TOP-5. The best oscilloscope (usb, from aliexpress). Rating 2022!

How to choose an oscilloscope

When purchasing a device, you should pay attention to its bandwidth. It should be slightly higher than the limiting frequency of the analog signals that will be measured. For example, if the maximum signal frequency is 90 MHz, then you need to choose an oscilloscope with a bandwidth of 120 MHz. At the same time, for stable operation with digital signals, the device must have a significantly larger bandwidth reserve. To work comfortably with such signals, it is better to buy a device with a logic analyzer function. It is also important to consider the cost of the device - the wider the bandwidth, the more expensive the oscilloscope.

Equally important is the number of main channels on which the purpose of the device depends. Modern devices are available with 2, 4 and 6 channels. Budget models for home use and repair have 2 or 4 channels, while professional laboratory devices have from 4 to 6. Some devices can be upgraded by installing additional channels using an activation code.

A good oscilloscope should be able to handle periodic signals, that is, be able to detect events that rarely occur. These include clock failure, interference, or power surges. This characteristic is referred to as “continuous waveform acquisition speed.” It is desirable that it be at least 5,000 per second.

The operating principle of an oscilloscope is similar to a multimeter. Devices differ in the way they display measurement data. The multimeter displays results only in numbers and is not capable of detecting transient or harmonic signals. In turn, the oscilloscope provides a significantly larger amount of data about the measured signals. For example, the screen displays the value of a wave in a specific time period, as well as its shape, amplitude and frequency. By analyzing this information, the owner of the device can promptly isolate signals that are harmful to the electronic system.

RIGOL DS1054Z

• Read also:  Homemade current (current) clamps on a Hall sensor, attachment to a multimeter

• Frequency band – 50 MHz.
• Sampling frequency – 1 GS/s.
• Automatic measurements – 22 parameters.
• Memory – 24,000,000 points.
• Display type – TFT, 7″
• Dimensions – 313x160x122 mm.
• Weight – 3200 g.

RIGOL DS1054Z is a new generation four-channel oscilloscope that is characterized by exceptionally accurate viewing of waveforms and measurements. The large color LCD display provides bright and clear measurements. Thanks to its great functionality, the model is suitable for any research laboratories, including facilities located at industrial facilities. The relative disadvantages of the device include its rather high cost.

After the first launch of the oscilloscope, the owner will receive a not entirely pleasant surprise - a notification about the expiration date of advanced functionality. At the end of the trial period, owners will have to purchase keys. Distinctive features include the way waveforms are displayed. Thanks to proprietary UltraVision technology, waveforms are displayed as on an analog device - the brightness of the signal changes depending on the intensity. It is also worth noting the large depth of memory and the number of functions that can satisfy any user needs.

① FNIRSI-1C15 digital pocket oscilloscope

Rating: 4.9 Price: from RUB 4,738.30
up to
RUB 4,890.36
Go to store The Fnirsi 1C15 compact oscilloscope is an excellent portable model with a frequency range of 110 MHz. The device is powered by a built-in 3000 mAh battery and has an automatic calibration function. To test the probes, the device uses a signal generator.

This device differs from the DSO150 model presented in the rating in its frequency range (DSO150 up to 200 MHz) and the absence of a built-in battery. The set includes a silicone case and a bag for carrying and storage.

Advantages:

• there is a separate digital signal processing on the FPGA;
• you can save pictures;
• portable, small size + runs on a 3000 mAh battery;
• good equipment;
• There is a folding holder.

Flaws:

• The digitization speed is stated as 500 Ms/s, but the real one is 200 Ms/s;
• The probes are of average quality - not bad, but if possible it is better to replace them.

Display

Buy on AliExpress.com

Typical applications and popular oscilloscope models

Now that we have dealt with the main selection criteria, let’s look at typical tasks for using oscilloscopes and the device models suitable for these tasks.

Basic oscilloscope for the laboratory

For most typical tasks that arise when developing or repairing electronic equipment, the Tektronix MSO/DPO2000B series (100 - 200 MHz, 2 or 4 channels, $1,000 - $4,000) is excellent, which was created as the main oscilloscope capable of solving 90% of problems in range up to 200 MHz:

Tektronix MSO/DPO2000 - Oscilloscopes with up to 200 MHz bandwidth

For more complex applications or for future purchase, choose the Tektronix MDO3 series (100 MHz - 1 GHz, 2 or 4 channels, $4,000 - $15,000), which supports a large number of expansion options, contains a built-in spectrum analyzer and allows expansion if necessary. bandwidth using activation code:

