digital storage oscilloscope portable oscilloscope usb oscilloscope 100mhz
100mhz digital oscilloscope USB oscilloscope
1. 1GSa/s Sampling rate
2. 2 channels
3. 7” Widescreen LCD color display
4.USB host/device:Support USB printer and USB flash drive
1.Industrial power design,troubleshooting,installation and maintenance.
2.Electronic design,troubleshooting,installation and maintenance.
3.Circuit design and debug
4.Education lab and training institution
5.Repair and service
6.Production test and quality inspection
2.The oscilloscope has a totally new ultrathin appearance design, and is small in size and more portable.
3.7-inch widescreen color TFT LCD displays clear, crisp and more stable waveform display. 25% more viewing area with the menu switched off.
4.Storage/ Memory depth: single channel: 40Kpts; double channels: 20Kpts.
5.Various trigger functions: Edge, Pulse, Video, Slope and Alternation.
6.Unique digital filtering and waveform recording functions. Pass/Fail function.
7.Shortcut key "PRINT" to save screenshot to the attached USB disk.
8.Standard configuration interfaces: USB Host, USB Device, RS-232.
9.USB Host: support storage of USB flash disk and upgrading of USB flash disk system software.
10.USB Device: support PC connection for remote communication.
11.Power cord satisfying the standard of the user's country
12.Packing list :USB cable ,CD (containing PC software GAScope1.0 and user’s manual)
13. 32 kinds of automatic measurement and manual cursor tracking measurement functions.
14.Two groups of reference waveforms, 16 groups of common waveforms, 20 groups of internal storage/output; support waveform setting, external storage and output of CSV and bitmap file by USB flash disc (CSV and bitmaps cannot be output from USB flash disc).
15.Adjustable waveform brightness and screen grid brightness.
16.The pop-up menu display mode realizes more flexible and more natural for users’ operations.
17.Various kinds of language interface display.
18.On-line help system.
Input coupling: AC,DC,GND
Input impedance: 1M?±∥16pF±3pF
Maximum input voltage:
400V (DC+AC peak value, 1MΩ input impedance) (Only to 200MHz
800V (DC+AC peak value, 1MΩ input impedance)
Probe attenuation: 1X, 10X, 100X, 1000X
Packing & Delivery
1.the production packed by a platic bag first.
2.then will packed by the pearl cotton in front and back of the goods.
3.then packaged by a standard of the export carton inner box.
4.then packaged by a standard of the expor carton big box.
1.small order we usually have them in stock, and shipping by express.
2.20ft container ,it's need about 20working days,and shipping by sea.
3.OEM orders,we will discuss the time with you .
Window technology in frequency domain of oscilloscope
The FFT function of oscilloscope USES window technology to reduce the influence of spectrum leakage.Before executing the DFT, the DFT frame is multiplied by a window function of the same length for each sample.Window functions are usually bell-shaped and reduce or eliminate discontinuities at both ends of the DFT frame.
The four most commonly used window functions are listed below for recommended purposes:
(1) Rectangle - measures a sudden transient signal in which the signal level before and after the event is almost equal
(2) Hamming – measurement of sinusoidal, periodic, or narrow-band random noise, where the signal level before and after the event is significantly different
(3) Hanning - measuring amplitude accuracy (low at analytical frequency) with significantly different levels of transient or burst signals before and after an event
(4) Blackman/Harris - measure frequency amplitude, measure waveform with single frequency, search for higher harmonics
The response characteristic of digital oscilloscope and its choose and buy skill
Another reason why high speed digital oscilloscope chooses brick wall reaction type is to avoid or minimize Aliasing phenomenon. When using digital oscilloscopes to measure high speed signals, graphics confusion can occur, mainly because some signals are mixed with unnecessary waveforms when reproducing the sampled high speed signals. These mixed signal frequency components can distort the original signal waveform and, in severe cases, cause measurement errors.
Most of the pattern confusion occurs in the analog to digital converter (adc) continuous signals, which contain components that exceed the Nyquist frequency, or half the sampling frequency.This component retraces in the Nyquist frequency domain and appears in the oscilloscope measurement bandwidth. It can be clearly seen from the frequency characteristic diagram that the figure confusion effect of the brick wall reactive oscilloscope is negligible.
Under the same conditions, it can be clearly seen that in the field beyond the Nyquist frequency of 2GHz, there is almost no signal, which can inhibit the occurrence of confusion.
In addition, if 20GHz, 10GHz and 5GHz sampling frequencies are used to measure waveforms with a period of 2.2ns and a rise time of about 90ps, different results will be obtained.The lower the sampling frequency is, the longer the actual measurement value of rising time is, and the waveform cannot be faithfully presented.
At present, the high-speed serial interface measurement USES the real-time sampling broadband digital oscilloscope, and the sampling frequency of the high performance machine equipped with the analog to digital converter is up to about 20GHz. Generally, in order to reduce the occurrence of graphics confusion, the sampling frequency of a gaussian reactive oscilloscope should be 4-6 times of the input signal, while that of a brick wall reactive oscilloscope only needs 2.5 times.
Generally, the frequency band is lower than 1GHz, so gaussian reaction system is mostly adopted, while the instruments higher than 1GHz are mostly brick wall reaction system.Table 2 shows the advantages and disadvantages of the two types of reactive oscilloscopes.
Choose oscilloscope according to performance requirement
So, how to choose the most suitable oscilloscope? There are four simple steps:
Calculate the highest frequency component fmax of the measured signal.The upper limit of the signal frequency component can be calculated by measuring the rising time of the signal.Assuming that the rise time is migrated from 20% to 80%, the approximate value can be estimated using the mathematical formula (0.4/ signal rise time) rather than directly from the data transmission rate.Take the popular third-generation bus PCIExpress, which in most cases has a rise time of about 100ps.
Select the response characteristics of the oscilloscope. That is to choose a suitable one between the gaussian reaction system and the brick wall reaction system.
The necessary input bandwidth must be secured. It is related to the measurement error of rise time. An instrument company has done simulation experiments: if the brick wall reactive system allows 3% error, the bandwidth can be calculated with (1.4 fmax); If the error is limited to 10%, use (1.2 fmax) to calculate. When the tolerance error is 20%, it is calculated by (1.0 fmax).
Estimate the lowest sampling frequency. This value takes advantage of the above bandwidth value, which is a minimum (2.5 bandwidth) for a brick wall reactive oscilloscope.
The above four points can be used to illustrate a case: the rise time of 100ps digital signal, its fmax is 4GHz, select the brick wall reaction oscilloscope, assuming that the error of the rise time is limited to 3%, then the bandwidth of the input signal is 5.6ghz, therefore, the minimum sampling frequency also needs 14GHz.
If the sampling frequency of 14GHz is applied to the gaussian reaction system, the input bandwidth becomes 3.5ghz, and the rising time of the measured signal is 220ps, which is half of the difference with the brick wall reaction system.Some wide-band real-time oscilloscopes rely on the active application of digital signal processing to realize the characteristics of brick wall reactive system.After all, circuit technology alone is unlikely to achieve desirable characteristics.
In a word, whether the bandwidth and sampling frequency are suitable or not is an important pointer when choosing expensive oscilloscope.In addition, understanding the characteristics of the test instrument is also the key to mastering the correct measurement.