Hardware Reference
In-Depth Information
Figure 20.7. A typical logic probe.
Logic probes are especially useful for troubleshooting a dead system. By using the probe, you can
determine whether the basic clock circuitry is operating and whether other signals necessary for
system operation are present. In some cases, a probe can help you cross-check the signals at each pin
on an integrated circuit chip. You can compare the signals present at each pin with the signals a
known-good chip of the same type would show—a comparison that is helpful in isolating a failed
component. Logic probes also can be useful for troubleshooting some disk drive problems by
enabling you to test the signals present on the interface cable or drive-logic board.
Outlet (Receptacle) Testers
Outlet testers (also called
receptacle testers
) are useful test tools. These simple, inexpensive
devices, sold in hardware stores, test electrical outlets. You simply plug in the device, and three
20.8
).