Tektronix MDO3 - Oscilloscopes (6 in 1) up to 1 GHz with spectrum analyzer up to 3 GHz

Development of multi-channel analog-digital devices

For complex systems containing many different analog and digital signals, choose the Tektronix MSO5 Series (350 MHz - 2 GHz, 4, 6 or 8 analog channels, up to 64 digital channels, starting at $15,000):

Tektronix MSO5 - Digital and Analog Oscilloscopes up to 2 GHz

or a series of professional USB oscilloscopes Pico Technology PicoScope 6000E (up to 500 MHz, up to 8 analog channels, up to 16 digital channels, from $5,000):

Pico Technology PicoScope 6000E - Eight-Channel Oscilloscopes with 500 MHz Bandwidth

For simpler analog-to-digital systems, as well as for power conversion and transmission systems, the Tektronix MSO4 series (200 MHz - 1.5 GHz, 4 or 6 analog channels, up to 48 digital channels, from $8,000) is well suited:

Tektronix MSO4 - Digital and Analog Oscilloscopes up to 1.5 GHz

For entry-level analog-to-digital systems, the optimal ones are: Pico Technology PicoScope 3000D USB series (50 - 200 MHz, 2 or 4 analog channels + 16 digital, $600 - $2,500) and the Tektronix MSO/DPO2000B desktop series, which was already mentioned in this comparison (100 - 200 MHz, 2 or 4 analog channels + 16 digital, $1,000 - $4,000):

Pico Technology PicoScope 3000D - USB oscilloscopes from 50 MHz to 200 MHz

Tektronix MSO/DPO2000 - Oscilloscopes with up to 200 MHz bandwidth

Professional oscilloscope for very complex tasks

When maximum analog and digital signal analysis capabilities up to 1 GHz and simultaneous RF signal analysis up to 6 GHz are important, choose the Tektronix MDO4000C Series (4 analog channels up to 1 GHz and 16 digital channels, spectrum analyzer up to 6 GHz, $8,000 - $20 000):

Tektronix MDO4000C - Oscilloscopes (6 in 1) up to 1 GHz with spectrum analyzer up to 6 GHz

In the frequency range of several gigahertz, the optimal series is the Tektronix MSO6 series, which combines advanced signal analysis capabilities with low-noise input paths and accurate digitization by 12-bit ADCs (4 analog channels up to 8 GHz, up to 32 digital channels, from $20,000):

Tektronix MSO6 - Precision Oscilloscopes up to 8 GHz

If the signal frequencies you need to work with are gigahertz and tens of gigahertz, then you need the Tektronix MSO/DPO70000 series (4 - 33 GHz, 4 channels, from $40,000):

Tektronix DPO70000C and MSO70000C - Ultra-Fast Oscilloscopes up to 33 GHz

Oscilloscope with isolated (independent) inputs for energy and high voltages

When working with high voltage (for example, power networks), as well as when working with galvanically isolated equipment components (optocouplers, transformers, electrically isolated sensors and signal acquisition systems), you need to use an oscilloscope in which each channel is independent and isolated from other channels and the network power supply of the oscilloscope itself. A special series is offered for this task: Tektronix TPS2000B (100 - 200 MHz, 2 or 4 channels, $4,000 - $6,000):

Tektronix TPS2000B - Oscilloscopes with isolated inputs and bandwidth up to 200 MHz

The cheapest possible oscilloscope, but high quality and functional

Three series are offered in the range up to $1,000:

1. Economy series in USB version: PicoScope 2000A and 2000B (10 - 100 MHz, 2 and 4 channels).

2. Economy series in a classic case: Tektronix TBS1000B (30 - 200 MHz, 2 channels). See prices in the USA here: TBS1000B prices. Prices in Ukraine are slightly higher than those indicated for the USA.

3. Series for educational institutions: Tektronix TBS1000B-EDU (50 - 200 MHz, 2 channels). See US prices here: TBS1000B-EDU prices. Prices in Ukraine are slightly higher than those indicated for the USA.

② DSO150 Handheld Digital Oscilloscope Kit

Rating: 4.9 Price: from RUB 1,777.34
up to
RUB 2,178.50
Go to the store Another pocket-sized, inexpensive model, the DSO150, is suitable for measuring frequencies in the range from 0 to 200 MHz. Used for both household and repair purposes with class A or AB low-frequency amplifiers. The device operates only from external power; there is no built-in battery. The DSO150 is equipped with two boards: analog and digital. The measurement results are displayed on a 2.4-inch display.

