www.bewet.fora.pl

loczytzn

About the characteristics and use of digital oscilloscope should pay attention to the problem

Sampling rate 1GS / s, then the actual use of the sampling rate of the oscilloscope time base is set to: time base set value = 50 / (1 × 10 9 th) = 50nsldiv aware of the time base set value is very important, Because this value is the collection of non-repeating signal oscilloscope the fastest time base settings. If the oscilloscope's input signal is 100KHz sinusoidal signal, the oscilloscope displays the signal is 50KHz, this is because the oscilloscope's sample rate is too slow, resulting in the aliasing phenomenon. According to Nyquist theorem, the sampling rate higher than the signal frequency components at least 2 times the aliasing will not occur, if a 1o0KHz signal, at least 200KHz sampling rate. Then, the frequency of the waveform of an unknown, how to determine whether the displayed waveform generated aliasing it? Scan rate can be gradually changed by t / div to a faster time base file, see the frequency of the waveform parameters are rapidly changing, and if is that the waveform aliasing has occurred; or shaking of the waveform in a faster time base file stabilized, also shows the waveform aliasing has occurred. 3.2 analog and digital real-time bandwidth Bandwidth Bandwidth refers to the frequency response is usually at the lower 3dB frequency (bandwidth characteristics of each of the different vertical sensitivity profile), analog oscilloscope bandwidth is a fixed value, and the digital oscilloscope analog bandwidth and digital bandwidth Two real-time bandwidth. Real-time bandwidth of the digital oscilloscope for repetitive signals using sequential sampling or random sampling techniques can achieve the highest bandwidth. The maximum number of real-time bandwidth = sampling frequency / K (K factor for the waveform reconstruction). Bandwidth from the definition of the two can be seen only for repeat cycle analog signal bandwidth of the measurement, and real-time bandwidth suitable for both digital signals and repeated signals in a single measurement. Bandwidth of the instrument indicated that the analog bandwidth. Verification of the digital oscilloscope, frequency bandwidth of the test is also the analog bandwidth. Generally lower than the analog bandwidth digital real-time bandwidth. Digital real-time bandwidth can be found in the instructions, measuring a single signal, reference number should be real-time bandwidth, otherwise it will produce incorrect results. 3.3 digital display space in the transition from the rise in analog oscilloscopes, oscilloscope rise time is an extremely important indicator, and in the digital oscilloscope, the rise is not the same or even explicitly given as an indicator. General rise time in the \Measurement of the reasons digital oscilloscope that automatically measure the rise time of not only the location of sampling sites, but also with the scanning speed. On the same wave, scanning speed, small rise time. In actual measurement, although the waveform rise time is a certain value, measured with a digital oscilloscope result of very different because of different scanning speed. Simulation shows transition from the rise has nothing to do Time and scanning speed, and figures show the transition from the rise and the scanning speed and the location of the sampling points are related. When using the oscilloscope can not measure time according to anti-launched waveform rise time. References I oscilloscope basis. FLUKE Corporation 2 U.S. electronic measuring + China Metrology Publishing House, 1998 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ..., ● Welcome to subscribe to the year 2002, \Technology \Publication based on the practical, practical, effective, highlighting the areas of domestic and international measurement test new theories,[link widoczny dla zalogowanych], new methods, new technologies, new products,[link widoczny dla zalogowanych], the degree, the length of the content related degree, optical and optoelectronic technology, laser, electrical, mechanical, acoustic , temperature,[link widoczny dla zalogowanych], thermal properties, radioactive, non-destructive testing,[link widoczny dla zalogowanych], sensors, radios and other degree of automation and instrumentation of research results, new technology development, testing, testing and adjusting of equipment, testing experience, a point of order to explain the error analysis. , T, - r, l is the industrial enterprises, universities, research institutes, the majority of workers in particular, a test measuring feather staff access to information, technology, experience, academic exchanges garden. Magazine is a bimonthly, national unity ISSN CN5l a 1465/TB, International Standard Serial Number ISSN1006-317X, 48 pages, Kui 3O million in price,[link widoczny dla zalogowanych], welcome to units and individuals set free. Magazine advertising messages also show business, advertising business work permits wide commercial character 03I6 River Road, welcomed the publication of advertisements in the magazine, publication will be the most favorable price for all the friends service. Post office; r-paragraph: Test Technology Research Institute, Chengdu, China, stripping \
相关的主题文章：

[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]