Method for realizing rapid power automatic calibration of frequency spectrometer
An automatic calibration and spectrum analyzer technology, applied in instruments, measuring devices, measuring electrical variables, etc., can solve problems such as uncertainty, reduce workload, avoid misoperation and erroneous records, and improve operational efficiency.
Active Publication Date: 2016-05-04
创远信科(上海)技术股份有限公司
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Problems solved by technology
The frequency response characteristics of RF devices will inevitably lead to the output power of the RF front-end, and there is uncertainty in the measurement frequency band of the spectrum analyzer; Uncertainty caused by errors in changing the attenuation and gain of the gain-adjustable IF amplifier
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[0046] In order to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments.
[0047] The present invention will solve the following problems:
[0048] a) Solve the problem of automatically obtaining and adjusting the output power of the RF front end. Since the output power of the RF front-end has different gains at different reference levels, in order to fully utilize the dynamic range of the ADC, the output power of the RF front-end needs to be close to the maximum conversion level of the ADC and cannot exceed this level to avoid overflow. Manual acquisition requires frequent switching of the input attenuator and IF amplifier gain to meet power requirements, which is laborious and inefficient.
[0049] b) Solve the problem of large workload of obtaining the output power of the RF front-end point by point within the broadband frequency. Due to the large measurement frequency band o...
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The invention relates to a method for realizing rapid power automatic calibration of a frequency spectrometer. The method comprises the following steps: configuring a signal source output frequency to be a first obtaining frequency point; configuring an attenuation amount input to an attenuator and arranging the gain of a gain adjustable intermediate frequency amplifier to be zero; configuring signal source emission power to be maximum reference level; reading a power value displayed on a power meter; configuring an initial reference level value and an initial attenuation amount; reading and storing the power value on the power meter as a power value under current reference level; and after all reference level under all frequency points is already measured, normalization is performed on all recorded power values and an analog-to-digital conversion parallel table. The method for realizing rapid power automatic calibration of the frequency spectrometer, employing such a structure, can greatly reduce the workload. In a narrowband of 1% relative bandwidth, frequency response can be linearly estimated, the whole process is completed by a program set in advance, the operation efficiency is improved, and the application scope is wider.
Description
technical field [0001] The invention relates to the technical field of calibration of instruments and meters, in particular to the technical field of power calibration of spectrum analyzers, and specifically refers to a method for fast automatic power calibration of spectrum analyzers. Background technique [0002] Spectrum analyzer is an instrument for studying the spectrum structure of electrical signals. It is used to measure signal parameters such as signal distortion, modulation degree, spectral purity, frequency stability and intermodulation distortion. It can be used to measure certain components of circuit systems such as amplifiers and filters. Parameter, is a multipurpose electronic measuring instrument. Modern spectrum analyzers can analyze electrical signals in all radio frequency bands from very low frequencies below 1 Hz to submillimeter bands of 30 GHz. structured as figure 1 shown. [0003] A low-pass filter, an input step attenuator, a mixer, a variable-g...
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Login to View More IPC IPC(8): G01R35/00
CPCG01R35/007
Inventor 鲁永智
Owner 创远信科(上海)技术股份有限公司