vb.net barcode reader FIGURE 3.3 The logic probe in use. The probe derives its power from the circuit under test. in Software

Generation Data Matrix ECC200 in Software FIGURE 3.3 The logic probe in use. The probe derives its power from the circuit under test.

FIGURE 3.3 The logic probe in use. The probe derives its power from the circuit under test.
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LOGIC PULSER 33
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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. 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. Most probes are not battery operated; rather, they obtain operating voltage from the circuit under test. You can also make a logic probe on your own if you wish. A number of project books provide plans.
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USING A LOGIC PROBE
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The same safety precautions for using a meter apply when you are using a logic probe. Be cautious when working close to high voltages. Cover them to prevent accidental shock (for obvious reasons, logic probes are not meant for anything but digital circuits, so never apply the leads of the probe to an AC line). Logic probes cannot operate with voltages exceeding about 15 volts DC, so if you are unsure of the voltage level of a particular circuit test it with a meter first. 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.
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A handy troubleshooting accessory to have when you are working with digital circuits is the logic pulser. This device puts out a timed pulse, making it possible for you to see the effect of the pulse on a digital circuit. Normally, you d use the pulser with a logic probe or an oscilloscope (discussed in the next section). The pulser can be switched between one pulse and continuous pulsing. Most pulsers obtain their power from the circuit under test. It s important that you remember this. With digital circuits, it s generally a bad idea to present an input signal to a device when it s greater than the supply voltage for that device. In other words, if a chip is powered by 5 volts, and you give it a 12-volt pulse, you ll probably ruin the chip. Some circuits work with split ( , , and ground) power supplies (especially circuits with op amps), so be sure you connect the leads of the pulser to the correct power points. Also be sure that you do not pulse a line that has an output but no input. Some integrated circuits are sensitive to unloaded pulses at their output stages, and if the pulse is applied inappropriately it can destroy the chip.
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An oscilloscope is a pricey tool good ones start at about $350. For really serious work, however, an oscilloscope is an invaluable tool that will save you hours of time and frustration. Other test equipment will do some of the things you can do with a scope, but oscilloscopes do it all in one box and generally with greater precision. Among the many applications of an oscilloscope, you can do the following:
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