Gas Filled Devices
Gas filled tubes and neon lamps have also been used as voltage references, primarily in tube-based equipment, as the voltage needed to sustain the gas discharge is comparatively constant. For example, the popular RCA 991 "Voltage regulator tube" is an NE-16 neon lamp which fires at 87 Volts and then holds 48–67 Volts across the discharge path.
Read more about this topic: Voltage Reference
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