Impedance/frequency characteristics of glow-discharge reference tubes

The impedance/frequency characteristics of some cold-cathode glow-discharge tubes over the frequency range 300c/s-5 Mc/s have been obtained. The results are shown to agree with an extended form of theory by van Geel. Impedance measurements indicate that there are several delayed effects in the glow discharge which affect the low-frequency impedance characteristics considerably. Tentative suggestions about the origin of these effects are discussed and the influence of some tube parameters on the magnitudes of the consequent delay times are indicated. The equivalent circuit of the glow-discharge tube is determined from the results.