一、前言过去的皮氏规均存在热时间常数大且需用薄的材料制造 TDR~* 的缺点。对此,本文作了改进,采用一个简单而新型的双运算放大器电路,将皮氏规的惠斯登电桥做成自动平衡的,并将压力计做成恒温的。改进后的系统不仅保持了原先装置的耐久性和量程宽的特点,而且依赖于温度的电阻不须用超薄材料制造,在真空中达到了小于30ms 的响应时间常数。在小于 I. PREFACE In the past, there was a defect in the skin test that thermal time constants were large and thin materials were required to make TDR ~ *. In this regard, this article has been improved, using a simple and new dual op amp circuit, the Pewter’s Wheatstone bridge made automatically balanced, and the pressure gauge made of constant temperature. The improved system not only maintains the durability and wide range of the original device, but also depends on the temperature of the resistance does not require the use of ultra-thin materials, reached a vacuum response time constant of less than 30ms. In less than