PHASE METER WITH HETERODYNE CONVERSION OF FREQUENCY Russian patent published in 2013 - IPC G01R25/00 

FIELD: measurement equipment.

SUBSTANCE: phase meter comprises the first input for the first signal equipped with the first analogue-digital converter, and the second input for the second signal, equipped with the second analogue-digital converter, identical to the first one, a time-setting device and a device of data collection and processing, at the same time the time-setting device with its output is connected to inputs of each analogue-digital converter and the device of data collection and processing, it also comprises identical first and second channels of signal processing, every of which comprises four serially connected registers, two subtractors and two summators with coefficients, the input of the first register in each channel is the input of the channel and is connected with the output of the appropriate analogue-digital converter, outputs of both summators with coefficients are outputs of channels and are connected with inputs of the device of data collection and processing, and their inputs are connected with outputs of each subtractor of its channel, inputs of the first subtractors of each channel are connected to the outputs of the first and third registers of this channel, and inputs of the second subtractors - with outputs of the second and fourth registers of this channel.

EFFECT: increased accuracy of a phase meter when measuring difference of signal phases having high-frequency bearing frequency.

2 cl, 7 dwg