6074BD USB Oscilloscopes 4 Channels 70Mhz Bandwidth Oscilloscope Digital PC Hand held Electroscopic with 25Mhz Signal Generator
Meet or exceed the performance of bench oscilloscopes, four independent analog channels, 1GSa / s high-speed real-time sampling, 2mV-10V / DIV high input sensitivity, 250MHz high bandwidth.
Pass / Fail testing, extensive trigger functions, dynamic cursor tracking waveform recording and playback, and desktop oscilloscope similar interface, easy to use, cost-effective.
USB2.0 interface, plug and play, free external power supply.
Excellent industrial design, compact, easy to carry, and the shell is made of anodized aluminum of the iPad, not only beautiful, but also improves the alloy surface hardness, good heat resistance and abrasion resistance.
More suitable for tablet PCs, notebook computers, product line maintenance, easily on business.
Software Support: Windows10, Windows 8, Windows 7
Waveform data can be time-and voltage output to EXCEL, BMP, JPG.
More than 20 kinds of automatic measurement functions, PASS / FAIL Check, be suitable for engineering applications.
Waveform average, persistence, intensity, invert, addition, subtraction, multiplication, division, X-Y display.
FFT spectrum analysis.
A computer can connect many DSO, extend channel easily.
USBXI standard interface, easy to insert USBXI chassis, consisting of a combination of instruments.
Secondary development library DLL provides, Labview \ VB \ VC \ QT developers provide example
1 x 6074BD usb oscilloscope;
2 x oscilloscope probe;(Note:Just 2pcs probes in the package,if you want to buy more,please contact with us directly!!!)
2 x BNC - clip cable;
1 x usb cable;
1 x CD (driver / manual... inside)
How to choose oscilloscope?
You should know what you plan to use the oscilloscope to observe. What is the special feature of the signal you want to capture? Does your signal have complex characteristics? Is your signal repeat signal or single signal? What is the bandwidth, or rise time, of the signal transition you want to measure? What signal characteristics do you intend to use to trigger short pulses, pulse widths, narrow pulses, etc.? How many signals are you going to display at the same time? Analog or digital?
In all, the traditional view thinks that the analog oscilloscope has the familiar panel control, the price is low, therefore always thinks that the analog oscilloscope "USES conveniently". However, with the increasing speed and price of A/D converter year by year, as well as the increasing measuring capacity and virtually unlimited functions of digital oscilloscope, digital oscilloscope has become the leader.
How is the bandwidth?
Bandwidth is generally defined as the frequency when the amplitude of sinusoidal input signal attenuates to -3db, that is, 70.7%. Bandwidth determines the basic measuring ability of oscilloscope to signal. With the increase of the signal frequency, the oscilloscope's ability to display the signal accurately will decline, if there is not enough bandwidth, the oscilloscope will not be able to distinguish the high-frequency change. The amplitude will be distorted, the edges will disappear, and the details will be lost. Without sufficient bandwidth, all the properties of the signal obtained, such as ringing and singing, are meaningless.
A rule of thumb for determining the bandwidth effectiveness of the oscilloscope you need is the "5x rule"; Multiply the highest frequency component of the signal you want to measure by 5. This will give you an accuracy of more than 2% in your measurements
In some applications, you do not know the bandwidth of the signal you are interested in, but you know the fastest rise time, most digital oscilloscopes use the following formula to calculate the associated bandwidth and the rise time of the instrument: bandwidth = 0.35 ÷ the fastest rise time of the signal.
There are too kinds of bandwidths: repeat (or equivalent time) bandwidth and real time (or single time ) bandwidth. Repeat bandwidth is only applicable for repeat signals to display comes from sampling during multiple signal acquisition. Real-time bandwidth is the highest frequency that can be captured in a single sample of oscilloscope, and the requirements are quite demanding when the captured events do not often occur. Real-time bandwidth is associated with sampling rates.
Since wider bandwidth tends to mean higher prices, evaluate the frequency components of the signals you normally look at against your budget.
How is the sampling rate?
