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Which is better to buy a usb or desktop oscilloscope. How to choose a digital oscilloscope. Advantages of a digital oscilloscope. Oscilloscope internals

Introduction

Previously, the site already had an article about, which is not purchased, but homemade. The Instrustar ISDS220B oscilloscope is also a USB attachment for a PC.

I repeat that not everyone likes such oscilloscopes, but if you need a device that does not take up much space on your desktop and is portable, then this is an ideal option. Although it is quite convenient to use (all manipulations can be done using the mouse, and there is no need to reach anywhere).

Functional

The functionality is the same as in a desktop digital oscilloscope. The device is equipped with two probes and one probe for the generator. Regulators for compensation of probes are located on the connection side. After purchase, it is necessary to compensate the probes. To do this, there are two ears on the front panel for connecting probes. They constantly present a rectangular signal with a frequency of 1 KHz. We connect the probes one by one and, using the included plastic screwdriver, achieve an even rectangular signal.

Another nice feature is the built-in signal generator. Frequency adjustment range for sine wave: 0-10 MHz, for triangle and rectangle: 0-2 MHz (for a rectangular signal there is a fill adjustment). There are also output amplitude and offset controls on the rear panel. Maximum output amplitude: ±5 V.

Characteristics

Now about the characteristics of the oscilloscope itself. Maximum sampling frequency 200 MHz (in single-channel mode). Maximum input voltage: ±16 V (when switching the divider on the probe to “10” - ±160 V). There are three operating modes: “Auto”, “Standby” and “Single”. There is also a customizable trigger, adjustable by level and triggered by a decrease, increase in the signal, or both. The time sweep is adjustable from 10 Ns to 10 C. The voltage sweep is adjustable from 10 mV to 10 V (when using a probe divider, select the division coefficient in the drop-down list).

For the oscillogram, the device has 512 KB of RAM (which is quite a lot). This makes it possible to capture more samples into memory and view them by scrolling the waveform to the right or left. There is also a measurement mode. You can add or remove signal parameters that need to be measured. It is possible to save waveforms as pictures and as data files (.csv). A professional oscilloscope mode is also provided.

Although I didn’t see anything new in it, the adjustments were just slightly changed. There is also a spectrum analyzer with many settings. You can enable the signal generator settings tab right in the oscilloscope window.

Oscilloscope internals

Inside the Instrustar ISDS220B it is structured like this: the input signal, having passed through the analog part assembled on AD8065 operational amplifiers, enters the input of an AD9288 type ADC, one per channel.

In general, the AD9288 is already a 2-channel ADC with a sampling frequency of 100 MHz. In Instrustar ISDS220B, each such MS uses both of its channels, thus achieving a sampling frequency of 200 MHz. It clocks them and also transmits data to the Altera FPGA. Two RAM memories are used for storage. Altera also generates a signal for the signal generator, which is converted from digital to analog using a DAC, R2R and amplified using an op-amp. Data transfer via USB is handled by the CY7C68013 chip.

Upon inspection, the board was missing many ceramic SMD power supply capacitors. I soldered them on, although it did not give any effect. Well, now we should point out the disadvantages of this device. The first disadvantage is the inability to calibrate the device at all sweep ranges. Because of this, the beam is not at zero, but slightly above or below it. The second minus is the slight signal noise. This is not critical, especially since there is software anti-aliasing. The third minus concerns the generator - the output impedance is 200 Ohms, although for most cases you need 50 Ohms. Perhaps that's all. It should be noted that the software is well thought out and easy to use. Installs easily and works on versions from Windows XP to Windows 10 (32 and 64 bit). In this case, after installing the software, the driver is installed automatically. Well, another important plus is that it takes up minimal space on the desktop, even less than modern professional oscilloscopes such as Rigol, Tectronix or Siglent.

Good afternoon, Habr!

I bring to your respected audience a review of the Hantek6022BL oscilloscope/logic analyzer.

For those interested, please refer to cat.

Specifications

Oscilloscope:

channels: 2
Bandwidth: 20 MHz
sampling rate: 48 Msa/s
memory capacity: 1Ms
interface: USB 2.0

Logic analyzer:

logical channels: 16
Bandwidth: 10 MHz
memory capacity: 48Msa
memory depth: 1 Ms

Are common

dimensions: 205 x 120 x35
power: from USB port
weight: 0.382 kg

Appearance

The appearance is definitely a 5. Shiny and stylish aluminum body, plastic lining, mirrored Hantek inscription. It’s immediately obvious that they don’t skimp on design here.

