SU525898A1 - Device for automatic measurement of parameters of amplitude-frequency characteristics of a quadrupole - Google Patents

Description

An input circuit, an attenuator control circuit, a digital-controlled attenuator, and a comparison circuit, in addition, serially connected comparator of the frequency-guided marks and .tugksss are connected to another output of the input device. cue valve, another input of which is connected to you;: one of the comparison circuit and control} zhodokch of the conversion circuit, and the output from the attenuator control, the output of the digital-controlled attenuator is connected to the output of the output signal detector, the second input of the circuit Comparison, to the output of the attenuator control circuit - an indicator, and to the output of the recalculation circuit - the input of the frequency tag comparator.

The drawing shows the structural electrical circuit of the proposed device.

The device contains a oscillating frequency generator 1 (GCCH), a quadrupole 2 under test, detectors 3 and 4 of the output and input signals, a quadruple circuit 2, respectively, a shaper of 5 electronic frequency scale pulses, a recalculation circuit 6, digital attenuator 7, an attenuator control circuit 8 7, a circuit 9 for comparing two, for example, a logic gate 10, an indicator 11, a comparator 12 codes, an input device 13. The device works in the following way. 30 The signal from the generator 1 output is connected to the inputs of test quadripole 2, detector 4 and driver 5. From the output of the measured quadrupole 2 signal, CTjiiaeT to detector 3 of the output signal. The device operates in different: 3x modes separately, taking into account that the quadrupole 2 is measured has a transmission coefficient (-f 1- For circuits K h 1 it is necessary to swap the detectors 3 and 4. Measurement of the passband parameters corresponding to the required level of measurement is set to a digitally adjustable attenuator 7 using the code dialed in the input device 13, through the attenuator control cxefviy 8. At the output of the comparison circuit 9, the voltage corresponding to the logical unit is obtained only when the frequency of the hopper frequency 1 is within the bandwidth of the measured quadrupole. This voltage is fed to the input of the scaling circuit to set the speed of counting the frequency mark pulses in such a way that their number is proportional to either the difference between the lower or upper bandwidth limiting frequency and the specified reference frequency, either iLijpHHe bandwidth, or the difference between the center frequency of the passband and the specified reference frequency.

In order to indicate the bandwidth parameters in real values of the frequency of the infor-spy, it is turned on the indicator 11.

The accuracy of the measurement of the bandwidth parameters in a wide dynamic range of transfer coefficients of the test fourfold of an osnik is determined by the operating range of the input voltage of the digital-controlled attenuator and the comparison circuit. The known circuits have a dynamic range of cjiuecTBeHHo wider than the division schemes of two time-varying voltages. This leads to an increase in the measurement accuracy in the proposed device in comparison with the prototype.

Claims (2)

Measurement of transmission coefficient at specified frequencies. In this mode, the frequency code from the input device is fed to one input of the code comparator, the other input of which receives the code from the counter output to the scaling circuit. At the moment when the codes are equal at the inputs of the code comparator, a pulse appears at its output, which opens the logic gate closing the feedback circuit in the circuit containing the digital-controlled attenuator, the attenuator control circuit, the comparison circuit and forming the essentially digital ratio meter of two voltages ; eny. The attenuator control circuit implements a bit balancing algorithm, with each balancing step associated with one turn of the oscillator frequency 1. Thus, the circuit balances the voltages at the inputs of the comparison circuit at the moment when the oscillator frequency 1 is equal to the one specified in the input device 13. At the end of the balancing process, the code at the output of the attenuator control circuit corresponds to the desired transmission coefficient of the measured quadrupole at a given frequency. This code goes to indicator 11. The counter is reset synchronously at the beginning of each cycle of the sweep frequency generator. Measurement of maximum coefficient 4: | transmit factor. This mode differs from the previous one only in that the logic gate 10 is always open and balancing ocyin.ec- is maximized. It is not difficult to introduce a visual indication unit with electronic sightings of frequency and transmission coefficient, which can be programmed from the input device, into the circuit of the device being calibrated. The proposed device allows to significantly reduce the number of manual operations in the measurement process, improve the measurement accuracy and expand the capabilities of the device with a relatively small additional implementation costs. In addition, the proposed meter allows the results to be recorded on a digital printing machine and can be used in measuring complexes controlled from an electronic computer. Apparatus of the Invention A device for automatically measuring the parameters of the quadrupole amplitude-frequency characteristics, comprising a oscillating frequency generator, to the output of which an output signal detector, an input signal detector and a serially connected frequency generator and electronic frequency scale pulses are connected, a recalculation circuit and an indicator differing from that, in order to improve the measurement accuracy at given frequencies, serially connected input devices are introduced into it, an attenuator, a digitally-controlled attenuator and a comparison circuit, with a serially connected frequency tag comparator and a logic gate connected to another input of the input device, the other input of which is connected to the output of the comparison circuit and the control input of the scaling circuit, and the output with an attenuator control circuit , the output of the detector of the output signal is connected to the input of the digital-controlled attenuator, to the output of the detector of the input signal - the second input of the comparison circuit, to the output of the control circuit of the attenuator - ind locator and output scaling circuit -k - input of comparator frequency tags. Sources of information taken into account in the examination: 1. USSR author's certificate number 286052, M. Kl, St 01 T 23/14, 1970. 2. USSR author's certificate number 437964, M. Cl. G 01 I 29/00, 1973.