Equal excitation characteristic automatic test method for travelling wave tube with preamplifier
An automatic testing, traveling wave tube technology, applied in the direction of vacuum tube testing, etc., can solve the problems of limitation, system infinite loop measurement accuracy, etc., and achieve the effect of simple and convenient use, easy transplantation, and high measurement accuracy
Inactive Publication Date: 2017-04-26
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology
This negative feedback algorithm can achieve power control well when the preamplifier is not added, but once the preamplifier is added, due to the influence of the gain fluctuation of the preamplifier, the input power of the traveling wave tube may not follow the signal when adjusting the power of the signal source. The source power changes, at this time the system may have problems such as dead cycle and low measurement accuracy
These shortcomings have caused the existing automatic test system to be greatly limited in the actual testing of the excitation characteristics of traveling wave tubes and the like; to solve the above problems
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[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments; it should be understood that the embodiments are for reference and illustration only, and do not constitute a limitation to the protection scope of the present invention.
[0024] This embodiment provides an automatic test method for excitation characteristics of a traveling wave tube with a preamplifier, and its test process is as follows figure 2 As shown, the test system used is as follows image 3 As shown; two instruments are mainly used in the system: the signal source with GPIB / LAN interface and the dual-channel power meter; in order to ensure the measurement quality, the harmonic component of the signal source should be small; the power head and the high-power load used by the power meter There must be good matching performance; the directional coupler must have flat coupling, high directivity and good port matching; depending on the tr...
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The invention belongs to the technical field of microwave test and provides an equal excitation characteristic automatic test method for a travelling wave tube with a preamplifier. The method realizes equal excitation power control of the travelling wave tube through a dichotomy-based feedback mechanism introduced at the input end of the travelling wave tube. In the test method, when Pin=Pset, the output power Pout of the travelling wave tube is equal excitation characteristic of a working frequency point of a travelling wave tube to be tested; in the initialization phase, signal source output power is set to be the minimum power; in the measurement start phase Pin<Pset, the signal source output power increases constantly according to power stepping; and when Pin>Pset, recording is carried out to obtain a signal source output power range (a, b), and the signal source output power is searched and updated within the range through a dichotomy method until Pin=Pset. In the process, due to convergence of the dichotomy algorithm, the method can solve the problem of endless loop possibly occurring in a conventional automatic test system, and ensures stability of the automatic test system; and the method is higher in measurement accuracy.
Description
technical field [0001] The invention belongs to the technical field of microwave testing, and in particular relates to an automatic testing method for excitation characteristics of a traveling wave tube with a preamplifier. Background technique [0002] Traveling wave tubes are widely used in radar, electronic countermeasures, communications and other fields as the core device for microwave power amplification. The basic definition of the gain of a traveling wave tube refers to a certain frequency point, but in many cases it is also necessary to understand the relationship between the gain and the frequency. When it comes to the relationship between the gain and frequency of a traveling wave tube, it must involve what kind of gain, or the gain obtained under what conditions. Some applications, such as preamplification, require understanding the relationship between the gain and frequency of the traveling wave tube under small signal conditions; some applications require kno...
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Login to View More IPC IPC(8): G01R31/25
CPCG01R31/25
Inventor 黄桃周小社宫大鹏李斌
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA