SU1372232A1 - Stroboscopic oscillograph scanning calibrator - Google Patents

Abstract

The invention relates to a radio measuring technic and can be used in stroboscopic oscillography. The purpose of the invention is to increase the repetition frequency and stability of the calibration signals, as well as to extend the functionality of the calibrator, which contains reference oscillator 1, multiplier 2, current control unit 3, controlled a current source 4, a gig-generator 5, a mixer 6, a differential frequency converter 7, a differential frequency amplifier 8 and a detuning sign determinant 9. In order to eliminate the possible frequency offset YIG oscillator 5 the device is provided a ring-locked loop YIG oscillator 5.Opredelenie detuning plate is synchronous with the block 3 upravle- audio signal current supplied by the determinant detuning plate. 1 il. I (L

Description

The invention relates to a radio measuring technique and can be used in a stroboscopic oscillography,

The purpose of the invention is to increase the repetition rate and stability of the calibration signals, as well as to expand the functionality of the sweep calibrator of the stroboscopic oscilloscope.

The drawing shows a block diagram of the proposed device.

The stroboscopic oscilloscope sweep calibrator contains a reference oscillator 1 (OG multiplier 2, current control unit 3 (BUT), a controlled current source 4 (UIT), a zig-generator 5, a mixer 6, a differential frequency converter 7 (PRC), a force - a differential frequency generator 8 and a detuning mark identifier 9 (ORZ). Current control unit 3, controlled current source 4, gig-generator 5, alternator

the pickup 6, the differential frequency amplifier 8, the detuning sign qualifier 9 and the differential frequency converter 7 are connected in series, the output of the reference generator 1 under

It is connected to the stroboscopic sweep and to the input of the multiplier 2, the output of which is connected to the second input of the mixer 6, the output of the amplifier 8 of the differential frequency is connected to the first input of the converter 7 of the differential frequency, the output of which is connected to the second input of the controlled current source 4, the second output The current control unit 3 is connected to the second input of the decoupler sign 9, the output of the zig-generator 5 is connected to the -stroscopic converter.

The device works as follows.

It is known that a gig generator is an autogenerator, the output signal parameters of which are determined by a gig filter. In turn, the parameters of the gig filter included in the gig generator 5 are determined by the parameters of the current flowing through the control winding. Thus, the characteristic of the gig-generator 5 is the dependence

F f (I),

50

five

50

five

0

five

where F is the signal repetition frequency

zig-generator 5; I -, control current.

Modern lig-oscillators have a frequency tuning of the output signal of 1.5-2 octaves in the range of up to 20 Hz. The operator, using the current control unit 3, acting on the first input of the controlled current source 4, sets the required frequency of the output signal of the oscillator 5, which is fed to the input of the stroboscopic converter for the purpose of calibration.

In this case, the output signal F, fed from the output of G1 to the input of the stroboscopic sweep, is synchronizing, in connection with which a synchronous image of the calibration signal is observed on the screen of the calibrated stroboscopic oscilloscope. However, due to various destabilizing factors, such as temperature, humidity, the repetition rate of the output signal of the oscillator 5 differs from that required for calibration. In order to eliminate the possible frequency drift of the lig-generator 5, the device is provided with an auto-tuning ring of the lig-generator 5.

The output signal of the gig-generator 5 is fed to the first input of the mixer 6, the second input of which receives the output signal of the multiplier 2. Multiplier 2 is a harmonic generator implemented on a nonlinear element. It is a charge-accumulating diode (DDS) located in a microstrip line. The spectrum of its output signal, which has a clearly pronounced line structure, consists of the harmonics of the signal of the reference oscillator 1, arriving at its input. The mixer 6 operates in the mode of the pulse-phase detector.

The difference frequency at the mixer output is a consequence of both the positive and negative detuning of the frequency of the zig-generator 5 relative to the harmonic. To determine the mismatch sign, a determinant 9 of the mismatch mark is entered into the proposed device, the first input of which is supplied with a differential frequency signal, and the second is synchronized

The second output signal of BOOT 3. The function of the detuning sign 9 determiner is tracking the difference frequency that changes during the operation of the self-tuning ring under the influence of the output signal of the difference frequency converter 7 fed to the second input of the controlled current source 4. If the detuning frequency of the converter of the differential frequency converter 7 increases, the determiner 9 of the detuning symbol outputs to the second input of the differential frequency converter 7 a signal, under the influence of which the polarity of the RFP 7 output signal changes to the opposite. If the differential frequency decreases, ORZ 9 does not change the polarity of the output of the CSP signal 7. The detuning sign is detected synchronously with the BUT 3 signal arriving at the second input of the ORZ 9.

Claims (1)

Invention Formula A calibrator of a stroboscopic oscilloscope sweep containing a stable frequency grid driver, the output of which is connected to the first input of the mixer, the second input 0 0 five five Q which is connected to the generator, and the output to the input of a differential frequency amplifier, whose input is connected to the input of a frequency discriminator, the output of which is connected to a control element whose output is connected to a control input of the generator, characterized in that increasing the stability of calibration signals, the frequency discriminator consists of a differential frequency converter and a detuning sign determinant, the control element is designed as a series connected The current control unit and the controlled current source, the stable frequency grid driver are made in the form of serially connected reference oscillator and multiplier, and the generator is a zig-generator, with the difference frequency transformer being connected to one input of the detuning sign detector by another input the output of the detuning sign detector, the other input of which is connected to the output of the current control unit, and the output of the differential frequency converter is the output of the frequency discriminator.