Front view. Two BNC connectors for probes, a logic analyzer connector, and calibration pins. Everything is predictable.

USB, a mysterious button and an equally mysterious hatch with the inscription USBXI, under which a strange connector is hidden.

Equipment

The kit includes the oscilloscope itself, a USB cable, two cables to the logic analyzer, 20 clamps for the logic analyzer, two probes for the oscilloscope complete with multi-colored marking rings and screwdrivers for adjusting the frequency response of the probe. The probes are called PP-80, but have a bandwidth of 60 MHz, not 80, as one might think. The reasons for this lie, it seems to me, in the properties of the gloomy Chinese genius.
There is also a disk with software, which is of little use these days.

Subjective impressions

At first glance, an excellent thing. A compact, lightweight device, in a very high-quality aluminum case (like an iPad, the seller writes on aliexpress).
In addition to the listed interfaces, on the device body there is a latching button (and this is not a power switch, as one might think) and a connector labeled USBXI, not described in the documentation, and probably intended for connecting several devices to each other. There are also contacts for a built-in calibration generator.
It's time to install the software and turn on the device.

Beginning of work

The easiest way to download the software is from the Russian site hantek.ru; registration is not even required, unlike the “main” site hantek.com. The instructions are in English, as is the software, although there are Russifications on the website.
So, the software has been downloaded, installed, and the device is connected to the computer. We connect the probes, connect them to the contacts of the calibration generator and launch the oscilloscope program. We see two signals of a rectangular (almost) shape. Use a screwdriver to adjust the probes so that the signals acquire a perfect rectangular shape.
After the device has warmed up for 20 minutes (according to the instructions), we perform self-calibration. It seemed like nothing had changed, but my soul became calmer.

After playing a little with the channel sensitivity and sweep time knobs (nothing new has been invented here), let’s move on to a deeper study of the software.

Scan

The trigger has a single trigger mode: Edge, the user can select the source (channel 1 or channel 2 and edge, positive or negative).
<лирическое отступление>
Let me make a lyrical digression. When I was studying at the institute, some teachers really did not like expressions like “leading front” and “rear front”. A front is only a front, by definition, they said, so you should just say “front,” and what is called a “rear front” is correctly called a “recession.” Deep down I agree with them, but here I will use the phrases “leading front” and “rear front”.

Autostart, “Normal” mode, and one-time startup are provided. The trigger does not have any more “tricky” modes.

The horizontal scan is adjustable from 1 ns (a completely useless range for this device) to 3000 seconds. There is a display mode with horizontal scanning (x(t), y(t)) and with X-Y mode (convenient, for example, for Lissajous figures).

Channel sensitivity

The sensitivity of the channels is adjustable within the range of 200mV/div to 5V/div with a probe ratio of 1:1, and allows you to work with probes with dividers up to 1:10000 (honestly, I have never seen such things, it must be a very high-voltage thing).

The trigger level and horizontal shift can be changed simply with the mouse, but the values of these quantities are not displayed anywhere. The moment the trigger is fired is not tied to any divisions on the oscillogram, or to the center of the screen, or to anything at all.

Mathematics channel

Displayed as a third waveform and can display the sum, difference, product, and quotient of channel A and B signal values, as well as the spectrum (FFT). For FFT, you can select the window type: rectangular, Hamming, Hanning, Blackman. You can select a linear or logarithmic amplitude scale.

"Ref" channel

In fact, this is not any special channel, it is simply a display of a previously saved signal on the screen next to the current ones, for example, for comparison.

Measurement mode

"Horizontal" measurements

The period and frequency of the signal, the rise and fall time of the signal, the pulse width and the width of the gap between pulses are measured in units of time and as a percentage of the full period.

"Vertical" dimensions

Maximum and minimum signal value, peak-to-peak voltage, top and bottom voltage, average value, rms value, positive and negative overshoot percentage.

Cursor measurement mode

Perhaps the only mode that is more convenient in a “virtual” oscilloscope than in a “real” one. Simply select a rectangle on the screen with the mouse and see deltaT and deltaV. There are three cursor modes: vertical, horizontal and “cross”, that is, both at once. Why the first two are needed is unclear.

Auto installation

A “magic” button that configures the optimal (according to the program) display mode.

