SU1041953A1 - Phasometer checking device - Google Patents

Abstract

A METHOD FOR TESTING PHASOMETERS by measuring phase shifts between output phase and amplitude signals of two synchronized phase- to-phase calibrators; Threat, characterized in that, with, the purpose of determining the error due to waveform argues, set the frequency of the output signal of the first phase phase selector to a multiple of an integer number of times the frequency of the output signal of the second phase calibrator in accordance with the required number of the input harmonic and its amplitude and phase shift and then summed up in pairs, the output signals of the reference channel of the first phase calibrator and the channel with the adjustable phase of the second phase calibrator AND the output signals of the channels of the adjustable phase of both kg-ramps phase and use the received signals in conjunction with the output signals of the phase calibrators as test meters for the phase to be turned, and the magnitude of the error in (L, the waveform distortions are determined by the difference in the readings of the phase meter at the given amplitude / phase and harmonic frequency and its reading zero amplitude input harmonics.

Description

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: The invention relates to electrical measurements and can be used to calibrate phase meters of a field of harmonic signals. There is a known method for determining the error of phase meters by determining the difference in the results of measuring the error of the phase meter from the phase shift at zero and additional phase shift between the signals of a two-phase generator. Kali orator phase l. This method of phase meter calibration provides a high accuracy of determining the basic error, but does not allow one to estimate the effect of waveform distortions on the phase meter measurement error. There is also known a method for calibrating phase meters by measuring the phase shifts between the output phase and amplitude controlled signals of two synchronized calibrator phases and the subsequent processing of measurement results according to a specific algorithm 2. The disadvantage of this method is the impossibility of determining the error of phase meters due to the distortion of the forks of the signals. The purpose of the invention is to determine the error of phase meters due to the distortion of the waveform. The goal is achieved by the method of phase meter calibration based on measuring the phase shift between the output amplitude and phase-controlled signals of two synchronized phase calibrators / sets the output frequency of the first phase calibrator to an integer multiple of the frequency of the output signal of the second phase calibrator according to With the required number, enter the harmonics and set its amplitude and phase shift, and then sum-up the output signals of the reference channel of the first phase calibrator and The phase-controlled second phase calibrator and the output signal of the adjustable phase channels of both phase calibrators use the received signals together with the output signals of both phase calibrators as test signals for the phase meter being tested, and the error values due to waveform distortions are judged by the difference indications of the phase meter at given amplitude, phase, and harmonic frequency values and its indication at a zero value of the amplitude of the inputted harmonics. The drawing shows a block diagram of one of the possible options for the implementation of the proposed method. 53 The block diagram contains interconnected first and second synthesizers 1 and 2 frequencies, associated with them first and second calibrators of phase 3 and 4, respectively, start-up element 5, connected to both phase calibrators, and first and second analog adders 6 -and 7, connected to the corresponding outputs of calibrators 3 and 4 phases. According to the proposed method, two calibration modes of phase meters are possible in order to determine the error due to waveform distortions. In the first mode of distortion, the signal is fed only to one input of the phase meter being turned on, in the second mode, distorted signals are sent to both inputs of the phase meter. In the first mode, the phase meter input is connected to the output 8 of the reference., The channel of the second calibrator 4 phase and the output 9 of the second analog adder 7, in the second case, the phase meter inputs are connected to 10 and 9, respectively, the first and second analog sum: tori b and 7. The phase meter calibration process the first mode is as follows. Using the second synthesizer 2 frequency and frequency control of the second 4-phase selector, set the frequency of the output signal of this calibrator, which determines the frequency of the first harmonic of the test signal. This is a swing with. Output 8 of the reference channel of the second phase calibrator 4 is fed to the first input of the phase meter being turned. Then, using the first frequency synthesizer 1 and the frequency controls of the first phase calibrator 3, set the frequency of the output signal of the IT calibrator to a multiple of an integer number of times the frequency of the output signal of the second calibrator 4 phases, which corresponds to the frequency of the desired harmonic. Using the controls of the amplitude and phase of the output signal of the first 3 phase calibrator, set its required amplitude and phase shift and feed the output signals from the reference channel (output 13) and the adjustable phase channel (output 12) of the first calibrator, 3 phases to the first inputs of the first and first the second analog adders b and 7. Their inputs provide the output signal from the channel of the controlled phase (output 11} of the second 4 phase calibrator. As a result, the outputs of the first and second analog adders 6 and 7 receive complex test Signals that represent the sum of the first and any of the higher harmonics with adjustable and calibrated amplitude and phase shift. The output signal of the second analog sum-Fora 7 (output 9) is fed to the second input of the calibrated phase meter. Phase Ratio Amplitude and Phase: Harmonic Shift, as well as their Frequency. The phase meter error, defined as the difference between phase meter readings at. missing and entered harmonics.

In the second mode, when the phase meter is connected to the outputs 10 and 9 of the analog U coders ad 7 and 7, distorted signals act on both of its inputs, and the phase shift of the harmonics of these signals can be controlled independently using the phase control elements of the first and second calibrators 3 and 4 phases.

By varying the frequency of the harmonics, the amplitude and phase shifts determine

phase meter error in the second mode (also with respect to the measurement result in the absence of harmonics). .

To synchronize the initial STATUS of calibrators 3 and 4 phases: they are started simultaneously using the common start element 5.

The basic accuracy of a calibrated phase meter for undistorted signals

0 is determined from the output signals of the phase calibrators in accordance with known methods.

Thus, due to the introduction of new operations and the technical

5 means is achieved by expanding the functionality of the method by determining the error of the phase meters due to distortion .. waveforms. With this accuracy

Verification value 0 is determined by the accuracy of setting the amplitudes and harmonic phases, which is quite high for the known phase calibrators.

Claims (1)

METHOD OF PHASOMETERS VERIFICATION by measuring phase shifts between the output signals of phase synchronized and amplitude signals of two synchronized phase calibrators, characterized in that, in order to determine the error due to distortion of the waveforms, the frequency of the output signal of the first phase calibrator is an integer multiple of the frequency of the output the signal of the second phase calibrator in accordance with the required number of the input harmonic and set its amplitude and phase shift, and then sum in pairs, the output signals of the reference channel of the first phase calibrator and. channels with an adjustable phase of the second phase calibrator and the output signals of the channels of the adjustable phase of both phase calibrators and use the received signals together with the output signals of the phase calibrators as test signals for the verified phase meter, and the error due to distortion of the waveform is determined by the difference in the phase meter readings for given the values of the amplitude / phase and frequency of the harmonic and its readings at zero value of the amplitude of the introduced harmonic. ТТбТНЛ