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Oscilloscopes are electronic measuring instruments that display electrical signals at a certain time. They are commonly used in the field of electronics to test components and circuit designs. The main electrical quantity that an oscilloscope measures is voltage, but they can also be used to detect and measure a variety of other signals, including frequency, amplitude, and time-based characteristics. They can also be used to measure other phenomena that change over time, such as the strength of sound, vibrations, and electrical activity in nerves. Today, the standard oscilloscope for industrial applications is the digital storage oscilloscope (DSO), which uses digital memory to store sample data.
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What You'll Learn
Voltage
An oscilloscope is a device that measures voltage waves. It does this by displaying electrical signals as a graph that changes over time, with voltage displayed on the vertical y-axis and time on the horizontal x-axis. The graph can be adjusted using controls surrounding the scope's screen, allowing the user to zoom in and out on the signal. The primary function of an oscilloscope is to measure voltage, but it can also detect and measure a variety of other signals.
Oscilloscopes are commonly used by engineers to perform waveform and signal analysis in electronic circuits. They can be used to test and debug circuit designs, as well as to analyse signal frequency and phase. By connecting probes to different points in a circuit, oscilloscopes can display and measure voltage waveforms. This allows engineers to optimise the performance of their circuits and ensure they are functioning correctly.
Oscilloscopes can be used to measure both direct current (DC) and alternating current (AC) voltage signals. To measure a DC signal, the oscilloscope is first turned on without connecting the input signal. The oscilloscope line is then placed over the zero-volt level using the vertical position setting. The DC signal path is plugged into one of the oscilloscope's inputs, and the number of vertical divisions that the line shifts is counted and multiplied by the volts per division to find the DC signal voltage.
To measure an AC signal, the AC signal is plugged into one of the oscilloscope's inputs and optimised. The signal's amplitude is measured by counting the number of vertical divisions between the highest and lowest points of the signal (the peak and trough). The amplitude in volts is then calculated by multiplying the number of vertical divisions by the volts per division setting.
Oscilloscopes have a maximum input voltage and a resolution that represents how precisely they can measure the input voltage. The vertical sensitivity of an oscilloscope represents the minimum and maximum values of the vertical voltage scale. It is important to understand the requirements of a project and the type of oscilloscope needed to get the most efficient and accurate measurements.
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Frequency
Oscilloscopes are electronic instruments used by engineers to analyse electrical signals, waveforms, and frequencies. They are an important tool in any electrical engineer's lab, allowing them to visualise and analyse electrical signals as they change over time.
Oscilloscopes are commonly used to measure waveforms with defined frequencies. They can be used to determine the frequency with which a particular portion of the signal occurs relative to other portions. This helps engineers understand the characteristics of the electrical signal and optimise the performance of their circuits.
Additionally, oscilloscopes can use the ""marker" feature to measure the time taken for a signal to move between two points. By taking the inverse (1/t), the frequency can be determined. Another method involves taking two measurements from different positions on a single rising or falling edge and using the formula: Frequency = (1 / Time difference) × 2π radians per cycle.
Oscilloscopes have limitations in terms of the speed at which they can detect signal changes, and their performance may degrade beyond certain frequencies.
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Bandwidth
The oscilloscope's front-end amplifier has a frequency response resembling a low-pass filter, allowing most signal content from DC to pass where the attenuation drops by 3 decibels (dB). This is an important consideration when selecting an oscilloscope, as insufficient bandwidth can lead to incorrect measurements and misinterpretations. For example, radio frequency (RF) and microwave applications typically require high-bandwidth oscilloscopes with frequency ranges in the gigahertz (GHz) region.
The relationship between rise time and bandwidth is crucial when choosing an oscilloscope. The formula for estimating the minimum required bandwidth for a specific rise time is: Minimum Bandwidth (in Hertz) ≈ 0.35 / Fastest Rise Time (in seconds). This relationship ensures that the oscilloscope can provide accurate measurements and handle the signals intended for analysis.