Interpolation

Due to the discrete nature of the measurements, the displayed data can be interpolated in the following ways: “step” mode, that is, no interpolation, “linear” mode, and sin(x)/x interpolation, which, in theory, should be the most accurate. Unfortunately, it was not possible to see the effect of its inclusion.

Display Settings

Display by vectors or points, display of a coordinate grid, brightness of waveforms and grids, nothing unusual.

Saving data

Waveforms can be saved in different formats: txt, xls, doc and bmp. The first three are simply sample values in text form, the last one is a screenshot of the oscillograms. There is also a ref format designed to work with a ref channel.

The picture above shows the program interface with two signals at inputs A and B, with a mathematics channel into which FFT is output, with cursors and with the measurement mode turned on.

In general, the oscilloscope is like an oscilloscope, only the simplest functions, but they work fine. It could have been done better. Rating 4.

Logic analyzer

The logic analyzer is displayed in a separate window.

We see 16 signals and... that's it. No settings, no launch conditions, nothing at all. Signal capture is started manually with a button. However, there is one setting: SampleRate can be selected from 100 kSa/s to 48 kSa/s. Signals are captured until the memory is full (1M samples).

The logic analyzer is in no way connected with the oscilloscope; it cannot be triggered by its trigger, nor can it be triggered by its trigger; it cannot be triggered either by the edge of any logical signal, or, moreover, by more complex events and conditions.
After capturing signals, the analyzer interface begins to slow down ungodly.
Those who worked with real analyzers will cry bitter tears.

In general, the analyzer gets a 2 plus rating (after all, at least something works). There may be some hope that the logic analyzer will perform better in the next version of the software.

Alternative software

There is nothing good in this regard yet. There is alternative software for DSO-6022BE, but it did not work with this model. In addition, it is practically no different from the native one, except for minor changes in the GUI design.
There is software for Hantek devices for Linux, but it does not support the DSO-6000 line at all.

Drivers

Windows 7 did not automatically find anything; of course, it had to specify the folder with drivers manually.

Mysterious button and connector on the rear panel

As far as can be understood from the manual, this button is intended to call the software. However, it does not perform this function, and at the moment is just a button-for-beauty. The same can be said about the USBXI connector. Even if it is intended to combine several devices into one, neither a cable nor any traces of support for this function in the software could be found.

Overall rating

This is, of course, a toy. If using an oscilloscope is your daily routine, then it is better to buy a normal oscilloscope, without the “USB” prefix. Even an inexpensive oscilloscope has many more features and functions. Not to mention the logic analyzer.
However, if you rarely need an oscilloscope, or if you have a very limited budget, then you can work with this model.

SDK

The manufacturer has posted an SDK, which can open up some non-trivial possibilities for using the device, for example, in automated measuring systems. But I haven't looked at the SDK yet.

Geekporn

What's inside?

Remove the plastic covers and unscrew the front and back covers. Now you can remove the board.

Photo of the board

What is what on this board? I labeled all the microcircuits with numbers. Let's see which is which.

1. The “brains” is the Cypress cy7c68013a-100axc microcontroller (http://www.cypress.com/?docID=45142). Microcontroller based on 8051 core with High-speed USB interface. In principle, an understandable choice. There is no need for high speed from the processor, since all processing occurs on the computer side, but a fast USB is needed.

2. SN74LVC16245A (http://www.ti.com/lit/ds/symlink/sn74lvc16245a.pdf) - frontend of the logic analyzer. Regular 16-bit buffer.

3. 24LC02BI (http://ww1.microchip.com/downloads/en/DeviceDoc/21709J.pdf) – 2 kb EEPROM, for storing any settings. Why there are two of them is unclear.

4. AMS1117-3.3 (http://www.advanced-monolithic.com/pdf/ds1117.pdf) – 3.3V linear power supply regulator.

5. Inout A0505S-2WR (http://pdf1.alldatasheet.com/datasheet-pdf/view/611588/MORNSUN/A0505S-2WR2.html) – converter +5V to bipolar voltage 5V for powering the analog frontend.

6. AD8065 (http://www.analog.com/static/imported-files/data_sheets/AD8065_8066.pdf) – operational amplifier with FET inputs and a frequency band of 145 MHz.

7. EL5166 (http://www.intersil.com/content/dam/Intersil/documents/el51/el5166-67.pdf) – wideband operational amplifier from Intersil (bandwidth at unity gain 1.4 GHz).

