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A digital fi‘equeney meter designed with FPGA development software Q-~us 11 is introduced．The 1 Hz—l MHz input measured pulse signals of the digital ii‘equency meter can be used for measuring frequency，period，pulse width and duty ratio，etc．The test results stably display O71 3 seven—segment numeric tubes，and the measuring ranges may be switched over automatically．The measuring error is equal to or less than 0．1％． -A digital fi equeney meter designed with FPGA development software Q-~ us 11 is introduced. The 1 Hz-l MHz input measured pulse signals of the digital ii equency meter can be used for measuring frequency, period, pulse width and duty ratio, etc. The test results stably display O71 3 seven-segment numeric tubes, and the measuring ranges may be switched over automatically. The measuring error is equal to or less than 0.1.
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基于FPGA／CPLD芯片的数字频率计设计.pdf