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Why don’t all circuits like logic probes?
Believe it or not, some electronic circuits don’t like certain pieces of test equipment. Most test gear, including the multimeter and oscilloscope, draws very little current from the circuit that you’re testing. Their makers design these testing tools this way so that the tools themselves don’t influence the reading. Obviously, it does no good to test a circuit if the testing tool changes the behavior of that circuit. You can’t get a reliable result. Logic probes not only draw power from the circuit, they can load down the signal line that you’re testing. Some digital signals are fairly weak. The additional load of the logic probe may cause the signal to drop in voltage to a point where you can’t get an accurate reading. Although this situation doesn’t come up all that often, it’s a good example of why you need to be somewhat familiar with the circuit that you’re testing. Just know that poking the probe into unknown territory may yield unpredictable results. Be sure to read the manual or instruction booklet that comes with your logic probe for additional pointers, cautions, caveats, warnings, and operating tips. Though many logic probes are similar in design, slight differences can influence the types of circuits that a particular probe best works with. Observe the usual safety precautions The same safety precautions that you use with a multimeter apply when you use a logic probe, only more so. Safety is even more important with a logic probe than with a multimeter because the logic probe is an active-circuit tester. You have to turn the circuit on in order to test it. This requirement is not always true of the multimeter,
with which you can conduct certain tests, such as continuity (testing whether a circuit is complete), without applying any power to the circuit. |
Simple logic probe
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This intel was contributed by Puniksem
Puniksem
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May, 2012
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