Advantages:

• has a good and readable display for its size and price;
• a good entry-level device, suitable for working with low-frequency signals;
• has a compact size;
• presence of a probe with a divider.

Flaws:

• there is no built-in battery, but there are many guides online on how to install it there or power it from the crown;
• The signal shape is shown normally up to 40-80 kHz, then it is difficult to distinguish.

Buy on AliExpress.com

Oscilloscope rating

When compiling the review, products from well-known brands were studied. The stability of operation, safety of operation, and technical characteristics of the oscilloscope were checked. The opinions of users and reviews of specialists from research laboratories were taken into account. The main attention was paid to the following parameters:

• Signal processing – available in analog and digital models;
• Type – produce stationary and portable devices;
• Functionality – additional information expands possibilities;
• Memory – increases research productivity;
• Rise time – affects frequency properties.

Unstable data, low discreteness, high error and noise - equipment with such defects was excluded from our rating.

③ Digital oscilloscope + multimeter KKMOON kkm828

Rating: 4.9 Price: from RUB 3,566.90
up to
RUB 7,857.43
Go to the store The portable digital oscilloscope-multimeter KKMOON kkm828 with a color screen is designed for measuring direct and alternating voltage AC/DC up to 750V and 1000V with a resistance of up to 40 MOhm. The device is suitable for diode testing and continuity testing. The case is made of durable plastic that can withstand shocks and falls. Bandwidth in oscilloscope mode is 1 MHz with a sampling rate of 2.5 MV per second.

Advantages:

• high-contrast color display;
• 2 in 1 portable device: oscilloscope and multimeter;
• good assembly: there is a stand, soft keys.

Flaws:

• there is no built-in battery, 3 batteries are used instead;
• There is no smooth adjustment of the voltage division, so the device is more suitable for beginners.

Buy on AliExpress.com

Brief Introduction

The digital oscilloscope market offers many series from different manufacturers, so choosing even such a device that is familiar to every engineer becomes a difficult task. At the same time, a careful comparison of the characteristics and capabilities of models from different manufacturers may not answer the question: which oscilloscope is best suited to solve my problems?
In this article, relying on our work experience, we will talk about simple criteria for choosing the optimal oscilloscope, consider typical applications and offer oscilloscope models for each typical task, by choosing which you can work effectively and save your money, time and nerves.

④ USB oscilloscope attachment Hantek 6022BE

Rating: 4.8 Price: from RUB 4,324.91
up to
RUB 4,959.13
Go to store The Hantek 6022BE portable oscilloscope is designed for use with laptop computers via a USB 2.0 connector. The aluminum body of the device protects the internal components from damage. Thanks to its rectangular shape, it can be positioned vertically or horizontally. The device saves the finished measurement results in text, jpg photo or MS Excel and Word file formats. The permissible range of the input signal without a divider is from -4.5 to +4.5 volts.

Advantages:

• two-channel;
• there is a lot of software for working with an oscilloscope - both official for Windows and unofficial for Windows and Android (via OTG)/Linux;
• small size;
• high-quality assembly and materials.

Flaws:

• narrow voltage measurement range.

Dipstick

Buy on AliExpress.com

Tips and tricks when choosing oscilloscopes from Aliexpress

To better navigate the huge assortment of AliExpress, you should clearly know what oscilloscopes there are and what their features are. Oscilloscope types:

Options for selecting a device from AliExpress

You should also consider:

• how many channels does the device have and what is their quality of operation. There are models where the average quality of channels is compensated by their quantity; they are more expensive. No matter how many channels there are, the main place is given to the uniformity of the frequency response, their protection from current surges, amplification accuracy and frequency range. Isolated channels are required if devices with galvanic isolation are to be tested. If you need an oscilloscope for home use, a model with 2-4 channels is suitable. If we are talking about debugging a system for parallel data export - 8-16 channels;
• bandwidth size. Even schoolchildren know that this characteristic of the purchased oscilloscope must exceed the maximum frequency of the band being studied. Just a few years ago, a threefold increase was considered sufficient. Modern standards recommend five times;
• trigger - edge, pulse width, video, tilt, overtime, window, pattern, interval, delay;
• waveform update rate;
• Are there additional programs and a set of functions for the fast Fourier transform?

The average cost of a standard amateur device with 2-4 channels is 15-20 thousand rubles. Professional - about 4 times higher.

