RU200528U1 - DEVICE FOR MEASURING SIGNAL PARAMETERS IN THREE-PROGRAM WIRED BROADCASTING NETWORKS - Google Patents

Abstract

The utility model relates to the field of measuring technology, namely to devices for measuring signal parameters in three-program wire broadcasting networks, containing a switch of measured parameters connected through high-pass filters, a low-pass filter with a speaker, a signal detector and an indicator and can be used to control the level signals on the programs of three-program wire broadcasting directly during installation and other works. According to the utility model, the switch of the measured parameters is made in the form of the first switch of the subscriber line and the distribution feeder line and which, in the position of the distribution feeder line, is connected to the input of the signal limiting module of the distribution feeder line, the output of which is connected to the position of the first switch in the position of the subscriber line passing and to the second a low-pass / high-pass switch, which in the low-pass position is connected to the input of the low-pass filter of the first program, and in the high-pass position is connected to the third switch between the input of the band-pass high-pass filter of the second program and the input of the band-pass high-pass filter of the third program, when the third switch is synchronous and connected to the fourth switch, which is connected to the outputs of the band-pass high-pass filter of the second program and the band-pass high-pass filter of the third program, and its output is a solid switch is connected to the output of the low-pass filter of the first program and is connected to the speaker, which includes a signal detector, and through a switch with an indicator. The technical result achieved is to enable the device to operate without a power source. 1 wp f-ly, 2y.

Description

The technical field to which the utility model belongs.

The utility model relates to the field of measuring technology, namely to devices for measuring signal parameters in three-program wire broadcasting networks, containing a switch of measured parameters connected through high-pass filters, a low-pass filter with a speaker, a signal detector and an indicator and can be used to control the level signals on the programs of three-program wire broadcasting directly during installation and other works.

In this work, the following terms and abbreviations are used:

TPV - three-program broadcasting

SPV - wire broadcasting networks

AL - subscriber line

RFL - distribution feeder line

LF - low frequencies

HF - high frequencies

CEA - electronic equipment

State of the art.

At present, electricians have the opportunity to monitor the signal level according to the TPV programs directly during installation and other work on the SPV using a measuring device of the ITPV-3 type (indicator), and to carry out acoustic monitoring using a standard subscriber receiver adapted to receive signals from the distribution feeder and adapted to work with an autonomous power supply from built-in power elements (batteries).

The indicator and receiver are heavy, bulky, require special care in handling, easily damaged devices and constant replacement of the batteries. Their performance directly depends on the ambient temperature (at low temperatures the batteries are quickly discharged), and the receiver, in principle, is not intended for use at negative temperatures. The foregoing leads to the fact that electricians often do not use the existing meter and receiver in their work, limiting themselves to current clamps operating only according to the 1st program, which, in turn, can adversely affect the quality of the wire broadcasting services provided by the enterprise.

At present, various devices are known for measuring signal parameters in three-program wire broadcasting networks, for example, a device containing a switch of measured parameters connected through high-pass filters, a low-pass filter with a sound control unit and an indicator, for example, the one described in the application for patent for invention No. 2005101948/28, dated 27.01.2005, published 10.07.2006),

This device is the closest in technical essence to the claimed utility model and is taken as a prototype for the proposed utility model. The disadvantage of this device is the obligatory operation from a power source.

Disclosure of the utility model.

Based on this original observation, the present utility model mainly aims to propose a device for measuring signal parameters in three-program wire broadcasting networks, containing a switch of measured parameters connected through high-pass filters, a low-pass filter with a speaker, a signal detector and an indicator, which allows both at least to smooth out the above disadvantage, namely, to ensure the possibility of the device operating without a power source, which is the technical task of this utility model.

To achieve this goal, the switch of the measured parameters is made in the form of the first switch of the subscriber line and the distribution feeder line and which in the position of the distribution feeder line is connected to the input of the signal limiting module of the distribution feeder line, the output of which is connected to the position of the first switch in the position of the subscriber line passing and with a second switch for low frequencies and high frequencies, which in the low pass position is connected to the input of the low pass filter of the first program, and in the position of high pass is connected to the third switch between the input of the band pass high pass filter of the second program and the input of the band pass high pass filter of the third program, the third switch is synchronous and connected to the fourth switch connected to the outputs of the band-pass high-pass filter of the second program and the band-pass high-pass filter of the third program, and its output is a solid switch is connected to the output of the low-pass filter of the first program and is connected to the speaker, which includes a signal detector and through a switch with an indicator.

