PL57782B1

PL57782B1 -

Info

Publication number: PL57782B1
Application number: PL117912A
Authority: PL
Inventors: inz. Stefan Dotryw mgr
Original assignee: Glówny Urzad Telekomunikacji Miedzymiastowejwarszawa
Filing date: 1966-12-10
Publication date: 1969-06-25

Description

Bramka 5 laczy generator 4 impulsów wzorco¬ wych o stabilizowanym okresie powtarzania z licz¬ nikiem 6 impulsów elektrycznych, zliczajacym te impulsy. 45 Z bramka 5 jest równiez polaczone wyjscie komparatora 2, z którego w momencie zrównania napiecia generatora 1 wzorcowego napiecia od¬ niesienia z napieciem pochodzacym ze zródla na¬ piecia mierzonego 3 przychodzi impuls zamykajacy 50 bramke 5 i konczacy zliczanie impulsów. Po skon¬ czonym cyklu pomiaru jego cyfrowy wynik jest zarejestrowany w liczniku dekadowym. O do¬ kladnosci pomiaru decyduje przyjety przyrost poziomu napiecia Uwz(t), przypadajacy na jeden 55 zliczony impuls. Pojemnosc licznika jest odpo¬ wiednia dla wymaganego zakresu pomiarowego i przyjetej ilosci cyfr znaczacych.Dla pomiaru poziomu napiecia w zakresie wyz¬ szym od poziomu napiecia odniesienia NO stosuje 60 sie odmiane urzadzenia wedlug wynalazku. Do¬ konuje sie wówczas pomiaru czasu, w ci^feu któ¬ rego odpowiednio wyzsze, wykladniczo zmienia¬ jace sie napiecie Uwz(t) zmaleje od poziomu rów¬ nego poziomowi mierzonemu Ux do poziomu 65 napiecia odniesienia NO. Jest to pokazane na fig. 3. Moment zrównania napiecia wzorcowego Uwz(t) z napieciem mierzonym Ux jest okreslony w komparatorze 2, którego wyjscie steruje otwar¬ ciem bramki 5. Moment zrównania Uwz(t) z na¬ pieciem odniesienia NO jest okreslony w dodat¬ kowym komparatorze 2a, posiadajacym wbudo¬ wane zródlo napiecia odniesienia NO. Wyjscie tego komparatora steruje zamknieciem bramki.Tak okreslony czas tx otwarcia bramki 5 spelnia zaleznosc: -V* ux uxe = Uo» ™Jli tj = t In —, a wiec jest równiez proporcjonalny do poziomu napiecia Ux wyrazonego w skali neperów. PLThe gate 5 connects the standard pulse generator 4 with a stabilized repetition period to an electrical pulse counter 6 that counts these pulses. The gate 5 is also connected to the output of the comparator 2, from which, when the voltage of the reference generator 1 of the reference voltage is equalized with the voltage coming from the source of the voltage measured 3, a pulse arrives that closes the gate 5 and ends the counting of pulses. After the measurement cycle is over, its digital result is registered in the decade counter. The accuracy of the measurement is determined by the assumed increase in the voltage level Uwz (t) per one counted pulse. The capacity of the counter is adequate for the required measuring range and the assumed number of significant digits. For the measurement of the voltage level in the range higher than the reference voltage NO, 60 different devices according to the invention are used. A time is then measured during which a correspondingly higher, exponentially varying voltage Uwz (t) will decrease from the level equal to the measured level Ux to the level 65 of the reference voltage NO. It is shown in Fig. 3. The moment of equalization of the reference voltage Uwz (t) with the measured voltage Ux is defined in comparator 2, the output of which controls the opening of the gate 5. The moment of equalization of Uwz (t) with the reference voltage NO is defined in an additional comparator 2a having a built-in NO reference voltage source. The output of this comparator controls the closing of the gate. The time tx defined in this way for opening the gate 5 fulfills the relationship: -V * ux uxe = Uo »™ Jli tj = t In -, so it is also proportional to the voltage level Ux expressed in the scale of nepers. PL

Claims

Claims 1. The method of digital measurement and recording of the voltage level on the scale of nepers, especially the voltage level in telecommunication links, characterized by the fact that the time is measured during which the standard, interpretably changing voltage (Uwz (t ) will decrease from the voltage level (kU0) to a value proportional to the voltage measured (kUx), or from the level equal to the measured level (Ux) to the reference level (UQ), the time is measured by counting and recording reference pulses with a stabilized and so selected repetition period - in relation to the exponential rate of the model voltage change (Uwz (t), that after each counted pulse, the instantaneous value of the reference voltage (Uwz (t) is lower by a unit of the voltage level, for example by 1 cN.

2. Device for applying the method according to claim 1 for a voltage level not greater than the reference voltage, characterized by the fact that it has a generator (4) of standard pulses with a stable repetition period and an electrically connected gate (5) through which these pulses pass, and its output a meter (6) of electric pulses, the gate (5) being connected to the output of the generator (1) of the reference reference voltage and the "comparator (2) to which the voltage of this generator (1) of the reference reference voltage and the voltage of this generator (1) is connected to ¬ from the source of the measured voltage (3).

3. A device modification for implementing the method according to claim 1, 1 for a voltage level greater than the reference voltage, characterized in that it has an additional comparator (2a) with an integrated reference voltage source (UQ = NO), a reference pulse generator (4) with a stabilized repetition period and an electrically connected gate (5), through which these pulses pass, and a counter (6) of electric pulses on its output, the gate (5) being connected to the output of an additional voltage comparator (2a), on which the output gene is connected Tator (1) of the reference reference voltage, and is connected to the voltage comparator (2), to the two inputs of which the voltage of this generator (1) of the reference reference voltage is applied and the voltage measured from the source of the measured voltage (3) . FalKI. 21 e, 36/01 57 782 MKP G 01 r i 1 \ V L H "? I 2a i ^ '! -¦¦"? ^ c —r- - t- ^? ~ 3 6 Fiy.2 i Ux 1 l IV: - 1 Uuz (t) X i # 6 r -: i Uo! i-t u FL Krak 1, issue 217 V. 69 280 PL