SU477369A1 - Electromechanical coupling coefficient meter - Google Patents

Description

8 to the PLL 4, and switches the circuit to be measured 2 so that the additional controlled oscillator 8 is tuned by the PLL 4 through the installation and fixing unit of the frequency 7 to the core resonance frequency. Setting and fixing the frequency can be effected, for example, by electromechanical means. After installing the additional controlled oscillator 8 at the resonance frequency, the error signal on the PLL 4 is reduced to zero, after which the automatic switching of generation modes 5 turns off the additional controlled oscillator 8, connects the controlled oscillator 1 to the PLL 4 and switches the measured circuit 2 for setting the controlled oscillator 1 pa the frequency of the apresonance of the core. From controlled oscillators 1 and 8, signals with a frequency of resonance and antiresonance of cores are fed to the mix. The carrier 9, from the output of which a signal with a frequency / ap-fp is taken, and a frequency divider 10, which also receives a signal with a frequency fp. Frequency divider 10, for example, on trigger counting decades, performs frequencies / p to difference frequency / ar- / p at the output of the frequency divider

10 pulses are obtained, the number of which per unit of time is determined by the ratio

. Next, the resulting sequence

/ ar - / p

pulses fed to the measuring unit

11 performed, for example, on the basis of the converter, the number of pulses-voltage and the meter itself. A pulse to voltage converter provides a constant voltage at the output proportional to the number of input pulses. The constant voltage is applied to the device calibrated in units of / North.

Subject invention

An electromechanical coupling coefficient meter containing a measuring unit, a serially connected controlled oscillator, a measured circuit and a phase locked loop, the first output of the KOTOpoio is connected to a controlled oscillator, the second output is connected to the measured circuit via an automatic switching of the generation modes, characterized by that, in order to automate and increase the measurement accuracy, a unit for setting and fixing the frequency, an additional controlled oscillator, a mixer, are introduced into it,

a frequency divider, the third output of the phase locked loop of the frequency unit being connected in series through the unit for setting and fixing the frequency and the additional controlled generator is simultaneously connected to

the measured circuit, the frequency divider and the mixer, the second input of which is connected to the second output of the controlled heater, and the output of the mixer through the frequency divider is connected to the measuring unit.