High precision frequency/period measurement method for single channel counter

Abstract

A high-precision frequency / period measurement method for a single-channel counter, including: the software needs to configure the measurement cycle number register before the measurement starts, so as to determine the measurement duration and the measurement cycle number; then configure the measurement mode register to set it to Set to multi-period measurement mode; after this setting is completed, the hardware will automatically start to work and calculate the corresponding period or frequency value. The present invention adds a multi-period measurement function in the working mode of the counter, and integrates two counter channels in one counter channel; in the case of the existing method, use this multi-period measurement method to accurately measure the period / frequency Before, at least 8 registers need to be configured; after using the method of the present invention, only 2 registers need to be configured before each measurement, and compared with the original method, the obtained result can also maintain the same measurement accuracy.

Description

technical field [0001] The invention relates to a single-channel counter data testing method, in particular to a single-channel counter high-precision frequency / period measuring method. Background technique [0002] The counter products on the market are generally designed to provide 5 interface signals for each counter channel on the panel, that is, a measured signal, an external time base signal, a gating signal, a trigger signal, and a pulse output signal. Then, by configuring the internal function registers, the time base signal and the signal to be tested are selected, and they are set to work in the specified mode, and finally the measurement and measurement of frequency, period, pulse width, pulse interval, and pulse count are completely realized. Pulse output function. [0003] When performing frequency / period measurements of periodic signals, the principle is described in figure 1 , by using a high-precision time base signal, count the number of cycles of the time...

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Problems solved by technology

[0018] A further comparison of the implementation difficulty and measurement time of the above two methods shows that the main advantage of the first method is that the measurement time remains unchanged, while the disadvantage is that in order to increase the time base frequency, the hardware needs to be upgraded to improve the time base frequency. The frequency of the base signal and the operating frequency of the measurement circuit enable the corresponding hardware platform to work at a higher clock frequency, which requires a higher cost; the advantage of the second method is that it does not need to modify the existing hardware platform, and the cost Lower, the disadvantage is that it takes more measurement time to get the measurement results

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