Select important indicators for test equipment

Taking a digital oscilloscope as an example, many users may know some of the oscilloscope's traditional indicators, such as bandwidth, sampling rate, memory depth, etc., and even appear in the selection of the index according to the size of the index, that the number is smaller than the number of small The good is not true! To really understand digital oscilloscopes, you must thoroughly perceive the true performance and quality of the products hidden behind the nominal indicators. Just as many consumers often care about the number of pixels when they purchase digital cameras, in fact, in addition to this number In addition, there are many (more) important indicators and materials that need to be considered.

These parameters are important in terms of scalability, number of supported communication standards, test accuracy, dynamic range, and demodulation bandwidth. Future base stations may evolve to dual-mode and multi-mode, and many mobile phones already have multi-mode capabilities, such as GSM and WCDMA dual-mode mobile phones. If the instruments support many communication standards, the types and quantities of instruments to be purchased will be greatly reduced. In addition, with the advent of 3G, LTE and other technologies, higher requirements have been placed on the instrument. Instruments with high test accuracy, large dynamic range, and large demodulation bandwidth are very popular. The development of mobile communication technology is very fast. At present, China does not have a large number of commercial 3G, and LTE, as a follow-up technology of WCDMA and TD-SCDMA, has already introduced a prototype. Network operators may speed up the introduction of new technologies. This poses a real challenge to base stations and terminal manufacturers. The test instruments they purchase now must have good scalability and can be easily upgraded to future technologies so that they can be more limited. Protect the investment of manufacturers.

For example, Rohde & Schwarz's signal sources, signal analyzers, and mobile phone testers all support almost all communication standards, and are designed to take into account the testing needs of the next few years (a common requirement is the demodulation bandwidth). For new communication standards, generally only upgrade software can be achieved.

In addition, the oscilloscope's bandwidth, sampling rate, etc. are common parameters of the oscilloscope. Oscilloscope bandwidth Due to the development of manufacturing and R&D technologies, the oscilloscope bandwidth can be corrected and compensated. However, these amendments and compensations are not a bad thing. Some customers do not want these technologies to be brought into the test. They need original test data, such as radar experiments. Tektronix currently offers pure hardware oscilloscopes in a full range of oscilloscopes from 1G to 2G. Oscilloscope bandwidth is the most realistic. Tektronix' front-end technology guarantees that the oscilloscope's hardware preamplifier will perform adequately. The sampling rate is an indicator of the ADC. The capture rate parameter reflects the concept of a memory management (whether it can find the desired signal in the saved signal). Tektronix uses segmented management to save information when the signal transitions. Including methods such as Inspector.

Now electronic engineers are more concerned about whether the purchased instruments can really solve the actual problems encountered in the test. Solving the problems is the real value of the oscilloscope, not the cold hardware indicators. LeCroy oscilloscopes are specifically designed to solve problems. Specifically, the newly adopted patented technology TriggerScan on the 7Zi series oscilloscopes can improve the efficiency by more than 20 times than the traditional method of capturing abnormal signals through fast refresh, which greatly improves the engineers' debugging. Circuit efficiency; long waveform acquisition and instrument response have always been conflicting oscilloscope performance metrics. Some vendors claim that their products can reach storage depths of hundreds of megahertz or even gigabytes, but when users actually use so much memory, The oscilloscope's response will be slow, and any simple operation such as vertical sensitivity adjustment will have to wait for the user to wait for a long time to see the result. LeCroy uses a specially optimized waveform processing algorithm in the 7Zi oscilloscope, which greatly improves the oscilloscope's fast response performance under deep memory operation conditions.