steps: 1 2 3 Put either lead in hot, the other in neutral You should read 110 to 120 V AC Put either lead in hot, the other in ground You should read 110 to 120 V AC Put either lead in neutral, the other in ground You should read 0 V AC
If any of these readings is different from what is described here, it s time to call an electrician
8: Power Supplies
the resistance tester A broken wire or fuse will show infinite resistance, while a good wire or fuse will show no resistance Testing AC and DC voltages is a matter of making sure the measured voltage is what it should be
Using Special Equipment to Test AC Voltage
A number of good AC-only testing devices are available With these devices, you can test all voltages for an AC outlet by simply inserting them into the outlet Be sure to test all the outlets the computer system uses: power supply, external devices, and monitor Although convenient, these devices aren t as accurate as a multimeter My favorite tester is made by Radio Shack, catalog number 22-141 (see Figure 87) This handy device provides three light-emitting diodes (LEDs) that describe everything that can go wrong with a plug If all power companies could supply electricity in smooth, continuous flows with no dips or spikes in pressure, the next two sections of this chapter would be irrelevant Unfortunately, no matter how clean the AC supply appears to be to a multimeter, the truth is that voltage from the power company tends to drop well below (sag) and shoot far above (surge or spike) the standard 115 V (in the US) These sags and spikes usually don t affect lamps and refrigerators, but they can keep your PC from running or can even destroy a PC or peripheral device Two essential devices handle spikes and sags in the supply of AC: surge suppressors and uninterruptible power supplies
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