SU1674012A1 - Method for checking up generators having built-in check and adjustment devices by using generalized video pulse edge length - Google Patents

Abstract

The invention relates to electrical measurement methods and can be used to monitor generators having an integrated frequency meter and a universal voltmeter, as well as built-in means for adjusting the bias voltage of a signal level. The purpose of the invention is to reduce hardware costs and simplify the control of generators by the fact that after measuring the amplitude of pulses U _M in a static mode of operation of a controlled generator, the average value of the signal voltage U _M and the average value of voltage U ₂ elements of the monitored signal exceeding half the level are additionally measured. the amplitudes of the monitored signal, measure the pulse repetition frequency F of the monitored signal and calculate the sought value of the generalized duration of the fronts T _f according to the formula T _f @ = 2 / FU _M (U ₁ - 2U ₂ ). 2 Il.

Description

The invention relates to an electrical measurement technique and can be used to monitor generators having an integrated frequency meter and a universal voltmeter, as well as built-in means for adjusting the bias voltage of a signal level.

The aim of the invention is to reduce hardware costs and simplify the control of generators.

Figure 1 shows time diagrams that explain the method (a is a controlled pulse sequence; b — auxiliary constructions that explain the method for measuring the generalized duration of fronts); figure 2 - structural diagram of the device that implements the proposed method.

The method is based on measuring the generalized duration of the pulse fronts and proceeds from the following representations. Denote by 02 the generalized duty cycle of the elements of the monitored signal exceeding the level of half of the amplitude (Fig. 16), and Qi is the generalized duty cycle of the elements of the monitored signal between the zero level and the level of half of the amplitude (Fig. 16). Then, based on the known relationship between amplitude, average voltage value, and the duty cycle of a periodic sequence.

XI o

Yu

the efficiency of rectangular pulses, we obtain

Um

Q2

Ql

2Ч

0)

Um

2 (U1 - U2) (2)

From consideration of FIG. 16 it is obvious that for an isosceles trapezoid

1f0 L -12. . (3)

Given that, by definition, the duty cycle 1

G1

T2

FQ1 1

FQ2 Get

2p p Ui - 2U2

Un

(4) (5)

. (6)

A formula for determining the generalized duration of pulse fronts.

To implement the method, it is necessary: to measure the average value of the signal voltage (Ui); measure the amplitude of the pulses (Um) of the monitored signal in the static mode of the generator (in the absence of generation); measure the average voltage of the elements (Ua) of the monitored signal exceeding the level of half the amplitude of the pulses of the monitored signal; measure the pulse repetition rate of the monitored signal (F); calculate the desired value of the generalized duration of the fronts (1f) by the formula (6).

The measuring device for implementing the method contains a monitored generator unit 1 (without built-in control means) a unipolar voltmeter 2 of average voltage, an electron-counting frequency meter 3.

The output of the device 1 is connected to the inputs of a voltmeter 2 and frequency meter 3 connected in parallel with each other. The combination of elements 1-3 forms a generator with built-in controls.

The device works as follows.

The voltage of the signal from the generator 1 output goes to the inputs of the built-in measuring devices (voltmeter 2 and frequency meter 3).

First, the operator measures the average

the voltage value of the monitored signal of the generator 1 by a voltmeter 2. Then it measures the amplitude of the pulses of the monitored signal in a static

the mode of operation of the generator 1 (as the average value of the voltage in the absence of generation by the voltmeter 2). After that, the operator sets the signal bias voltage equal to half the measured pulse amplitude on the scale of voltmeter 2, switches generator 1 to the dynamic mode of operation, and measures the average voltage of the monitored signal elements exceeding the level of half the pulse amplitude (combined with zero offset voltage half amplitude), a voltmeter 2.

The operator then measures the frequency.

signal repetition using frequency counter 3 and calculates the desired value of the generalized duration by the formula (6).

thirty

Claims (1)

Invention Formula A method of controlling generators having built-in controls and adjustments according to the generalized duration of video pulses fronts, including measuring the amplitude of pulses Um in a static mode of operation of a controlled oscillator, characterized in that, for the sake of simplicity, the average voltage value Ui and average the voltage U2 of the elements of the monitored signal, exceeding the level of half the amplitude of the pulses of the monitored signal, measure the pulse repetition rate of the monitored signal F and determine the desired value of the generalized length of the fronts by the formula U; 1-202) yy Vm at yk 2 , And Hhtvtm  .