Video - How to learn to use an oscilloscope

⑤ YEAPOOK ADS5012h (FNIRSI 5012H, DANIU ADS5012H) portable digital mini oscilloscope

Rating: 4.9 Price: from RUB 4,882.71
up to
RUB 5,424.47
Go to store as FNIRSI 5012H, used for automotive repair and scientific research. The device has 12 measurement parameters, the results of which are displayed on a 2.4-inch color display with a resolution of 320x240 pixels. Powered by a built-in 3000 mAh battery. The device differs from the previously reviewed FNIRSI-1C15 model in the presence of silicone case protection and a wider frequency range - 100-349 MHz.

Advantages:

• good screen in terms of brightness and viewing angles;
• displaying a large amount of information;
• convenient control;
• good autonomy and low consumption with a battery capacity of 3000 mAh.

Flaws:

• freezes periodically;
• significant errors.

Appearance

Buy on AliExpress.com

Additional information on this topic

We deliberately did not overload this article with technical details of oscilloscopes and a detailed description of their options. You can read all this on the pages of individual oscilloscope series. But for those who want to understand the issue as much as possible, we recommend that you familiarize yourself with this information:

12 criteria for choosing the optimal oscilloscope (in Russian) (30 pages; 7 MB)

Tutorial on the basic principles of measurements using oscilloscopes (in Russian) (60 pages; 2 MB)

Tektronix Oscilloscope Probe Selection Guide (English) (18 pages; 2 MB)

DPO digital phosphor technology in oscilloscopes - operating principle, application examples

Comparison and selection of 500 MHz oscilloscopes

To simplify the process of choosing a digital oscilloscope, you can use our experience and recommendations. We have more than 20 years of practical supply experience and we can immediately answer many questions about models, options, delivery times, prices and discounts. This will save your time and money. To do this, just call us or write to us by E-mail and we will be happy to answer your questions.

⑥ Oscilloscope Hantek 2D42, 2D72, 3-in-1

Rating: 4.9 Price: from RUB 7,597.63
up to
RUB 12,300.77
Go to store The Hantek 2D42 mini oscilloscope also includes an arbitrary waveform generator and a multimeter. Powered by 2 lithium-ion batteries with a capacity of 5200 mAh. Thanks to the stand, the device can be placed at an angle of 45 degrees. The device has a self-calibration function for checking the numerical values ​​of the vertical and horizontal deviation coefficients. The 2D72 model differs from the 2D42 in a wider frequency band - 70 MHz instead of 40.

Advantages:

• oscilloscope + signal generator (not available in models 2C42 and 2C72) + multimeter in one device;
• large equipment;
• Type-C connector;
• powered by 2 18650 batteries or cable;
• software for PC and laptop;
• two-channel oscilloscope with closed input.

Flaws:

• heavy;
• The functionality of the oscilloscope could be wider

Set

Buy on AliExpress.com

DS0120M

• Frequency band – 120 MHz.
• Sampling frequency – 320 MS/s.
• Automatic measurements – 12 parameters.
• Display type – LCD, 3.0″
• Dimensions – 190x140x45 mm.
• Weight – 390 g.

DS0120M is a pocket-sized two-channel oscilloscope that can be classified as a professional device. The power source is a 18650 lithium-ion battery, which is included in the package. LCD screen, with a resolution of 320x240 pixels, provides high clarity images.

The functionality of the model provides users with the ability to scan in three modes - automatic, normal and single. Built-in memory allows you to store up to 2500 waveforms with support for thumbnail viewing. The time base, amplitude, trigger slope, and other waveform parameters are set separately. Thanks to the ergonomic shape of the body, the device fits comfortably in the hand. The delivery set includes a silicone case that provides reliable protection from mechanical damage. Owners recommend taking additional care of protecting the screen and sticking film or glass on it.

⑦ RIGOL DS1102Z-E digital oscilloscope, 2 analog channels

Rating: 4.9 Price: RUB 21,624.54
Go to the store The two-channel portable oscilloscope RIGOL DS1102Z-E has an analog channel bandwidth of up to 100 MHz. The real-time sampling rate is up to 1 GS/s, in dual-channel mode – up to 500 MS/s. The waveform acquisition speed of up to 30,000 per second allows the device to be used for professional purposes.

Advantages:

• 2 analog channels;
• sampling rate up to 1 GS/s (up to 500 MS/s in dual-channel mode);
• has a 7-inch display 800×480 px;
• the presence of UltraVision technology, which increases speed up to 30,000 waveforms per second.

Flaws:

• small encoders, but they can be replaced.

Buy on AliExpress.com

Which oscilloscope is better

All oscilloscopes presented in the review are distinguished by their reliability and stability of readings. The devices have different functionality, which allows them to be used in industries with simple and complex tasks. The VyborExperta.ru team recommends choosing equipment taking into account the scope of application:

• Dso138 mini – for use at home and in classrooms;
• Megeon 15001 – the choice of monitoring specialists;
• Fluke 190-204 – for large enterprises;
• Rigol ds1102z-e is a laboratory device with wide functionality.

