TI中文支持网Part Number:MSP430FR5043
在如下链接的文档中，说明了扫频均是通过峰值幅度的50%来确定F1和F2频率，通过图像可以看出峰值幅度大约是1100，那么为什么最终选择的F1和F2频率点峰值一个是600多，另一个是300。不是描述说的50%。
www.ti.com.cn/…/slau824.pdf
Ben Qin：
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参考下工程师的回复：
In the figure 18, it is a method to roughly determine the F1 and F2 selected range. You also need to adjust the F1 F2 frequency for the final configuration. Based on the description in the document.
"Please note that after the initial evaluation is complete, for further system optimization and production, there should be at least two sweeps conducted: one at -35°C and one at 55°C. F1 should then be set around the 6dB from peak at 55°C. The frequency response is expected to shift to the left (lower frequency) at 55C. At -35°C, the frequency response is expected to shift to the right (higher frequency). F2 should be set to ~15kHz greater than the 6dB point for this sweep. The additional 15kHz of excitation is used to reduce the ring down of the transducer. If the transducer still has significant ring down excitation, F2 should be increased further. Also, the choice of -35°C and 55°C depends on the gas meter requirements."