8. 74HC4051 (http://www.nxp.com/documents/data_sheet/74HC_HCT4051.pdf) - 8-channel analog multiplexer/demultiplexer

9. The most interesting chip, the ADC, is hidden under the heatsink. A little heating with a soldering iron, and the heatsink came off, and under it was the AD9288 (http://www.analog.com/static/imported-files/data_sheets/AD9288.pdf) - 8-bit ADC, 2 channels of 100 MSa/s.

Everything is done extremely simply and minimalistically, but neatly. Even too simple, I was hoping to see at least some kind of FPGA. The analog frontend has a large frequency reserve, which is very good. “Adult” oscilloscopes often use the same hardware for an entire model range, and the frequency band of younger models is cut off in software for marketing reasons. Knowing the required dance with a tambourine, you can turn a younger model into an older one that uses the capabilities of the hardware 100%.
But in this case, older models from the same line have a sampling frequency of 150 and 250 MHz, that is, at least a different ADC.

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In this section, you will certainly find something interesting, exciting and educational for yourself. Perhaps even someday you will be able to be one of the first to learn about a discovery that will not just change the world, but will change your consciousness.

Good afternoon
I bring to your respected audience a review of the Hantek6022BL oscilloscope/logic analyzer.

For those interested, please refer to cat.

Specifications

Oscilloscope:

channels: 2
Bandwidth: 20 MHz
sampling rate: 48 Msa/s
memory capacity: 1Ms
interface: USB 2.0

Logic analyzer:

logical channels: 16
Bandwidth: 10 MHz
memory capacity: 48Msa
memory depth: 1 Ms

dimensions: 205 x 120 x35
power: from USB port
weight: 0.382 kg

Appearance

The appearance is definitely a 5. Shiny and stylish aluminum body, plastic lining, mirrored Hantek inscription. It’s immediately obvious that they don’t skimp on design here.

Front view. Two BNC connectors for probes, a logic analyzer connector, and calibration pins. Everything is predictable.

USB, a mysterious button and an equally mysterious hatch with the inscription USBXI, under which a strange connector is hidden.

Equipment

Subjective impressions

At first glance, an excellent thing. A compact, lightweight device, with a very high-quality aluminum case (like an iPad, the seller writes on aliexpress).
In addition to the listed interfaces, on the device body there is a latching button (and this is not a power switch, as one might think) and a connector labeled USBXI, not described in the documentation, and probably intended for connecting several devices to each other. There are also contacts for a built-in calibration generator.
It's time to install the software and turn on the device.

Beginning of work

The easiest way to download the software is from the Russian site hantek.ru; registration is not even required, unlike the “main” site hantek.com. The instructions are in English, as is the software, although there are also Russifications on the site.
So, the software has been downloaded, installed, and the device is connected to the computer. We connect the probes, connect them to the contacts of the calibration generator and launch the oscilloscope program. We see two signals of a rectangular (almost) shape. Use a screwdriver to adjust the probes so that the signals acquire a perfect rectangular shape.
After the device has warmed up for 20 minutes (according to the instructions), we perform self-calibration. It seemed like nothing had changed, but my soul became calmer.

After playing a little with the channel sensitivity and sweep time knobs (nothing new has been invented here), let’s move on to a deeper study of the software.

Scan

Channel sensitivity

Mathematics channel

"Ref" channel

In fact, this is not any special channel, it is simply a display of a previously saved signal on the screen next to the current ones, for example, for comparison.

Measurement mode

"Horizontal" measurements

"Vertical" dimensions

Maximum and minimum signal value, peak-to-peak voltage, top and bottom voltage, average value, rms value, positive and negative overshoot percentage.

Cursor measurement mode

Auto installation

A “magic” button that configures the optimal (according to the program) display mode.

Interpolation

Display Settings

Display by vectors or points, display of a coordinate grid, brightness of waveforms and grids, nothing unusual.

Saving data

The picture above shows the program interface with two signals at inputs A and B, with a mathematics channel into which FFT is output, with cursors and with the measurement mode turned on.

In general, the oscilloscope is like an oscilloscope, only the simplest functions, but they work fine. It could have been done better. Rating 4.

Logic analyzer

The logic analyzer is displayed in a separate window.

In general, the analyzer gets a 2 plus rating (after all, at least something works). There may be some hope that the logic analyzer will perform better in the next version of the software.