All the equipment in the review is worthy of the attention of a qualified user, but only the most reliable ones were awarded the title of the best devices in their categories.

⑧ Multimeter-oscilloscope MUSTOOL MDS8207

Rating: 4.9 Price: from RUB 7,125.40
up to
RUB 7,687.03
Go to the store The MUSTOOL MDS8207 multimeter with oscilloscope mode is made of durable plastic without rubber elements. The measurement accuracy is high, the error is 1-2%. Up to 100 results can be stored in the device's internal memory. The technical parameters of the oscilloscope provide a bandwidth of 40 MHz, so the device is used more as a multimeter. Power is supplied from three AA batteries.

Advantages:

• presence of a well-readable screen;
• small error, performs well as a multimeter;
• ease of use.

Flaws:

• powered by 3 AA batteries with high consumption;
• First of all, this is a multimeter, an oscilloscope is quite simple - for an entry-level one.

In hand

Buy on AliExpress.com

Conventional Input Channel with ADC
The typical input channel of a real-time digital oscilloscope uses an analog interface consisting of a preamplifier, attenuator, and sample and hold circuitry to fix the signal amplitude for the duration of the sample (Figure 1). An analog-to-digital converter (ADC) is used to serially convert the voltage levels coming from the sample-and-hold circuit into a stream of numerical values.

Assuming that the analog interface provides the full channel bandwidth, the ADC sampling rate becomes the main limiting factor. The Nyquist theorem states that to accurately represent all signal components within the required frequency range, the sampling frequency must be at least twice the maximum signal frequency. For example, a 25 GHz channel would require a sample rate of at least 50 GS/s. As bandwidth requirements increase, it becomes increasingly difficult to find an ADC that meets the conditions of the Nyquist theorem.

It is appropriate to consider the noise of a typical ADC input channel as this will form the basis for further discussion regarding channel noise associated with techniques for improving ADC performance. Since white noise by definition contains all frequencies, the power spectral density is evenly distributed in the Nyquist band (Fig. 2). For a channel with a sampling rate of 50 GS/s, the bandwidth, according to the Nyquist theorem, is 25 GHz. The oscilloscope's bandwidth-limiting filter (called an anti-aliasing filter) suppresses noise that occurs between the filter's cutoff frequency and the Nyquist frequency for a given channel.

Channels with temporary seal

If the ADC sample rate is not sufficient to meet the bandwidth requirements, you must find other ways to use the available components or create a new generation of ADCs. A common method for enhancing the capabilities of components is temporary compaction. In this case, the analog interface is designed to pass the entire signal bandwidth, and two parallel ADCs are used. Each ADC must support a sampling rate equal to at least half the frequency required to satisfy the Nyquist criterion. For example, if the analog interface provides a bandwidth of up to 45 GHz, then to achieve a sampling rate of 100 GS/s, two ADCs with a sampling rate of 50 GS/s can be interleaved (Fig. 3). In this case, the ADC clock signals must be phase shifted by 180°. The data is stored in memory included after each ADC, and once acquisition is complete, the complete 100 GS/s signal can be reconstructed by interleaving the acquired data (sometimes called demultiplexing). It should be noted that there is no limit to the number of interleaved ADCs, although as the number of ADCs increases, it becomes more difficult to synchronize them. Time multiplexing to reach the gigahertz range is used by all leading oscilloscope manufacturers.

Note that as the sampling rate increases, the white noise is distributed evenly across the new Nyquist band. If the sampling rate increases from 50 to 100 GS/s, the Nyquist bandwidth expands from 25 to 50 GHz (Fig. 4). When the noise characteristics of both interleaved channels are the same, the noise power density is halved. Of course, the purpose of time multiplexing in our case is to expand the system bandwidth by expanding the bandwidth of the input analog interface and increasing the sampling frequency. However, it should be noted that if the bandwidth is the same as described initially (using the same filter to limit the oscilloscope's bandwidth), the overall effect is to reduce the noise floor.

The use of this method in practice ensures a noise reduction of 15–20%.

Frequency multiplex channels

For over a century, downconverters have been used in receivers and other RF devices. The concept is simple: mix two frequencies, get the sum and difference of these frequencies (a process called heterodyning). If you correctly select one of the frequencies (for example, the local oscillator frequency) in relation to another frequency, you can obtain a difference frequency in a more convenient (usually lower) range and work further with it.

