APPARATUS FOR MONITORING SECONDARY RESONANCE OF QUARTZ-CRYSTAL RESONATORS Russian patent published in 2015 - IPC G01R27/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio-measurement equipment and can be used in developing and inspecting quartz-crystal resonators and frequency-controlled (modulated) quartz-crystal oscillators. The apparatus consists of the following components: an electronically controlled generator (1), a four-terminal device (2) with a quartz-crystal resonator, a unit (3) for electronic control of the wattles component of the four-terminal device, a frequency multiplier (4), a frequency detector (5), a display (6), a phase modulator (7), an integrator (8), a high-pass filter (9), a low-pass filter (10), an attenuator (11), a modulating square-wave generator (12).

EFFECT: faster determination of secondary resonance of quartz-crystal resonators.

2 dwg