Additionally, it is important to consider the type of signals being measured. For sine waves, slightly more bandwidth than the maximum carrier frequency is needed to account for attenuation. For more complex waveforms, such as digital signals, it is recommended to choose a bandwidth that is 3-5 times faster than the fastest clock or data signal.
Most oscilloscopes offer upgradeable bandwidth options, but it is important to note that too much bandwidth can introduce more broadband noise into the measurements. Filters can be used to reduce the front end's bandwidth and improve accuracy, especially for low-bandwidth measurements.
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Maximum input voltage
Every electronic device has a limit when exposed to high voltage. Similarly, oscilloscopes have a maximum input voltage rate. If the voltage of the input signal surpasses the specified limit, the device may be damaged. The maximum input voltage varies depending on the oscilloscope model and its specifications.
The earliest oscilloscopes used a cathode-ray tube (CRT) as their display element. These early models provided valuable insights into high-speed voltage changes but were limited in their frequency response. Modern oscilloscopes, on the other hand, are available in both analog and digital variants. Analog oscilloscopes use an electron beam to directly map the input voltage to a display, while digital oscilloscopes employ microcontrollers to sample the input signal and then map it to the display.
Digital oscilloscopes have become the standard type used in industrial applications and even by hobbyists due to their low cost of entry. They utilise an analog-to-digital converter (ADC) to convert measured voltages into digital information. This allows for the storage of sample data for as long as required without degradation, offering a significant advantage over analog storage scopes.
The maximum input voltage for an oscilloscope can vary depending on various factors, including the type of probes used. 10x probes, for example, are commonly used and can measure voltages up to common mains voltages when used with appropriate voltage ratings. However, it is important to prioritise safety and not exceed the recommended voltage limits, as doing so may damage the device or pose a safety risk.
It is worth noting that the resolution of an oscilloscope represents its precision in measuring the input voltage. This resolution can be adjusted by changing the vertical scale, which defines the minimum and maximum values of the vertical voltage scale in volts per division. Additionally, the time base of the oscilloscope indicates the range of sensitivities on the horizontal time axis, measured in seconds per division.
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Resolution
The resolution of an oscilloscope refers to the precision with which it can measure input voltage. This value is variable, depending on the adjustments made to the vertical scale. The vertical sensitivity of the oscilloscope represents the minimum and maximum values of the vertical voltage scale, listed in volts per division.
Oscilloscopes are electronic measuring instruments that graphically display electrical signals and their changes over time. They are commonly used in electronics to test components and circuit designs. The primary function of an oscilloscope is to measure voltage waves, which are displayed on a two-dimensional graph with time on the x-axis and voltage on the y-axis. The electron beam of the oscilloscope is swept across a phosphorescent screen in the x-direction at a known rate, while an input signal controls the position of the beam in the y-direction, allowing the voltage to be measured.
The resolution of an oscilloscope is an important factor in determining its accuracy and suitability for a particular project. It is one of several specifications that should be considered when choosing an oscilloscope, including bandwidth, rise time, sample rate, channel density, and compatible probes.
Oscilloscopes can be classified as analog or digital. Analog oscilloscopes use an electron beam to directly map the input voltage to a display, while digital oscilloscopes use microcontrollers to sample the input signal and convert it into a digital display. Digital oscilloscopes tend to be easier to use, with features such as digital storage, decoding capabilities, and sharper LED displays. They also have a wider range of inputs, including USB, LAN, GPIB, Ethernet, serial port, and Wi-Fi. However, analog oscilloscopes may offer faster response times and are often preferred for certain applications.
In addition to voltage, oscilloscopes can also measure a variety of other electrical quantities, including frequency, amplitude, and other waveform characteristics. They can also be used to measure non-electrical phenomena that change over time, such as sound strength, vibrations, and electrical activity in nerves.
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Frequently asked questions
An oscilloscope measures voltage.
Analog oscilloscopes use an electron beam to map the input voltage to a display. Digital oscilloscopes use microcontrollers to sample the input signal and map the reading to the display.
An oscilloscope can measure frequency and period, amplitude, and other waveform characteristics.
