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Signal frequency detection system and method

A technology of signal frequency and detection system, applied in the field of frequency meter, can solve the problem of inability to test the signal frequency, and achieve the effect of expanding the measurement range

Inactive Publication Date: 2015-02-04
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a signal frequency detection system and method to solve the problem that the existing frequency meter cannot test the signal frequency below 1Hz

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, 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.

[0026] We take the highest frequency of the signal to be tested as 9999Hz as an example for illustration, then the system needs to select 4 counting display units, and each counting display unit includes 4-digit decimal counters, 4-digit latches, LEDs connected in sequence Display decoding / driver, current limiting resistor and 8-segment digital tube; such as figure 1 The system shown also includes a waveform generating chip, a frequency divider by two, a double-pole three-throw switch, an inverter, and a NOR gate signal module. The double-pole three-throw switch includes two layers, and each layer...

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Abstract

The invention relates to a signal frequency detection system and a method. The signal frequency detection system comprises a waveform generating chip, M divide-by-ten frequency dividers, a double-pole M+1-throw switch, a divide-by-two frequency divider, a phase inverter, a 2-input nor gate and N count display units, each count display unit comprises a 4-bit decimal system counter, a 4-bit latch, a light-emitting diode (LED) display decoder / driver, a current-limiting resistor and a eight-section nixie tube which are sequentially connected, the test for the signal frequency of above 1Hz can be achieved, and the signal frequency of below 1Hz can be tested through switching of a double-pole three-throw switch.

Description

technical field [0001] The invention belongs to the technical field of frequency meters, and relates to a signal frequency detection system and method. Background technique [0002] In industrial control systems, it is often necessary to measure the frequency of various signals. However, the existing complex frequency meters are expensive, and various simple frequency meters have obvious deficiencies. The simple frequency meter mainly adopts the following detection method: within 1s, the counter is used to count the test signal, and the counting result of the counter is the frequency of the signal. Although this detection method is easy to implement, it is difficult to test signal frequencies below 1Hz. Therefore, the existing simple frequency meter can only test the signal frequency above 1Hz. Contents of the invention [0003] The purpose of the present invention is to provide a signal frequency detection system and method to solve the problem that the existing freque...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
Inventor 张海涛刘翠苹白舸张世伟
Owner HENAN UNIV OF SCI & TECH
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