Frequency characteristic tester

Abstract

The invention discloses a frequency characteristic tester comprising a PC machine, a communication interface, a single chip, a digital control frequency sweep signal source, an A / D conversion module, a phase difference measuring module, a tested circuit, and peak detection and attenuation; the PC machine is connected with the single chip through the communication interface; the digital control frequency sweep signal source is respectively connected with the phase difference measuring module, the tested circuit, and the attenuation; the tested circuit is connected with the attenuation; the attenuation is connected with the peak detection; the peak detection is connected with the single chip through the A / D conversion module; the attenuation is connected with the single chip through the phase difference measuring module. The frequency scope, signal amplitude, sweep frequency mode of a testing signal and inputted attenuation coefficient parameters can be inputted through a soft panel on the PC machine, thus receiving orders and data from the PC machine, controlling the frequency sweep signal source to form a needed frequency sweep signal, controlling amplitude measurement and phase difference measurement, parsing and processing information, and displaying or printing the measuring result.

Description

technical field [0001] The invention relates to a frequency characteristic tester. Background technique [0002] In circuit testing, it is often necessary to test the frequency characteristics. The frequency characteristics of the circuit reflect the relationship between the amplification performance of the amplifier and the frequency of the input signal. The frequency characteristic tester is a measuring instrument that displays the amplitude-frequency and phase-frequency characteristic curves of the circuit under test. Traditional frequency scanners are expensive, bulky, and can only display amplitude-frequency characteristic curves. They can also obtain phase-frequency characteristic curves, and can even print frequency response curves of the network under test. This brings a lot of convenience to use and provides Therefore, the present invention proposes a frequency characteristic tester to solve this problem. It has the characteristics of wide measurement range, high p...

AI Technical Summary

Problems solved by technology

Traditional frequency scanners are expensive, bulky, and can only display amplitude-frequency characteristic curves. They can also obtain phase-frequency characteristic curves, and can even print frequency response curves of the network under test. This brings a lot of convenience to use and provides Therefore, the present invention proposes a frequency characteristic tester to solve this problem

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