Downconverters have also been used in oscilloscopes for a very long time. Previously, the buck converter was an external unit, its matching and calibration was a very difficult task. Then step-down converters began to be built directly into oscilloscopes. If the oscilloscope channel local oscillator frequency is set to half the analog interface bandwidth, this will allow signals from the upper half of the oscilloscope bandwidth to be captured using one ADC, and signals from the lower half to be captured using another ADC (Fig. 5). Signal reconstruction by “gluing together” the upper and lower halves of the spectrum is performed in modern real-time digital oscilloscopes by a digital signal processor.

LeCroy was the first to implement such an approach in the form of a function built into a digital oscilloscope, called Digital Bandwidth Interleave (DBI). Keysight recently followed suit with “RealEdge” input channels. The main advantage for oscilloscope designers is that each ADC can have a sampling rate higher than the total channel bandwidth. However, this method poses other design problems. After capturing the data and storing it in memory, you need to increase the frequency of the high-band path to its original value using digital signal processing techniques. Combining the two halves of the spectrum and reconstructing the signal are quite complex tasks. Since the signal paths are not identical, differences must be compensated for through calibration, which is performed by the digital signal processor. In addition, due to the use of bandpass filters to divide the spectrum into two halves, it is problematic to accurately restore the central part of the spectrum. In the combining zone, problems arise with the uniformity of the amplitude-frequency response (AFC) and phase linearity.

Consider the amplitude-frequency response of the LeCroy 830Zi-A oscilloscope, which uses DBI in the range above 16 GHz (Fig. 6). It can be seen that the frequency response is quite uniform in the range of 0–5 GHz, but takes on a different character in the range of 15–30 GHz. LeCroy offers various "optimization" modes. The frequency response uniformity for two of these modes is strikingly different. For example, the amplitude value at 22 GHz in linear mode will be approximately 10% less than the actual value. In pulse optimization mode, the amplitude value at the same frequency of 22 GHz will be 20% less.

A similar problem is observed in the Keysight DSAX95004Q oscilloscope when using “RealEdge” inputs (Fig. 7). Overall, the Keysight does a better job of flattening the frequency response than the LeCroy, but pay attention to the portion of the graph above 32 GHz. The Keysight 50 GHz oscilloscope uses the same circuitry as the 63 GHz model, so it is not surprising that the anomaly in this instrument is observed at 32 GHz rather than 25 GHz. A deviation of the amplitude in this region by two or more decibels means that the error in its measurement at these frequencies exceeds 20%.

Let's consider what happens to channel noise when using frequency division multiplexing (Fig. 8). As discussed, the noise power spectral density is uniformly distributed over a Nyquist bandwidth equal to half the channel sampling frequency. Since each ADC processes half of the entire frequency range, there is no potential for noise reduction when moving from time division multiplexing to frequency division multiplexing (while maintaining the same bandwidth). In fact, when using frequency division multiplexing, the noise even increases.

This phenomenon is demonstrated by two screenshots of the Keysight DSAX95004Q oscilloscope, obtained in the standard channel with a 33 GHz bandwidth and in the “RealEdge” channel with the same bandwidth (Fig. 9). The Keysight oscilloscope's measured noise floor is 554 µV rms on the standard channel and 731 µV rms on the RealEdge channel, meaning the RealEdge channel is approximately 32% more noise than the standard channel.

Asynchronous time interleaving technology

Given the technical challenges associated with frequency multiplexing still used in gigahertz oscilloscopes today, Tektronix has come up with a new approach that overcomes some of the shortcomings of DBI and achieves the same extended bandwidth without the need for new ADCs. In the asynchronous time interleaving (ATI) method, a presampler is used as a harmonic mixer (Fig. 10). It sub-samples the input signal, thereby “wrapping” the spectrum back into the Nyquist band of the ADC. For example, a 70 GHz system can be achieved using an asynchronous clock speed of 75 GHz. As a result, the upper half of the 70 GHz signal is “wrapped” into the range from 0 to 37.5 GHz. The resulting data from the presampler is then digitized by the ADC at a rate independent of the presampler rate, such as 100 GS/s. Note that the presampler operates asynchronously with the ADC clock frequency.

The signal transformation chain looks like this (see Fig. 10). The input signal goes to the preamplifier and passes through a splitter to the presamplers. The spectrum at the output of one of the presamplers contains the difference between the spectra of the lower range and the upper range “wrapped” in this band, and the spectrum at the output of the other presampler contains their sum. These complex spectra are then passed through low-pass filters that suppress the high range while leaving the lower range (including the "wrapped" high range) through unchanged. The filtered signal enters the sample and hold circuit and is converted by the ADC.