Defined as sampling times per second (Sa/s), the frequency of signal sampling by exponential oscilloscope. The higher the sampling rate of the oscilloscope, the higher the resolution and clarity of the waveform displayed, and the lower the probability of important information and events being lost.
The minimum sampling rate becomes important if the slow signal over a long time range is observed. In order to maintain a fixed waveform number in the displayed waveform record, the horizontal control button needs to be adjusted, and the displayed sampling rate will also change with the adjustment of the horizontal control button.
How to calculate sampling rate? Measuring method depends on the waveform measured and the signal reconstruction method adopted by oscilloscope.
To reproduce the signal accurately and avoid confusion, the Nyquist theorem states that the sampling rate of the signal must be no less than twice its highest frequency component. However, the premise of this theorem is based on infinitely long and continuous signals. Since no oscilloscope can provide a record length of infinite time and, by definition, low-frequency interference is discontinuous, sampling rates of twice the highest frequency components are usually insufficient.
In fact, the accurate reproduction of signal depends on its sampling rate and the interpolation method used in the gap of signal sampling points. Some oscilloscope will provide following choice to operator: sinusoidal interpolation method for measuring sinusoidal signal, and linear interpolation method for measuring rectangular wave, pulse and other signal types.
There is a useful rule of thumb for comparing sample rates and signal bandwidths: if the oscilloscope you are looking at has interpolation (filtered to regenerate between sampling points), the ratio (sampling rate/signal bandwidth) should be at least 4∶1. Without sine interpolation, the ratio of 10∶1 should be adopted.
How fast does the screen refresh?
All oscilloscopes flash. That is to say, the oscilloscope captures the signal at a certain number of times per second, and the measurement between these measuring points is no longer carried out. This is the waveform capture rate, also known as screen refresh rate, expressed as the number of waves per second (WFMS /s). Sampling rate represents the frequency of input signal sampled by oscilloscope in a waveform or period.Waveform acquisition rate refers to the oscilloscope acquisition waveform speed. Waveform acquisition rate depends on the type and performance level of oscilloscope, and has a large range of changes. The oscilloscope with high wave acquisition rate will provide more important signal characteristics and greatly increase the probability of the oscilloscope to quickly capture instantaneous abnormal conditions, such as jitter, short pulse, low frequency interference and instantaneous error.
Digital storage oscilloscope (DSO) can capture 10 to 5,000 waveforms per second using a serial processing structure. DPO digital fluorescence oscilloscope USES parallel processing structure, can provide higher waveform capture rate, some up to millions of waves per second, greatly improve the possibility of intermittent capture and difficult to capture events, and allow you to find the signal problems faster.
What is the storage depth?
Storage depth is a measure of how many sampling points an oscilloscope can store. If you need to capture a pulse string continuously, you need the oscilloscope to have enough memory to capture the entire event. The required storage depth, also known as record length, can be calculated by dividing the length of time to be captured by the sampling speed required to accurately reproduce the signal.
Capturing the effective trigger of the signal in the right position can usually reduce the storage capacity of the oscilloscope.
Storage depth is closely related to sampling speed. The depth of storage you need depends on the total time span to be measured and the required time resolution.
Modern oscilloscopes allow users to select record lengths to optimize the details of some operations.Analysis of a very stable sinusoidal signal requires only 500 points of record length;But to parse a complex stream of digital data, you need a million points or more of record length.
What kind of trigger do you need?
The trigger of the oscilloscope can synchronize the horizontal scanning of the signal at the right position, which determines whether the signal characteristic is clear or not. Trigger control buttons stabilize repeated waveforms and capture single waveforms.
Most users of universal oscilloscopes only use edge triggering, and you may find it useful to have other triggering capabilities in some applications. Especially for the fault search of new design products.Advanced triggering allows the event of interest to be isolated, making the most efficient use of sampling speed and storage depth.
Today there are many oscilloscopes with advanced triggering capabilities: you can trigger based on pulses defined by amplitude (such as short pulses), time-limited pulses (pulse width, narrow pulse, conversion rate, build/hold time), and pulses (logical trigger) described by logical state or graph.The combination of extended and regular triggering functions also helps to display video and other hard-to-catch signals, so advanced triggering capabilities provide a great deal of flexibility in setting up the test process and greatly simplify the job.
