HEAT CONDUCTANCE VACUUM GAUGE WITH MEASURING CELL, MEASURING INSTRUMENT AND CONNECTING CABLE

摘要

The invention relates to a process for operating a controlled heat conductance vacuum gauge with a measuring cell (18) comprising a Wheatstone bridge (1) with supply voltage (12, 13) and measurement voltage (14, 15) terminals, a power supply and measuring instrument (21) and a connecting cable (19) containing several conductors, and to a circuit therefor; in order to prevent errors of measurement caused by connecting cables (19) of different lengths and to automate cable length equalization it is proposed that the voltage of a power supply terminal (12, 13) of the Wheatstone bridge (1) in the measuring cell (18) be recorded without current via one (26) of the conductors of the connecting cable (19) and taken into account in the formation of the measurement value.