vb.net barcode reader VOLT-OHM METER in Software

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VOLT-OHM METER
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Digital volt-ohm meters vary greatly in the number and type of functions they provide. At the very least, all standard meters let you measure AC volts, DC volts, milliamps, and ohms. Some also test capacitance and opens or shorts in discrete components like diodes and transistors. These additional functions are not absolutely necessary for building general-purpose robot circuits, but they are handy to have when troubleshooting a circuit that refuses to work. The maximum ratings of the meter when measuring volts, milliamps, and resistance also vary. For most applications, the following maximum ratings are more than adequate:
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DC volts AC volts DC current Resistance 1000 volts 500 volts 200 milliamps 2 megohms
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One exception to this is when you are testing current draw for the entire robot versus just for motors. Many DC motors draw in excess of 200 milliamps, and the entire robot is likely to draw 2 or more amps. Obviously, this is far out of the range of most digital meters. You need to get a good assessment of current draw to anticipate the type and capacity of batteries, but to do so you ll need either a meter with a higher DC current rating (digital or analog) or a special-purpose AC/DC current meter. You can also use a resistor in series with the motor and apply Ohm s law to calculate the current draw. The technique is detailed in 17, Choosing the Right Motor for the Job.
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Volt-ohm meters come with a pair of test leads, one black and one red. Each is equipped with a needlelike metal probe. The quality of the test leads is usually minimal, so you may want to purchase a better set. The coiled kind are handy; they stretch out to several feet yet recoil to a manageable length when not in use. Standard leads are fine for most routine testing, but some measurements may require that you use a clip lead. These attach to the end of the regular test leads and have a springloaded clip on the end. You can clip the lead in place so your hands are free to do other things. The clips are insulated to prevent short circuits.
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Most applications of the volt-ohm meter involve testing low voltages and resistance, both of which are relatively harmless to humans. Sometimes, however, you may need to test high voltages like the input to a power supply and careless use of the meter can cause serious bodily harm. Even when you re not actively testing a high-voltage circuit, dangerous currents can still be exposed. The proper procedure for using meters is to set it beside the unit under test, making sure it is close enough so the leads reach the circuit. Plug in the leads, and test the meter operation by first selecting the resistance function setting (use the smallest scale if the meter is not auto-ranging). Touch the leads together: the meter should read 0 ohms. If the meter
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does not respond, check the leads and internal battery and try again. If the display does not read 0 ohms, double-check the range and function settings, and adjust the meter to read 0 ohms (not all digital meters have a 0 adjust, but most analog meters do). Once the meter has checked out, select the desired function and range and apply the leads to the circuit under test. Usually, the black lead will be connected to ground, and the red lead will be connected to the various test points in the circuit.
Logic Probe
Meters are typically used for measuring analog signals. Logic probes test for the presence or absence of low-voltage DC signals, which represent digital data. The 0s and 1s are usually electrically defined as 0 and 5 volts, respectively, with TTL integrated circuits (ICs). In practice, the actual voltages of the 0 and 1 bits depend entirely on the circuit. 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. 3.3, are designed to give a visual and (usually) aural 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). Most probes have a built-in buzzer that has a different tone for the two logic levels. This prevents you from having to keep glancing at the probe to see the logic level.
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