How many channels do you need?
The number of channels you need depends on your application. For the general economic fault - finding applications, the need is a dual - channel oscilloscope. However, if you want to observe the interrelationship of several analog signals, you will need a 4-channel oscilloscope. Many engineers working in analog and digital systems are also considering 4-channel oscilloscopes.A newer option, called a mixed-signal oscilloscope, combines the logic analyzer's channel counting and triggering capabilities with the oscilloscope's higher resolution into a single instrument with a time-dependent display.
How to use oscilloscope correctly?
How to use oscilloscope correctly? At the beginning of choosing an oscilloscope, you already have a price range in mind. The price of an oscilloscope depends on a number of factors, including bandwidth, sampling rate, number of channels, and storage depth. If you only buy it based on price, you may not end up getting the performance you need.
Methods to choose one oscilloscope
(1) Confirm whether you need one analog or digital oscilloscope?
Both digital and analog oscilloscopes have its advantages and disadvantages.
With the development of modern technology, the function of digital oscilloscope is stronger, the response is faster and the price is lower.These advantages make it difficult for analog oscilloscopes to compete with advanced digital oscilloscopes. At present, almost all customers choose the digital oscilloscope, analog oscilloscope has been OUT of the basic.
(2) Confirm your demand on bandwidth
Instruments that measure ac waveforms usually have a frequency upper limit, and if the frequency of the waveform is above that the accuracy of the measurement will deteriorate.The upper limit of the frequency is the bandwidth of the instrument. Usually defined as the response of the instrument to lower the frequency by 3bB, the value of the bandwidth of the instrument you need depends on the characteristics of the signal being measured and the accuracy of the measurement you wish to obtain. An oscilloscope has two types of widths, namely, repeat (or analog) bandwidth and real time bandwidth. Many digital oscilloscopes provide analog bandwidths that are higher than their basic sampling rates. This is possible. If a signal repeats, the oscilloscope does not have to complete all the collection at one time. Instead, it can obtain part of the waveform when each trigger occurs, and constitute the display waveform after several cycles of triggering. (This process is usually so fast that you won't notice it happening.) the repeat-bandwidth metric is independent of the oscilloscope's sampling rate.In fact, this indicator is usually used to measure the bandwidth of the oscilloscope analog amplifier portion.Real - time bandwidth is suitable for non - repeating or single signal. The oscilloscope completes digitization in a trigger process, so the real-time bandwidth depends on the sampling rate of the oscilloscope, and the ratio between the sampling rate and the bandwidth is not fixed.If the oscilloscope is digitally reconfigurable, the ratio is closer to 4:1. If it is not refactored, the ratio is usually 10:1.
(3) Confirm numbers of channels you need
In general, the number of channels you need depends on the subject to be measured. At present, dual channel oscilloscopes are the most popular. For most engineers, however, a four-channel oscilloscope is more useful for some applications. The following points should be considered: do you need to capture multi-channel signals at the same triggering event?If so, choose an oscilloscope with each channel available for simultaneous sampling or independent A/D conversion. If the signal you are observing is a repeated signal, then it is not necessary to collect at the same time. Some oscilloscopes are in 2+2 form, that is, two channels are fully functional, and the other two channels are auxiliary channels with limited attenuation range. In this case, two A/D converters are Shared by four channels. Auxiliary channels provide additional flexibility when you are observing digital signals. For dual channel oscilloscopes, external triggers may be useful. It can use a signal without observation as an external trigger source without occupying the input channel of an oscilloscope. If you want to make digital timing measurements that require more than four channels of oscilloscopes, you may wish to consider using a logic analyzer. Although at this point you give up the vertical resolution of the measurement, you gain multiple channels and additional triggering and analysis capabilities.
