SU453647A1 - DIGITAL INFRARED FREQUENCY WIDEBAND PHASOMETER OF INSTANT VALUES - Google Patents

Description

one

The invention relates to a phase-measuring technique.

A digital infra-low-frequency wideband instantaneous value phase meter is known that contains an instantaneous phase shift converter between input voltages and input voltage periods at time intervals, two integrators, zero-organ, counter, reference frequency generator, reference voltage source, keys, control unit .

The disadvantage of this phase meter is a relatively large error, which is caused by analog memory.

The aim of the invention is to improve the accuracy of the phase meter.

This is achieved by the fact that the proposed phase meter is equipped with code-resistance, code-voltage and memory registers, the code-resistance converter being turned on through an automatic switch, controlling, and its input connected to one of the outputs of the phase and period converter time, and the input, providing the neutral position of the switch, with a control unit connected to both outputs of the phase and period converters at time intervals, the code-resistance converter is connected between and integrator, and outputs a code-converter voltage and a reference voltage source connected with its other output to the code converter-voltage and included in the output counter register

memory whose discharge outputs are connected to the control inputs of the code-resistance and code-voltage converters.

The drawing shows a block diagram of the phase meter described, consisting of a converter 1 of instantaneous values of phase shift between input voltages and a period of input voltages at time intervals, control unit 2, automatic switch 3, two-pole source 4

reference voltage, code-voltage converter 5, code-resistance converter 6, integrator 7, zero-body 8, memory register 9, counter 10, key 11, generator 12 of the reference frequency.

Phase meter works as follows in two cycles.

In the first cycle, the pulses from converter 1 enter the control unit 2, which opens the key 11 for a time T equal to

input period. This time interval is measured by filling it with pulses of frequency / o from reference generator 12, the number of which is LT 7 o is counted by counter 10; 6 and code-voltage 5, where, respectively, 1B resistance equal to A ,, is converted. -Ro and voltage equal to L .. t / o.

In the second cycle, the phase shift between the input voltages is determined by the double integration method. For this, an automatic switch 3 connects a code-resistance converter to the output of source 4 of the reference voltage Yao. In this position, the automatic switch 3 is in the DG time, proportional to the phase shift, determined by the duration of the output pulse of the converter. potential for key 11.

In this position, the automatic switch 3 remains until the output voltage I from the integrator 7 becomes equal to the bullet, which is fixed by the null organ 8, which through the control unit 2 transfers the automatic switch 3 to the neutral position and locks the key 11, which was open for time 7y. This time can be determined from the charge balance equation:

AT.v ..

g,

one

U1

one

r, -Ro J N g Co adt 0

 Uo- Tu v

Lt - “o N..Ro

Lgd .. lg.

T

Lt 7.v / o

time Tu. measured by pulse quantization from reference generator 12,

which are counted by counter 10. The digital count of counter 10 is:

H- .- / o- Sf.,. V is proportional to the phase shift f

; Xi

does not depend on frequency. The use of code-impedance, voltage-code, digital memory converters, and a double integration method reduces the phase meter error and reduces the number of integrators.

Subject invention

Digital infra-low-frequency broadband phase meter of instantaneous values, containing an instantaneous converter of phase shifts between input voltages and periods of input voltages at time intervals, an integrator connected to a zero-body, a reference frequency generator via a switch connected to the counter , keys, control unit, characterized in that, in order to increase accuracy, it is equipped with code-resistance, code-voltage converters, memory register and automatic switch, When in use, the inverter resistance code- enabled via an automatic switch, a control input coupled to one output transducer phase and period in time intervals, and

the input providing the neutral position of the switch - with a control unit connected to the wallpaper. I outputs the phase and period converter in time intervals, the code-resistance converter is switched on

between the integrators and the outputs of the code-voltage converter and the source of the reference voltage, which is connected to a code-voltage converter by another output, and the output of the counter is connected to the register.m

the memory outputs of which are connected to the control inputs of the code-resistance and count voltage converters.