測場儀利用核磁共振（NMR）原理，使用邊緣振蕩器法對磁場進(jìn)行測量。計(jì)量顯示
部分以CPLD 芯片EPM7128SLC84-6 和單片機(jī)OM4368BN 為核心部件，使用Verilog HDL
和C 語言設(shè)計(jì)頻率計(jì)，測頻范圍為1MHz~100MHz。通過對共振點(diǎn)處邊緣振蕩器的振蕩頻率進(jìn)行測量，由單片機(jī)根據(jù)拉莫進(jìn)動(dòng)公式計(jì)算出磁感應(yīng)強(qiáng)度，送液晶顯示器輸出。設(shè)計(jì)中引入了自動(dòng)量程轉(zhuǎn)換，減少人工干預(yù)程度。
關(guān)鍵詞：磁感應(yīng)強(qiáng)度；核磁共振；拉莫進(jìn)動(dòng)；頻率測量；自動(dòng)量程轉(zhuǎn)換
Abstract: The device measures the magnetic field based on the theory of nuclear magnetic
resonance (NMR) and marginal oscillator. The measurement and display part of it takes
EPM7128SLC84-6 and OM4368BN as the core components. It uses Verilog HDL and C language to design a frequency meter, the range of which is from 1MHz to 100MHz. The device can measure the oscillator frequency when the resonance occurs, get the magnetic induction based on the Larmor precession formula, and display it by the Liquid Crystal Display (LCD).The device contains an automatic range changing technology, so it can reduce the degree of manual intervention.
Key words: Magnetic induction, NMR, Larmor precession, Frequency measurement,
Automatic range changing technology

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