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6.4 ELECTRONIC TOOLS
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6.4.3 LOGIC PROBES
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Meters are typically used for measuring analog signals. Logic probes test for the presence or absence of low-voltage digital data signals. The 0s and 1s are usually electrically defined as 0 and 5 V, respectively, when used with TTL integrated circuits (ICs). In practice, the actual voltages of the 0 and 1 bits depend entirely on the circuit and the parts used to make it up. You can use a meter to test a logic circuit, but the results aren t always predictable. Further, many logic circuits change states (pulse) quickly, and meters cannot track the voltage switches quickly enough. Logic probes, such as the model in Fig. 6-3, are designed to give a visual and (usually) audible signal of the logic state of a particular circuit line. One LED (light-emitting diode) on the probe lights up if the logic is 0 (or low); another LED lights up if the logic is 1 (or high). You should only work with a probe that has a built-in buzzer with different tones for the two logic levels. This feature will allow you to look at the circuitry you are probing rather than having to glance at the probe to see the logic level. A third LED or tone may indicate a pulsing signal. A good logic probe can detect that a circuit line is pulsing at speeds of up to 10 MHz, which is more than fast enough for robotic applications, even when using computer control. The minimum detectable pulse width (the time the pulse remains at one level) is 50 nanoseconds, which again is more than sufficient. Another feature that you should be aware of is the ability of the probe to work with different logic families and logic voltage levels. Different CMOS logic families can work at
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FIGURE 6-3 The logic probe in use. Note that in the photograph the probe derives its power from the circuit under test.
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power supply voltages ranging from 3 to 15 V with a logic level transition voltage of onehalf the power supply voltage (1.5 to 7.5 V). TTL logic s transition voltage is usually regarded as 1.4 V and is independent of the input power supply (which ranges from 4.75 to 5.25 V). The logic technology that the probe works with is switch selectable. Most probes are not battery operated; rather, they obtain operating voltage from the circuit under test. This feature allows you to start simply probing your circuit without providing a separate power supply (with a matching ground to the test circuit) for the logic probe and determining the appropriate CMOS logic test level. Although logic probes may sound complex, they are really simple devices, and their cost reflects this. You can buy a reasonably good logic probe for under $20. The logic probe available from Radio Shack, which has most of the features listed here, can be purchased at this price point. You can also make a logic probe if you wish; it is not recommended as you will be hard pressed for buying the necessary parts for less than the cost of an inexpensive unit. To use the logic probe successfully you really must have a circuit schematic to refer to. Keep it handy when troubleshooting your projects. It s nearly impossible to blindly use the logic probe on a circuit without knowing what you are testing. And since the probe receives its power from the circuit under test, you need to know where to pick off suitable power. To use the probe, connect the probe s power leads to a voltage source on the board, clip the black ground wire to circuit ground, and touch the tip of the probe against a pin on an integrated circuit or the lead of some other component. For more information on using your probe, consult the manufacturer s instruction sheet. When designing your robot, it is a good idea to keep your digital logic separate from power supplies and other high-voltage/high-current circuits. When working on an awkward circuit, such as one mounted in a robot, it is not unusual for the metal probe tip to slip and short out other circuits. If the board is all digital logic, then this isn t a problem but if there are other circuits on the board, you could end up damaging them, your logic probe, and any number of miscellaneous circuits.
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