Alternative software

Drivers

Windows 7 did not automatically find anything; of course, it had to specify the folder with drivers manually.

Mysterious button and connector on the rear panel

Overall rating

SDK

The manufacturer has posted an SDK, which can open up some non-trivial possibilities for using the device, for example, in automated measuring systems. But I haven't looked at the SDK yet.

Geekporn

What's inside?

Remove the plastic covers and unscrew the front and back covers. Now you can remove the board.

Photo of the board

What is what on this board? I labeled all the microcircuits with numbers. Let's see which is which.

It happened in my life, as I think in the lives of most people who have been studying electronics for quite a long time, that having started the study of electronics with the design of various electronic crafts, we gradually, with the acquisition of experience in design, and at the same time in minor repairs of home electronic equipment, switch from design to to a greater extent. This is not a very profitable business, as any master electronics engineer will tell you - sometimes you have to “dig” equipment for a week, or even more, and still it is not always possible to achieve results, in particularly difficult cases.

And the profit from doing repairs turns out to be “paid” by the piece, and if so, then this work cannot be called easy. But gradually the understanding came that it is much easier to work when you have two things: a good tool and at least a minimum set of widely used spare parts, the most popular radio components. And if with the second everything is simple - each time you invest part of what you earn from repairs in the purchase of radio components, in small wholesale on Ali Express, then with the tool it is more and more complicated. A good tool already costs a lot of money, but after working with a good tool, you won’t want to work with a bad one)).

Buying a USB Oscilloscope

I needed an oscilloscope, mainly to watch the PWM signal on the mosfets gates in switching power supplies and inverters of monitors or LCD TVs. Of course, Soviet oscilloscopes are still unbeatable in terms of price/quality, but in my home workshop there was already very little space, since part of the space is taken up by equipment brought in for repairs, and part of the board is for soldering to spare parts.

And despite the fact that a Soviet oscilloscope can be found in more or less normal condition in our city for 2000, I decided to push myself harder and buy a model Intrustar ISDS205A. According to reviews, it should keep an “honest” 12 MHz, which was more than enough for my needs.

It cost about 4,000 rubles on Ali, there were models with better characteristics, but more expensive. Bought. The oscilloscope is two-channel, the kit includes two probes with 1:10 dividers. The oscilloscope body is made of metal. On one side, at the end of the oscilloscope, there are connectors for connecting probes.

On the other end there is a USB connection connector and a power-on indication on the LED. The kit also included a small screwdriver for adjusting the oscilloscope probe divider, apparently. Also in the box was a plastic bag for carrying the oscilloscope without a box while traveling.

Everything together looked quite solid and indicated that the device was not assembled in a simple Chinese basement; the presence of instructions and a warranty card also confirmed this.

As expected, the oscilloscope coped with its tasks (monitoring the presence of a PWM signal on the mosfets gates) with a bang, although for such purposes, it seems that even the oscilloscope operating frequency at an “honest” 1 MHz is sufficient, without distorting the signal shape.

I was also pleased with the function of the clamp in the form of a hook, which fits onto the oscilloscope probe and opens when you press the plastic body of the clamp. Thus, our soldered wire from the contact, the signal being measured at a certain point on the board, which may be required if we cannot touch the contacts on the board, is securely fixed with a clamp, and ensures good contact with the oscilloscope probe.

The shell has 2 operating modes: simplified and advanced. I currently use the simplified mode, for my purposes it is enough, but it’s always nice that the device allows you to produce more than you currently need, because you never know what needs for repairs and measurements will be tomorrow .

The screenshots show the appearance of the oscilloscope shell, a close-up of the oscilloscope settings panel, and work in the shell of the older model of the oscilloscope. Well, here I think everything will be clear to those who have previously worked with Soviet oscilloscopes, the differences are minor - everything is intuitive.

I was also pleased that, unlike Soviet oscilloscopes, here there is no need to count either the frequency of the signal or its voltage by divisions on the screen; in the shell we see both values in the form of ready-made numbers.

Conclusion about the oscilloscope

In general, today I am completely satisfied with this purchase and I think that I could recommend it to beginning radio amateurs - electronic engineers. It is worth the money, and now, due to the strengthening of the ruble, there is an opportunity to save a small amount when purchasing or even take an older model. Happy repairs everyone! Review prepared by AKV.

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