A new electronic circuit for a hot-cathode ionization gauge

Summary Details are given of a circuit, capable of measuring pressures in the range 10⁻³ mm Hg to 10⁻¹⁰ mm Hg. As the quotient of ion current over emission current is measured, which is proportional to the pressure in the above-mentioned range, the need for an emission stabilizer has been eliminated. At pressures lower than 10⁻⁴ mm Hg, meter indication varies by not more than 3% at emission currents between 10μA and 1 mA. The author wishes to thank Prof. Dr. J. Kistemaker for his stimulating interest, and J. Los, H. Zaaiman, C. Visser, R. Wunnink and T. Heise for carrying out many measurements. This work is part of the research program of the Stichting voor Fundamenteel Onderzoek der Materie and was made possible by financial support from the Nederlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek.