SU530267A1 - Digital phase meter - Google Patents

Description

one

The invention relates to a radio-measuring technique that can be used in the construction of high-accuracy digital phase meters.

It is known a device whose job is to quantize by high-frequency pulses of positive half-waves of input input waves; processing the quantization results in a logic circuit skipping to its output and then to a digital counter

only mismatch and shulsy. Thus, the number of pulses counted by the counter is proportional to the measured phase shift.

However, such a device has a low measurement accuracy. Closest to the invention is a digital phase meter containing a key commutator. high-frequency oscillation generator; The disadvantage of this gd phase meter is the ambiguity of the count when changing the measured phase

s.Biga in the range of 0-360, t-e, the working range is limited to the O-180

The purpose of the invention is the expansion of the range of measured phase shifts.

This is achieved by the fact that the proposed digital phase meter contains two channels, each of which consists of series-connected; key switches and limiting amplifiers, node: with their own conclusions to the subtraction element, common for both channels, both key switches connected to the high-frequency oscillator on the control channel, equipped with four decoders, two chains of consecutively connected logic elements and triggers , connect1: CBonivm inputs through logic elements to the outputs of two parvij decoders ц fourth decoder. At the same time, the decoders are connected via their inputs to direct and reverse BbLxoAaM key switches and to the generator of high-frequency tracks. It is also equipped with a third trigger connected to the third and fourth decoders and logic gates I.

The drawing shows 6pock-; heme of the proposed phase meter.

The digital phase meter consists of key KOhCMyTaTOpoB 1, 2, limiter amplifiers 3, 4 subtraction elements 5, a generator of 6 high-frequency oscillations, decoders 7-1О, logic elements 11, 12, and trigger 13, 14, 15.

Phase meter works as follows.

Sinusoidal voltages with an unknown phase shift arrive at the phase meter inputs. The key switches 1 and 2, under the influence of the voltage from the generator 6, convert the input sinusoidal oscillations into bursts of pulses. These packs and pulses pass through the limiting amplifiers 3 and 4 and go to the subtraction element, at the output of which there appear only pulses w are between the moments of the passage of the input voltages through zero. The number of pulses at the output of a subtraction element is proportional to the measured phase shift, regardless of whether it belongs to the right or left half-plane of possible values.

The definition of the sign is as follows. In the case of a positive sign, the decoder 7 is triggered first. The pulse appearing at its output passes through the open logic element 11 (due to the initial state of the trigger 15) and starts the trigger 13, which indicates the short-term sign of the measured shift. The next breaker triggers the decoder 9, the trigger 15 is thrown, and the logic elements 11 and 12 are closed. The closed logic element AND 12 does not allow the pulse from the output of the decoder 8 to act on the trigger 14. Next, the decoder 10 is triggered and the triggers 13, 14, 15 are reset. In the second period, the process of determining the sign is repeated in the same way,. sign indication is carried out at the frequency of the input signal.

For negative phase shifts, the process of determining the sign differs from that described by changing the order of operation of the decoders 7 and 8. In this case, the decoder 8 works first, then the decoder 9 blocks the possibility of indicating the positive sign when the decoder 7 is activated.

Claims (1)

Invention Formula A digital phase meter containing two channels, each of which consists of series-connected key KoivtMyTators and limiter amplifiers, which are separated by their outputs to the subtraction element common to o6oitx channels, and both key switches are connected via a control channel to a high-frequency oscillator that differs in that, in order to expand the range of measured phase shifts, it is equipped with four decoders, two chains of series-connected logical elements, And, and triggers connected x its inputs via the AND gates to the outputs of the first two. the decoders and the fourth decoder, while the decoders on their inputs are connected to the direct and inverse outputs of the key switches and to the generator of high-frequency oscillations, and also equipped with a third trigger connected to the third and fourth decoders and logic elements I.