(4) Confirm sampling rate you need
For a single signal measurement, the most critical performance indicator is the sampling rate, that is, the rate at which the oscilloscope takes a "quick picture" of the input signal. High sampling rate can produce high real - time bandwidth and high real - time resolution. Most oscilloscope manufacturers use a ratio of sampling rate to real time bandwidth of 4:l (if digital reconfiguration is used) or 10:1 (no digital reconfiguration) to prevent false waves. Some oscilloscopes provide the ability to independently control the sampling rate so that you can adjust both the sampling rate and the amount of data (time base) displayed on the screen so that the two Settings do not have to be tied down. This feature allows you to observe the waveform at the desired temporal resolution.
(5) Confirm storage depth you need
The storage depth of your oscilloscope depends on the total time range required and the time resolution required. If you want to store long periods of time at high resolution, you need to choose a deep storage oscilloscope. In this way, you can use a high sampling rate when the horizontal scanning speed is low. This will greatly reduce the chance of false waves and obtain more detailed information about the waveform.
(6) Examine and evaluate the triggering capability
Many general oscilloscope users are used to using edge trigger. In some applications, if an oscilloscope has other trigger capabilities, you will find it useful for your measurements. Advanced triggering features can isolate the events you wish to observe. In digital applications, an oscilloscope that triggers a specific pattern between multiple channels is useful for problem solving. In addition, the state trigger can be used to synchronize the mode trigger with the outer clock edge. Burr trigger occurs when positive or negative burr occurs or when a pulse is wider or narrower than the set width. These characteristics are especially important for fault detection. When the fault occurs, the forward event (using delay or horizontal position knob) is observed to determine the cause of the problem. If you need more advanced logic triggering capabilities, you can still consider using a logic analyzer. The TV trigger can trigger the presence as well as the specific line you need to observe.On some oscilloscopes, this feature is an option function.
(7) Evaluate burr catching ability
Three important factors affect the oscilloscope's burr capture ability: update rate: the digital oscilloscope must first capture data, then process it, and finally display it. The number of times an oscilloscope can complete these three processes in one second is called update rate. An oscilloscope with a fast update rate has a higher chance of capturing incidental burrs. The multi-processor structure oscilloscope has a faster update rate than the traditional single-processor structure oscilloscope, which makes it more suitable for capturing the occasional events. A multiprocessor architecture can produce display throughput and response times similar to analog oscilloscopes.
Peak detection capability: most digital oscilloscopes lose sampling points at low sweep speeds, thus reducing the effective sampling rate.This leads to the problem that narrow pulses, which are easily observed when set to a fast time base, disappear at low sweep speeds.However, for the special sampling mode of peak detection or burr detection, the maximum sampling rate is maintained at all scanning speeds, and the maximum and minimum values obtained in each sampling period are recorded.The smallest burrs that can be detected are related only to the sampling rate of the oscilloscope.
Burr trigger: an oscilloscope with burr trigger enables you to isolate burr that is difficult to detect and trigger when burr occurs. This feature can help you find the cause of abnormal conditions during circuit operation.
(8) Confirm the analysis function you need
With automatic measurements and the analytical capabilities built into an oscilloscope, you can get your work done easily and in less time. Digital oscilloscopes usually have sequential measurement functions and analysis options that analog oscilloscopes cannot have. Arithmetic functions include addition, subtraction, multiplication, division, integration and differentiation. Statistical measurements (minimum, maximum, and average) can quantitatively describe the uncertainty of a measurement, which is valuable in measuring noise characteristics and timing limits. Some digital oscilloscopes can also provide FFT function. An oscilloscope with all of the above advanced features might cost more, so you should decide for yourself whether the extra money is worth it. You'd better choose an oscilloscope with these characteristics according to the actual application.
(9) Evaluation of archiving capability
Most digital oscilloscopes can be connected to a PC, printer, or plotter via GPIB, rs-232, or a parallel port. But you should find out what kind of interface you can provide and what type of printer it will match. You should know that the output from laser and inkjet printers is of much higher quality than that from thermal printers. Using a digital oscilloscope with a floppy disk drive or software package, you can easily transfer waveform images and waveform data to a PC. These features will save time if you want to include a captured screen image in a report or if you want to convert waveform data into a table.