Heat filament with a constant current. Measure filament temperature with thermocouple. Gas molecules collide with and cool the filament. Voltage increases to keep filament at constant current. Atm to 10-4 Torr Fast, simple, inexpensive.
Heat filament with a constant current.Measure filament temperature with thermocouple.Gas molecules collide with and cool the filament.Voltage increases to keep filament at constant current.Atm to 10-4 TorrFast, simple, inexpensive.