SU1406548A2 - Device for testing meters of extraneous amplitude modulation parameters - Google Patents

Abstract

A device for calibrating parameters of parasitic amplitude modulation parameters, (DAM), for example, a reproduction signal of a magnetic recording equipment, contains an amplifier 10 with adjustable gain, adders 9, 11, a generator of 13 harmonic signals, a switch 12, a voltmeter 14, a master oscillator 1, a divider 2 voltages, divider 3 frequencies, control unit 4, switch 5 of the same-name channels 6-8. The device provides the determination of additional errors of the measured PAM meters. 1 il.

Description

Output

a $

±

If

Tf

ten

12

(L

with

;

oh ate

4i

00

The invention relates to the accumulation of information, namely, devices for calibrating meters of parasitic amplitude modulation (PAM) of the reproduction signal of magnetic recording equipment (AMZ), and is a successor of the invention according to the author. No. 531113.

The purpose of the invention is to provide, Q, determined by the frequency of the signal.

determination of the additional errors of the calibrated PAM meters.

The block diagram of the device shown in the drawing.

The master oscillator 1 is connected to the input of the voltage divider 2 and through a frequency divider 3 to the input of the control unit 4. The outputs of the voltage divider are connected to the signal inputs of the input-to-switch 5 of the same name (first to first, etc.) channels 6, 7, 8, the control inputs of which are connected to the same outputs of the control unit, and the outputs to the same inputs of the main adder 9. The output of the main adder through the amplifier 10 with adjustable gain is connected to one of the inputs of the additional adder 11 other friends input through the switch 12 to the output 13 of the generator of harmonic signals, and output - with a voltmeter 14 and the output device.

The device works as follows.

The master oscillator 1 generates a signal. Whose parameters (often

This shape and amplitude correspond to the parameters of the carrier signal needed to calibrate 11W meters. This signal line is fed to the inputs of voltage dividers 2 and 3 frequencies. The division factor of divider 2 at each output; set so that you can get a series of consecutive discrete values of the FIC envelope with its undistorted transmission,. The division factor of the 3 frequency divider is chosen so that, on the basis of the generator 1 signal, the required discretization step of the carrier signal is obtained. The signal from the output of the divider 3 is fed to a control device, which provides for receiving serial signals that control switch 5. Signals from channels 6–8 receive signals corresponding to

divider 2 voltage output. Channels 6-8 are sequentially switched on by the signals of the control unit 4 and their output signals are delivered to the inputs of the main adder 9. As a result, the output of the adder 9 is a signal whose voltage changes over time intervals

0

5 o

five

0

0

five

Oscillator 1 and divider division ratio of 3 frequencies. The accuracy of the amplitude modulation parameters of the received signal depends on the division factors of the voltage divider 2 and the number of its outputs. This signal is through an IO amplifier with an adjustable gain factor when setting a fixed value of its transmission coefficient and through an adder 11 when it is turned off. - Body 12 is fed to the output of the device and to the input of the PAM meter to determine its basic error and frequency response. To determine the additional error in measuring the PAM due to the change in the voltage of the carrier signal, a corresponding change in the gain of the amplifier 10 is made in the control of the FII voltage with a thermal meter 14 and the response of the PAM meter under test to the effect of the measurements of the FII voltage is determined. To determine the additional error of the PAM meter, due to the additive noise component of the AIS, switch 12 is turned on. The output of the harmonic signal generator 13 is additionally added to the AIS with the help of an additional adder 11. By varying the voltage and frequency of the output signal of the generator 13, the parameters of the additive noise component required for calibration are simulated, and the response to the measured PMA meter is determined. Thus, obtaining complete information on the motorological state of measuring PAM and the possibilities of its application for research and monitoring of the parameters of AMZ is achieved.

Claims (1)

Invention Formula A device for calibration of parameters of parameters of parasitic amplitude modulation according to auth.St. No. 531113, about t-l and so that, in order to determine additional pog313165654 of resolvable gauges, in the input to the output of the main adder, an amplifier with adjustable output is introduced to one of the inputs with a large gain factor, an additional adder, which is a separate adder, a harmonic generator of the other input connected through signals, a switch and a volt-changer with a harmonic-meter generator, an amplifier with a control signal, and an output with a voltmeter and a gain factor connected to the output of the device.