Analyzing and experimental results show that a fairly wide range of oscillation frequency can be controlled by a single grounded resistor.
理论分析和实验结果表明：只需调节一个接地的电阻，振荡频率可调范围相当宽；
It was necessary to calculate the range of the braking resistor.
并对制动电阻的选择范围进行了估算。
Otherwise, for this range needs to find the reference resistor with a different value of resistance.
否则，这个范围需要找到一个不同的电阻值的参考电阻。
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