Digital electronic stare quantity converter - designed for approximate determination of standard state number of rated gases

摘要

The standardisation is carried out by multiplication by an integral power of 10, and the state number is determined as content of a counter supplied with a constant frequency during a period Tq. The value of Tq is determined by double integration w.r.t. time as duration of a second integration section limited by zero crossing of the integrator output signal. A constant reference voltage +Uo is applied to the integrator during the first section and during the pressure dependent period Tq, through electronic switch and temperature sensitive resistor. The voltage - Uo is applied to it during the second section through an electronic switch and a fixed resistor.