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本文介绍北大无线电系与无线电工厂研制的ＤＬ－７（ＺＪ－１２）型宽量程超高真空电离计管，采用Ｂ－Ａ式结构，玻璃外壳，测量范围为 １０－２－ ５ × １０－１０托。
This article introduces the DL-7 (ZJ-12) wide-range ultra-high vacuum ionization gauge tube developed by radio department and radio factory of Beijing University. It adopts B-A type structure and glass shell with the measuring range of 10-2-5 × 10-10 Care