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Test DC or AC voltage levels Analyze the waveforms of digital and analog circuits Determine the operating frequency of digital, analog, and RF circuits Test logic levels Visually check the timing of a circuit to see if things are happening in the correct order and at the prescribed time intervals
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The designs provided in this book don t absolutely require that you use an oscilloscope, but you ll probably want one if you design your own circuits or want to develop your electronic skills. A basic, no-nonsense model is enough, but don t settle for the cheap, single-trace units. A dual-trace (two-channel) scope with a 20- to 25-MHz maximum input frequency should do the job nicely. The two channels let you monitor two lines at once, so you can easily compare the input and output signals at the same time. You do not need a scope with storage or delayed sweep, although if your model has these features you re sure to find a use for them sooner or later. Scopes are not particularly easy to use; they have lots of dials and controls for setting operation. Thoroughly familiarize yourself with the operation of your oscilloscope before using it for any construction project or for troubleshooting. Knowing how to set the timeper-division knob is as important as knowing how to turn the scope on. As usual, exercise caution when using the scope with or near high voltages.
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OF OSCILLOSCOPE BANDWIDTH AND RESOLUTION
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One of the most important specifications of an oscilloscope is its bandwidth. If 20 MHz is too low for your application, you should invest in a more expensive oscilloscope with a bandwidth of 35, 60, or even 100 MHz. Prices go up considerably as the bandwidth increases. The resolution of the scope reveals its sensitivity and accuracy. On an oscilloscope, the X (horizontal) axis displays time, and the Y (vertical) axis displays voltage. The sweep time indicates the X-axis resolution, which is generally 0.5 microseconds or faster. The sweep time is adjustable so you can test signal events that occur over a longer time period, usually as long as a half a second to a second. Note that signal events faster than 0.5 microseconds can be displayed on the screen, but the signal may appear as a fleeting glitch or voltage spike. The sensitivity indicates the Y-axis resolution. The low-voltage sensitivity of most average-priced scopes is about 5 mV to 5 volts. You turn a dial to set the sensitivity you want. When you set the dial to 5 mV, each tick mark on the face of the scope tube
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represents a difference of 5 mV Voltage levels lower than 5 mV may appear, but they can. not be accurately measured. Most scopes will show very low-level voltages (in the microvolt range) as a slight ripple.
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Over the years, oscilloscopes have improved dramatically, with many added features and capabilities. Among the most useful features are the following:
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I Delayed sweep. This is helpful when you are analyzing a small portion of a long, complex signal.
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I Digital storage. This feature records signals in computerized memory for later recall.
Once signals are in the memory you can expand and analyze specific portions of them. Digital storage also lets you compare signals, even if you take the measurements at different times. I Selectable triggering. This feature lets you choose how the scope will trigger on the input signal. When checking DC signals, no triggering is necessary, but for AC and digital signals you must select a specific part of the signal so the scope can properly display the waveform. At the very least, a scope will provide automatic triggering, which will lock onto most stable AC and digital signals.
USE GOOD SCOPE PROBES
The probes used with oscilloscopes are not just wires with clips on the end of them. To be effective, the better scope probes use low-capacitance/low-resistance shielded wire and a capacitive-compensated tip. These ensure better accuracy. Most scope probes are passive, meaning they employ a simple circuit of capacitors and resistors to compensate for the effects of capacitive and resistive loading. Many passive probes can be switched between 1X and 10X. At the 1X setting, the probe passes the signal without attenuation (weakening). At the 10X setting, the probe reduces the signal strength by 10 times. This allows you to test a signal that might otherwise overload the scope s circuits. Active probes use operational amplifiers or other powered circuitry to correct for the effects of capacitive and resistive loading as well as to vary the attenuation of the signal. Table 3.1 shows the typical specifications of passive and active oscilloscope probes.
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