PHASE METER WITH HETERODYNE FREQUENCY CONVERSION Russian patent published in 2012 - IPC G01R25/00 G01R29/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment and may be used in radio engineering, metrology and other industries for precision measurement of phase difference of pairs of signals, and its variation in time. A phase meter with heterodyne conversion of frequency comprises a time-setting facility, the first and second identical analogue to digital converters, a facility for data collection and processing, besides, the time-setting facility is connected to the data collection and processing facility and each analogue to digital converter, which comprises the first digital multiplier and the second digital multiplier connected to the first analogue to digital converter, and also the third digital multiplier and the fourth digital multiplier connected with the second analogue to digital multiplier, connected to the second analogue to digital converter, the first digital conveyor low pass filter, connected with the first digital multiplier, the second conveyor low pass filter, connected with the second digital multiplier, the third digital conveyor low pass filter connected to the third digital multiplier, the fourth digital conveyor low pass filter connected to the fourth digital multiplier, at the same time each digital conveyor low pass filter is also connected to the facility of data collection and processing, and the time setting facility is connected to the first digital multiplier and the third digital multiplier.

EFFECT: higher accuracy of a phase meter in measurement of phase difference of signals having high-frequency carrier frequency.

2 cl, 2 dwg