Construction of a Constant Temperature Bath with a Resolution 10^-5°C for Zener Diode Type Reference Voltage

Abstract

This paper proposes a constant temperature bath suitable for improving the performance of the zener diode type reference voltage previously presented. The bath consists of a double-layered Cu-box, which reveals the following distinctive features: (i) The temperature resolution belowes to the level of 10^-5°C; (ii) the fluctuation width is smaller than 5×10-⁵°C (p-p) and (iii) the steady state error remains within 8.6× 10-⁵°C even if the temperature in the outer box varies by 5.9°C. This bath affirms the reference voltage of sevenfigures resolution.