SU718801A1 - Method of measuring amplitude-phase error of phase meters - Google Patents

Description

 one

The invention relates to a radio measuring technique and can be used when calibrating phase meters.

A known method for measuring the amplitude-phase error of a phase meter by measuring the phase difference between the input and output signals of the phase-shifting divider 1.

The disadvantage of it is low measurement accuracy.

There is also known a method for determining the amplitude-phase error of a phase meter from the difference in the readings of a phase meter being checked after two measurements of the phase difference between the input and output signals of the attenuator, 2.

The disadvantage of this method is low accuracy.

In order to improve accuracy in the method of measuring the amplitude-phase error of phase meters by determining it from the difference in readings of the phase meter being checked after two measurements of the phase difference between the input and output signals of the attenuator, in the first measurement these signals are differentiated, the second is integrated, and the signal taken from the input attenuator, differentiate (integrate) with a time constant of 1 / co, where "is the frequency at which the research is carried out, and the signal taken from its output differentiate (integrate) with a constant oh time 1 / Ksh, where / C is the point of amplitude-phase characteristic under investigation

phase meter

The drawing shows a block diagram of a device that implements the proposed method for measuring the amplitude-phase error of a phase meter, where a 1-auxiliary attenuator with an attenuation coefficient K (1 + / (2) / 2).

When the position of the switches 2, 3, indicated on the drawing (C-circuit in differentiation mode), a) 1, 1 (

K, you can write

1 i (t

P - and

 Y2

1 // (+ f + arctg / O,

./

m m t ugda FA - phase shift introduced by auxiliary attenuator 1.

From the above expressions it is clear that, and the phase difference between them

  -fA- arctg / r.

Then the first reading of the phase meter 4

01 - - - cf.- arctg / C +%,

four

Claims (1)

Claim A method for measuring the amplitude-phase error of phase meters by determining it from the difference in the readings of the verified phase meter after two measurements of the phase difference between the input and output signals of the attenuator, characterized in that, in order to improve accuracy, these signals are differentiated in the first measurement and integrated in the second, the signal taken from the input of the attenuator are differentiated (integrated) with the time constant l / ω, where ω is the frequency at which studies are conducted, and the signal taken from its output is differentiated (integ iruyut) with a time constant 1 / Αω, where K - point investigated amplitudnofazovoy phasemeter characteristics ..