Once the data has been converted and stored in memory, the original signal can be restored through digital mixing.

It should be noted that the two presamplers operate in antiphase (with a 180° shift), which is important for signal reconstruction. After digital mixing, the signal contains components with spectra obtained by adding and subtracting the spectra of the lower and upper ranges of the original captured data “wrapped” in its band. However, during the final combining of these signals, the 180° phase-shifted portions of the spectrum are canceled out, leaving only the original spectrum and the portion of the combined spectrum that is suppressed by a low-pass filter with a cutoff frequency of 75 GHz. As a result, only the spectrum of the signal from 0 to 70 GHz, originally received by the oscilloscope, is preserved.

The last step of combining is addition and division by two. This function returns the amplitude of the input signal to its original value.

The noise power spectral density in the ATI method is uniformly distributed over a bandwidth that is twice the sampling frequency of each ADC (Fig. 11). The result is lower overall passband noise than comparable DBI architectures.

The first production model to use ATI technology is the Tektronix DPO77002SX ATI oscilloscope (Fig. 12). It provides one channel of 70 GHz bandwidth and 200 GS/s sampling rate with ATI technology, or two channels of 33 GHz bandwidth and 100 GS/s sampling rate with conventional real-time capture.

Thus, Tektronix's ATI method has a number of advantages: it allows you to take advantage of existing ADCs to process higher frequency signals, provides the highest signal conversion accuracy and minimal noise.

⑨ JINHAN JDS6052S Handheld Digital Oscilloscope with Signal Generator

Rating: 4.8 Price: from RUB 6,070.92
up to
RUB 8,918.79
Go to the store The JINHAN JDS6052S compact digital oscilloscope has 1 channel and a narrow operating frequency - up to 30 MHz. The built-in signal generator allows you to calibrate the probe's input capacitance to increase the accuracy of the transmitted signal. The device can operate either from a built-in battery or from USB 2.0 power. The device is compatible with 100x probes, which allows you to correctly carry out measurements with high voltages.

Advantages:

• 2 in 1 device – oscilloscope and functional signal generator;
• Can run on both 18650 battery and USB.

Flaws:

• inconvenient interface and controls - you need to get used to it;
• comes without battery.

Buy on AliExpress.com

Stationary

FNIRSI-1014D – the most functional

The model performs the functions of an oscilloscope and signal generator. The device supports 12 different types of signals. Options include: Lissajous graphical display, thumbnail viewing, and checking the status of the circuit and individual nodes. The seller posted a detailed review of the meter on the website.

View on Aliexpress

Characteristics:

• display – 800x480, 7 inches;
• built-in memory – 1 GB;
• storage depth – 240 kbit;
• number of channels – 2;
• Max. test voltage – 40/400 V;
• input impedance – 1MΩ;
• bandwidth – 100 MHz.

Buyers highlight: good quality, clear interface, fast delivery.

Hantek DSO2C10 – simple control

The model is equipped with the functions of a 3-digit digital voltmeter and a 6-digit frequency meter. The settings are saved. The device is capable of taking 32 types of measurements in automatic mode. Peripheral interfaces are offered in several types.

View on Aliexpress

Characteristics:

• display – 800x480, 7 inches;
• sampling rate – 1 GS/s;
• memory depth – 8M;
• number of channels – 2;
• Max. test voltage – 40/400 V;
• bandwidth – 100 MHz.

The meter is supplied with two alligator cables, a 1:10 probe, and an installation disk. The packaging is reliable. Delivery - within 1-5 weeks.

HANMATEK DOS1102 – a good copy of the original rigol-1102

In terms of technical parameters, the device sacrifices little to the branded oscilloscope rigol-1102. At the same time, the price is affordable. The seller does not delay delivery either. After payment, the parcel arrives in 5-20 days.

View on Aliexpress

Characteristics:

• display – color 800x480, 7 inches;
• sampling rate – 1 GS/s;
• memory depth – 8M;
• number of channels – 2;
• Max. test voltage – 40/400 V;
• bandwidth – 110 MHz;
• body dimensions – 30x15.2x7 cm.

The device performs 28 types of measurements. This served as the basis for identifying the device as stationary. Thanks to its compact size, portability is maintained.

OWON SDS1102 – value for money

Tabletop device. It features a lightweight synchronization system. Used for tasks that do not require complex startup conditions and a large amount of memory.

