ELECTRONIC MOISTURE GAGE Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: device has measurement autogeneration transducer having amplifier incorporated into a positive feedback circuit with frequency- setting circuit connected to the transducer, frequency standard having amplifier with frequency-setting circuit in the positive feedback circuit, measuring autogeneration transducer and frequency standard frequency comparison unit and measuring instrument. Device also has two rectifying transducers with an adder between them and indication unit connected to the adder output. The transducers are connected with the measuring autogeneration transducer and frequency standard, respectively, where frequency independent bridge with thermoresistor is used in one of the shoulders between the amplifier and frequency- setting circuit in each frequency standard assembly. Each rectifying transducer is connected to the positive feedback circuit between the frequency independent bridge and frequency setting circuit in the measuring autogeneration transducer and frequency standard, respectively. EFFECT: enhanced accuracy of measurements. 2 cl, 1 dwg