SU624176A1 - Measuring two-phase generator - Google Patents

Description

I

The invention relates to a phase-measuring technique and can be used to create measuring two-phase generators with a wide frequency range.

Two-phase measuring generators are known, a phase-generating device based on trigger scaling circuits with a pulse generator at their input, a device for setting a code for reproducible phase shifts, and blocks forming output harmonic signals in the reference and secondary channels, respectively, l. This known device has a low reliability in the range of infra-low frequencies. Of the known devices, the closest to the invention in its technical nature is a measuring two-phase generator containing a counting device, whose input is connected to a pulse generator, and the outputs are connected to the inputs of the reference channel 4onic signal, the code-phase sensor and the driver of the harmonic signal of the master channel. 2. The process of establishing a phase shift in a known device takes

time equal to one or two periods of the output signal, which corresponds to a frequency of 16-33 minutes. The phase shift is confirmed in each period of the output signal, and a random malfunction is excluded only in the next one after the set period. Since the duration of the period of the output signal can be significant (in the frequency range from 1 s to 20 minutes or more), the probability of an accidental failure, due to interference and other factors, is high, which leads to

6 device malfunction in the specified range. .

The aim of the invention is to reduce the time to establish the phase

about shift. In the proposed generator, this is achieved by the fact that it is equipped with a multi-bit full su | the mater whose single inputs are connected to the outputs of the counting device, others are connected to the bit outputs of the sensor of the phase shift code, and the outputs of the multi-bit full adder are the inputs of the driver of the harmonic signal of the driving channel.

The drawing shows a structural electrical circuit of the proposed generator.

It contains a pulse generator 1, the output of which is connected to the counting input of the counting device 2. The outputs of the counting device 2 are connected to the inputs of the shaper 3 of the harmonic signal of the reference channel. In addition, the outputs of the counting device 2 are connected to the first summing inputs of the multi-bit full adder 4, the second summing inputs of which are connected to the bit outputs of the sensor 5 of the phase shift code and the output of the multi-bit full adder to the inputs of the driver of the harmonic signal of the master channel.

The output pulses of the generator i are fed to the scaler 2, according to the output signals of which the shaper 3 of the harmonic signal generates the output voltage of the reference channel. In addition, the parallel code taken from the nei of the counter 2 and changing with each period of the pulse signal of the generator I is summed with a static parallel code from the sensor 5 of the phase shift code, in the adder 4, the output of which shaper 6 harmonic signal is formed the output voltage setting the channel

For proper operation of the device, it is necessary to choose the number of bits of the adder 4, equal to the number of bits of the counting device. The reproducible IP phase shifts can take on the values of F.K-EbOLL,

Gzhe M - division factor of the conversion device 2;

K 0,1,2, ..., M -1.

In the proposed device, the time to establish the phase shift is almost equal to the time of the code set (one-time shift, i.e. equal to 2-3 s. J) Thus, the use of the proposed device ensures reliable reproduction of phase shifts in the range of ultra-low frequencies, as well as significantly em and simplifies the process of checking various phase metering equipment.

Claims (2)

1. Author's certificate of the USSR 434332, cl. q 01 R 25/00, 1974. 2. Authors certificate of the USSR 464864, cl. Q 01 T 25/00, 1975.