View on Aliexpress

Characteristics:

• display – color 800x480, 7 inches;
• sampling rate – 1 GS/s;
• memory capacity – 10 KB;
• power supply – network 100-240 V;
• number of channels – 2+1;
• synchronization – by edge, video signal;
• bandwidth – 100 MHz;
• weight – 1.1 kg;
• body dimensions – 30x15.2x7 cm.

Purpose: circuit testing and debugging, production process, design, training, testing and vehicle maintenance.

Hantek DSO2C10 – economical tester

The device takes measurements and performs calculations with high accuracy. The functionality combines a 3-digit digital voltmeter and a 6-digit frequency meter. Supplied in a cardboard box. The model is included in the ranking of the best-selling measuring devices.

View on Aliexpress

Characteristics:

• display – color 800x480, 7 inches;
• sampling rate – 1 GS/s;
• memory depth – 8M;
• time range – 3.5 ns;
• number of channels – 2;
• synchronization – by edge, video signal;
• bandwidth – 100 MHz;
• weight – 2.9 kg;
• body dimensions – 31.8x14x15 cm.

Buyers highlight: a good option for solving simple problems, affordable price, simple controls, clear interface.

Hantek DSO5102P – compactness and great capabilities

The stationary oscilloscope is of the stationary type, but due to its compact size you can take it with you to field work. The model has a small thickness, less than similar devices. A convenient handle is built into the upper part of the case.

View on Aliexpress

Characteristics:

• display – color 800x480, 7 inches;
• sampling rate – 1 GS/s;
• signal rise time – 3.5 ns;
• number of channels – 2;
• power supply – 220V network;
• connection – USB host and devices;
• bandwidth – 100 MHz;
• weight – 2.1 kg;
• case dimensions – 31.3x14.2x10.8 cm.

Supplied in a cardboard box with measuring probes (2 pcs.), power cable, USB cable, software for connecting to a computer, instructions.

RIGOL DS1102Z-E – for production and laboratories

A professional device that performs the most accurate measurements. Suitable for work in laboratories where a large number of functions are required.

View on Aliexpress

Characteristics:

• display – color 800x480, 7 inches;
• sampling rate – 1 GS/s;
• oscillogram recording speed – 30000/s;
• number of channels – 2;
• memory depth – up to 24 MP;
• power supply – 220V network;
• connection – USB host and devices;
• bandwidth – 100 MHz;
• weight – 2.9 kg;
• body dimensions – 31.3x16x12.2 cm.

Among the advantages: synchronization option, UltraVision technology, bright and clear image on the display.

UNI-T UTD2102CEX – for amateurs and professionals

The device is capable of automatically measuring up to 34 signal parameters. Among the options: control of current strength, its intensity and frequency. Added such functions, built-in signal generator, wider display range 8div x 16div. A special feature is a unique independent time base function.

View on Aliexpress

Characteristics:

• display – color 800x480, 7 inches;
• sampling rate – 1 GS/s;
• signal collection speed – 5000 wfms/s;
• number of channels – 2;
• memory depth – 64kpts;
• power supply – 220V network;
• launch modes – edge, plus, video, tilt, alternative;
• bandwidth – 100 MHz;
• weight – 3.5 kg;
• case dimensions – 33.6x16.4x10.8 cm.

The device is equipped with probes and cables for connections.

RIGOL DS1202Z-E – high throughput

The device was developed using innovative UltraVision technology. Supports interfaces: USB Host&Device, LAN (LXI), AUX. There is a recording and playback function.

View on Aliexpress

Characteristics:

• display – color 800x480, 7 inches;
• sampling rate – 1 GS/s;
• oscillogram recording speed – 30000/s;
• number of channels – 2;
• memory depth – up to 24 MB;
• power – 50 W;
• bandwidth – 200 MHz;
• weight – 2.9 kg;
• body dimensions – 31.3x16x12.2 cm.

Supplied in original packaging with USB and power cables, passive probes (2 pcs.) and instructions.

Siglent SDS2104X – innovative technologies

The four-channel memory device has a powerful digital trigger function, serial decoding option and a logic analyzer.

View on Aliexpress

Characteristics:

• display – color 800x480, 8 inches;
• sampling rate – 2 GS/s;
• capture speed – 140000 wfm/s;
• number of channels – 4;
• memory depth – up to 140 MB;
• power – 50 W;
• bandwidth – 200 MHz;
• weight – 2.9 kg;
• body dimensions – 31.3x16x12.2 cm.

Buyers highly appreciated the best qualities of the model: registration of signals in real time, tracking of repeated signals, large bandwidth.