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文中介绍了V—A法测交流磁化曲线的基本原理。为了在逐点测试中省去许多H.B的中间计算,而采用了两只合成膜电位器来实现H.B的直读。其原理是:将H=0.4N_1/D·VH/R_HO_6变成H=K_H·V_H的形式;将B=V_B/4fN_2S·10~8G变成B=K_BV_B的形式;然后各用一只电位来分压,使H与V_H,B与V_B有简单对应的数量关系,如1mV代表1mO_6或10G。文中列举了一个中Ni磁弹合金的测试,还列出了H.B直读数据的情况。作者认为,这种方法的优点是:1.省时、省事;2.与采用带刻度盘的多圈电位器相比,本方法既经济,(若用FDC-2型传声放大器来测量电压,仪器的输入端本身就一只合成膜电位器),而误差也较小(取决定于电压表本身的精度)。3.可以实现等B测量。作者对合成膜电位器的频率特性进行了研究,试验证明,f≤3KHz时,这种电位器是完全满足测试要求的。
The paper introduces the basic principle of AC-magnetization curve measured by V-A method. To eliminate many of the intermediate calculations of H.B in point-by-point tests, two synthetic membrane potentiometers were used to achieve direct reading of H.B. The principle is to change H = 0.4N_1 / D · VH / R_HO_6 to H = K_H · V_H, B = V_B / 4fN_2S · 10 to 8G to B = K_BV_B, and then use a potential Partial pressure, so that H and V_H, B and V_B have a simple corresponding quantitative relationship, such as 1mV represents 1mO_6 or 10G. The article lists a test of Ni magnetic alloy, but also lists the case of direct reading H.B data. The author believes that the advantages of this method are: 1. Saving time and saving energy 2. This method is economical compared to using a multi-turn potentiometer with a dial (using a FDC-2 type transponder to measure the voltage , The instrument’s input itself is a composite membrane potentiometer), and the error is small (depending on the accuracy of the voltmeter itself). Can achieve B measurement. The author of the frequency characteristics of the synthetic membrane potentiometer were studied, the test proved that, f ≤ 3KHz, this potentiometer is fully meet the test requirements.