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Equal-precision frequency testing system based on FPGA and design method thereof

A test system and equal-accuracy technology, applied in frequency measurement devices, frequency-to-pulse-sequence conversion, etc., can solve problems such as difficulty in determining the best sub-measurement point, large difference in measurement accuracy of the signal to be measured, and reduce measurement errors. , the effect of improving the measurement accuracy

Inactive Publication Date: 2014-06-04
HENAN UNIV OF SCI & TECH
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Problems solved by technology

This method can make up for the shortcomings of the direct frequency measurement method to a certain extent, but it is difficult to determine the best sub-measurement point, and the measurement accuracy of the signal to be measured at various frequencies varies greatly

Method used

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  • Equal-precision frequency testing system based on FPGA and design method thereof
  • Equal-precision frequency testing system based on FPGA and design method thereof

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 1 , figure 2 As shown, in order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific examples described here are only used to explain the present invention, not to limit the present invention.

[0021] Let us explain that the frequency of the signal to be tested is 0.1Hz~99999999.9Hz, then the system needs to use nine 8-segment digital tubes; the system uses the FPGA chip EP2C8Q208C8 as the control core, and the FPGA chip EP2C8Q208C8 is connected to an external power chip, reset chip, configuration circuit and EEPROM Wait for the chip to complete the design of the minimum FPGA system, so that the FPGA chip...

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Abstract

The invention discloses an equal-precision frequency testing system and method based on an FPGA. According to the system, frequency demultiplication is carried out on outer standard clock signals, a preset gate signal is obtained, and then an actual gate signal is obtained. The rising edge of an outer signal to be tested and the rising edge of the standard clock signal are counted so that the periodicity of the outer signal to be tested and the standard clock signal in the actual gate signal can be obtained. The frequency of the signal to be tested is obtained according to the obtained periodicity and the frequency of the standard clock signal, and finally the frequency of the signal to be tested is sent to a nixie tube to be displayed. Through the method, high frequency measurement precision can be obtained, and the measurement precision of the frequency is almost equal.

Description

technical field [0001] The invention relates to a frequency testing system and method, in particular to an FPGA-based equal precision frequency testing system and testing method. Background technique [0002] In industrial control systems, it is often necessary to measure the frequency of various signals. The existing frequency meter mainly has two measurement methods: one is the direct frequency measurement method, which is to add the measured frequency signal to an input terminal of the gate after being processed by the pulse shaping circuit, and only within the opening time T of the gate, The counted pulses are sent to the decade counter for counting. If the value of the counter is N, the frequency of the measured signal can be obtained as f=N / T. This measurement method has a large relative error in the low frequency band, that is, it cannot meet the design accuracy requirements in the low frequency band; the other is a combination The frequency measurement method refer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/10
Inventor 张海涛张亮亮叶宇程李晓强
Owner HENAN UNIV OF SCI & TECH
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