SU1453335A1 - Device for forming complex harmonic signal with pre-set coefficient of harmonics - Google Patents

Abstract

The invention relates to a radio metering technique and can be used in equipment for checking nonlinear distortion meters. The invention is to simplify and expand the functionality of the device. The device contains a generator of 1 sinusoidal signals, a block of 2 adjustable distortions, a detector of 3 average values, an attenuator 4, a comparator of 5 voltages and a detector of 7 root-mean-square values. The introduction of block 6 subtraction and the formation of new functional links excludes complex, frequency tunable, highly selective blocks. In addition, the range of harmonic values of the output signal is expanded at a given accuracy. 1 il.

Description

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The invention relates to a radio metering technique and can be used in apparatus for calibrating nonlinear distortion meters.

The aim of the invention is to simplify and extend the functionality.

The drawing shows a block diagram of a device for generating a Q complex harmonic signal with a given harmonic coefficient.

The device contains a generator of 1 sinusoidal signals (GSS), the output

Uoer uon -o,

uJK,)

It is fed to the input of a comparator of 5 voltages, to another input of which a constant voltage is applied to the normal 4 attenuator 4 from the detector output 3 average values

and, k, and | k, and „, W

where cd is the attribution factor of the attenuator

(JJHil y-si siuP - -.. A-r V- at y t-111 which is combined with the input of block 2 is drinking to the control input of block 2

adjustable distortion and detector input 3 average values. The output of the detector is 3 average values through a successively connected attenuator 4 and a comparator 5 of the voltage of the connection to the control input of the block 2 of the adjustable distortion, the output of which is the output of the device connected through a series-connected detector 7 rms-r-: 25 values and a subtraction unit b to the second input of comparator 5 -. strings, and the average detector output 3 is combined with the second input of subtraction unit 6 .30

The device works as follows.

The sinusoidal signal of the first harmonic from the output of the GSS 1 is fed to the input of the adjustable distortion block 2 (a diode limiter or a field effect transistor), in which deterministically distorted, and the distorted signal is fed to the output of the device.

 An initial sinusoidal signal with an amplitude and "using a detector of 3 average values is placed at a constant voltage equal to

and I. (one

and the output signal of the device, by the detector, of 7 root-mean-square values, at a constant voltage equal to

and ,, K,, (2)

where K is the conversion factor of the block 2 of adjustable distortions, depending on the value of Kp;

K - harmonic ratio of the output signal. - 55

adjustable distortion, determined from the expression

, -Uo6,

Un, | (K, -n) 35

Expression (5) allows tabulation of Kg for the corresponding values of Kp.

The advantages of the device are in the absence of complex tunable high-selective blocks in its composition and the extension of the range of values of the K output signal for a given accuracy.

Claims (1)

Invention Formula A device for forming a layered harmonic signal with a given harmonic coefficient, containing a generator of sinusoidal signals, the output of which is connected to the device's stroke through an adjustable distortion unit and through a series-connected average value detector, an attenuator and a voltage comparator connected to the control input of the unit adjustable distortion as well as a rms detector, a value that distinguishes 45 50 so that, in order to simplify and extend the functionality, a subtraction unit is introduced into it, the first input of which is connected via the device output through the detector of mean square values, the second input is connected with the attenuator during the course, and you of the subtraction unit are connected to the second input of the voltage comparator4 Received Constant Stresses and Ujjn are subtracted in subtraction block 6, and a difference signal equal to and about Uoer uon -o, uJK,)) supplied to the input of a comparator of 5 voltages, to another input of which a constant voltage from the detector output of 3 average values is fed normalized by the attenuator 4 and, k, and | k, and „, W where cd is the attenuator transfer coefficient 4. The error signal U, from the output of the voltage comparator 5, which is connected to the control input of unit 2 fooler on control input of block 2 adjustable distortion, determined from the expression , -Uo6, Un, | (K, -n) (5) Expression (5) allows tabulation of Kg for the corresponding values of Kp. The advantages of the device are the absence in its composition of complex highly tunable highly selective blocks and the expansion of the range of values of K for the output signal with a given accuracy. 35 Invention Formula five A device for generating a complex harmonic signal with a given harmonic coefficient, containing a sinusoidal signal generator, the output of which is connected to the device output and through series-connected average values detector, attenuator and voltage comparator connected to the control input of the adjustable distortion unit as well as a rms detector, different values five 0 In order to simplify and expand the functionality, a subtraction unit is inserted into it, the first input of which is connected to the device output via the RMS detector, the second input is combined with the attenuator stroke, and the output of the subtraction unit is connected to the second input of the comparator Zheniy4