FIELD: measurement and control technology. SUBSTANCE: losses resistance is periodically introduced in active zone of sensor. Additionally inductance coil is introduced in active zone of inductive sensor of approach and periodically they make and brake coil's ends. Frequency of coil's commutation, that corresponds to unstable operation of sensor, is taken as maximum frequency of operation of sensor. EFFECT: simplification of method to determine maximum frequency of operation of inductive sensor of approach. 1 dwg
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