PXI (PCI extensions for instrumentation) bus-based frequency characteristic testing device and method

Abstract

The invention provides a PXI (PCI extensions for instrumentation) bus-based frequency characteristic testing device and method, relates to the field of electricity and aims to solve the problems such that the existing frequency characteristic testing device is complex in structure, high in price, large in size and inconvenient to carry. The testing device comprises a PXI bus, a signal generating module, a signal input / output module and a data processing module. The signal generating module generates a multi-channel digital sinusoidal signal for testing use, on a computer, and through the PXI bus, transmits the multi-channel digital sinusoidal signal to the signal input / output module which outputs it to a test object; the signal input / output module acquires frequency response signals of the test object corresponding to channels, and feeds the signals to the data processing module of the computer through the PXI bus; the data processing module performs calculation to obtain phase-frequency characteristic curves of and amplitude-frequency characteristic curves of the signals. The testing device is simple in structure, low in price, small in size and easy to carry.

Description

technical field [0001] The invention belongs to the electrical field, and in particular relates to a frequency characteristic testing device and method based on a PXI bus. Background technique [0002] Frequency characteristic test equipment is a test tool used to analyze system stability and other motion characteristics. The test principle is to select several sinusoidal signals with frequency values ​​as excitation signals within the frequency range under investigation, and measure each excitation signal separately. Under the stimulus response, and then through a certain algorithm to find the frequency characteristics of the response signal. A frequency response tester generally consists of four parts: a signal generation module, a signal acquisition module, an amplitude and phase detection device, and a display module. [0003] In the conventional frequency response tester, the signal generation module, the amplitude and phase detection device, and the display module are...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a frequency characteristic testing device and method based on PXI bus, which is used to solve the problems of the existing frequency characteristic testing device, such as complex structure, high price, large volume, inconvenient portability, inability to display the amplitude-frequency characteristic curve and obtain the phase-frequency characteristic curve. question

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