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对于传统的Ｂ－Ａ规来说，当压强高于１０－３托时，随着压强的升高，离子收集极电流便显示出明显的非线性。人们认为，这是因流向灯丝的离子流变得与灯丝发出的电子流相差不多而引起的。在本文所述的新型规管中，灯丝附近设置了一个辅助电极，其电位保持低于灯丝电位，用以消除这种不希望有的离子流。经这样一改，其线性区域便延展至１０－１托（对于Ｎ２），但并不牺牲其灵敏度。对电极结构和电位等电极设计参数所进行的最佳化研究表明，设有接地半圆筒状电极的规管将具有最佳的性能，这种新型Ｂ－Ａ规能在 １０－１０至２× １０－１托压强范围内具有线性的“离子流－压强”特性。
With the conventional B-A gauge, the ion collector current shows a significant non-linearity as pressure increases above 10-3 torr. It is believed that this is caused by the fact that the flow of ions to the filament becomes comparable to the flow of electrons emitted by the filament. In the new regulatory regime described herein, an auxiliary electrode is positioned adjacent the filament at a potential below the filament potential to eliminate this undesirable ion flux. With this change, the linear region is extended to 10-1 Torr (for N2) without sacrificing its sensitivity. Optimization studies on electrode design and potential equalization electrode design parameters have shown that a gauge with a grounded semicylindrical electrode will provide the best performance. The new B-A gauge is available in 10-10 to 2 x The linear “ion current-pressure” characteristic is within 10-1 Torr.