SU568171A1 - Device for measuring the characteristics of communication lines with correctors - Google Patents

Description

the information input of the second block is the memory, where the output of the block of conversions is connected to the information inputs of the comparison blocks, and the additional output of the adder is connected to the control inputs of the memory blocks; the input of the conversion unit and the output of the adder are respectively input and output of the analog input signal.

The drawing shows a structural electrical circuit of the device.

A device for measuring the characteristics of communication lines with correctors contains j-connected in series generator 1 sawtooth, generator 2 harmonic signal, blank: correctors 3 and receiver 4, the first output of which is connected through the amplitude detector 5 to the first input of the dual-channel indicator 6, and the second output through the phase detector 7 - with the second input of the indicator, the indicator 8 is characteristic, two analyzers 9 and the additional indicator 10 of characteristics, the control to which input is connected to the control input of the indicator torus 8 and to the output of the generator 1,

The outputs of the analyzers 9 are connected to the information inputs of the corresponding; tive indicators 8,10; the input of the analyzer 9 is connected to the output of the amplitude detector 5, and the input of the analyzer 9 is connected to the output of the phase detector 7,

Each analyzer 9 consists of a conversion unit 11, two comparison blocks 12.13, two memory bays 14.15 and an adder 16, the first input of which is connected to the output of the memory block 14 and to the control input of the comparison block 12. The output of the comparison block 12 connected to the informational input of the memory unit 14, and the second VHGch adder 16 - about the output of the memory unit 15 and with the control input of the comparison unit 13, the output of which is connected to the information input of the memory unit 15, and the output of the conversion unit 11 connected to the information inputs of the comparison blocks 12.13 a to olnitelny output of the adder 16, - with the control inputs of the memory units 14,15 minute Log converting unit 11 and the output of the adder 16 are respectively input and output analyzer 9.

. The device works as follows.

The amplitude modulated signal of the oscillating frequency from generator 2 is fed through a block of correctors 3 to receiver 4. At the output of the amplitude detector (LD) 5, a signal proportional to the amplitude-frequency characteristic is output, and at the output of the phase detector SFD) 7 is proportional to the ratio ;. the rpynnoBOTviy of the delay time of the explored research; communication line with the block of correctors 3.

These signals are fed to the inputs of a two-channel indicator 6, on the oscilloscope screen of which the frequency response is reflected. One way, signals from AD 5 and PD 7 are fed separately to analyzers 9, in each of which the signal proportional to the frequency response is converted into digital form in the transducer unit 11, and then in blurs 12 and 13 is compared with reference signals stored The TSs in memory blocks 14 and 15. One channel (for example, blsh is comparable to 12 and block of parts 14) is intended to select the minimum values of the signal, and the other (comparison block 13 and; memory blocks 15) is al maximum. These signals from memory blocks 14 and 15 are fed to adder 16, where subtraction occurs. As a result, the adders 16 to the corresponding indicators 8, 10 are given signals proportional to the non-uniformity of the frequency characteristics,

In the described device, the accuracy of measurements is measured by the non-uniformity of the frequency characteristics of the pulse several times.

Claims (2)

1. A device for measuring the TVJC characteristics of communication lines with correctors, containing subsequently connected a sawtooth generator, a harmonic signal generator, a block of correctors and a receiver, the first output of which is connected via the amplitude detector to the first input of a two-channel indicator and the second output through a phase the detector is with the second input of a two-indicator indicator, and the indicator is characterized by the fact that, with the aim of higher measurement accuracy, two analyzers and an additional indicator are introduced into it characteristics, the control input of which is connected to the control input of the performance indicator and to the output of the sawtooth generator, while the outputs of the analyzers are connected to the information inputs of the corresponding performance indicators, the input of the first analyzer is connected to the output of the amplitude detector, and phase detector output, p 2. The device according to claim 1, such that the analyzer consists of a blinking transform, two comparison of two memory blocks and an adder, whose input is connected to the output of the first memory block and The first block of comparison is stored, the output is ior-o connected to the information input of the first memory block, and the second input of the adder is connected to the output of the second memory block in the second input of the second block which is connected to the input of the second memory block ti, with the output of the conversion unit associated with information inputs of the comparison units, and the additional output of the adder - with control the inputs of the memory blocks, while the input of the conversion unit and the output of the adder are respectively the input and output of the analyzer. HctOHHmcH information taken into account during the examination; 1. Pegemant Catalog of the company 5v 16 nS, 1974, p. 208-221.