Digital precision thermometer with measuring sensor - converts sensor transmitted current in sawtooth converter in analog part into pulse follower frequency strictly proportional to temp.

摘要

In addition to the measuring sensor the thermometer has an analog part, decimal counters, a control system and a mains adaptor. Within its operational range the current transmitted by the sensor is converted in the analog part by a sawtooth converter, with defined discharge time period, into a temperature proportional follower frequency. Preferably, the sensor transmitted current is inverted in the analog part by a mirror current system, and supplied for an integrator with opposite polarity. A compensation current and a switching current, determining the discharge time period, may be added to the sensor current.