Thanks to such advantageous characteristics, it becomes possible to measure the parameters of all networks in the absence of additional power supply.

There is another advantageous embodiment of the utility model, in which the indicator is made in the form of a small-sized dial indicator.

Thanks to this advantageous characteristic, it becomes possible to implement a specific device.

The set of essential features of the proposed utility model is unknown from the prior art for devices of a similar purpose, which allows us to conclude that the criterion of "novelty" is met for the utility model.

Brief description of the drawings.

Other distinctive features and advantages of the utility model clearly follow from the description given below by way of illustration and not being limiting, with reference to the attached drawing in which:

- Figure 1 schematically depicts a functional diagram of a device for measuring signal parameters in three-program wire broadcasting networks, according to the utility model.

- Figure 2 schematically depicts the external view of a device for measuring signal parameters in three-program wire broadcasting networks, according to the utility model.

According to Figures 1 and 2, a device for measuring signal parameters in three-program wire broadcasting networks contains a switch of measured parameters located in housing 1, connected through bandpass filters 2 and 3 of high frequencies, a low-pass filter 4 with speaker 5 and indicator 6.

Inside the speaker 5 there is a detector 51, which provides signal demodulation.

The switch of the measured parameters is made in the form of the first switch 7 between the subscriber line and the distribution feeder line, which in the position of the distribution feeder line is connected to the input of the signal limiting module 8 of the distribution feeder line, the output of which is connected to the position of the first switch in the position of the subscriber line and to the second switch 9 bass and treble.

The second switch 9 in the low pass position is connected to the input of the low pass filter 4 of the first program, and in the high pass position is connected to the third switch 10 between the input of the high pass band filter 2 of the second program and the input of the high pass band filter 3 of the third program, while the third switch 10 is synchronous and connected to the fourth switch 11, connected to the outputs of the high pass band filter 2 of the second program and the high pass band filter 3 of the third program, and its output the fourth switch 11 is connected to the output of the low pass filter 4 of the first program and is connected to the speaker 5 and through switch 12 with indicator 6.

Demodulation of the signal in the speaker 5 is performed by the detector 51.

Indicator 6 can be made in the form of a small-sized pointer-type indicator.

The device input for network connection is marked as 13.

Implementation of the utility model.

A device for measuring signal parameters in three-program wire broadcasting networks works as follows.

The device is connected via terminals 13 to the network.

Signal parameters are measured on different lines, for which switch 7, choosing the RFL or AL line, and with switches 9 and 10 switching:

- the first program, (switch position 9 in the LF position),

- the second program (the position of the switch 9 in the HF position, and the switch 10 in the 78 position),

- the third program (the position of the switch 9 in the HF position, and the switch 10 in the 120 position).

The numbers 78 and 120 correspond to frequencies of 78 and 120 KHz, respectively.

For sound control, the device is applied to the ear with the speaker holes 5, and the dial indicator 6 is turned off with the button 12.

The voltage is measured when a speech or music signal is applied to the input of the device. The value of the signal is determined by the maximum mark that the arrow has reached at least once in a certain time interval. (When a signal from a generator is applied to the input of the device, the reading is overestimated compared to the actual value (by about 2 dB at a frequency of 1000 Hz).

Industrial applicability.

A device for measuring the parameters of signals in three-program wire broadcasting networks can be implemented by a specialist in practice and, when implemented, ensures the implementation of the declared purpose. The possibility of implementation in practice follows from the fact that for each feature included in the formula of a utility model based on the description, a material equivalent is known, which allows us to conclude that the criterion "industrial applicability" for the utility model and the criterion "completeness of disclosure" for the utility model are met.

In accordance with the proposed solution, the applicants manufactured a prototype device for measuring signal parameters in three-program wire broadcasting networks.

The device was made in a plastic case for electronic equipment with dimensions 120x60x30 mm.

On the front panel of the case, at the top, there were 3 toggle switches in order from left to right:

- switch of the "RFL / AL" operating mode;

- program switch "LF / HF";

- program selector 78/120.

A dial indicator was placed on the front surface of the case in the middle part.

A speaker was placed on the front surface of the case at the bottom.

On the upper end of the case there were sockets for connecting two single-pole plugs.

The acoustic control button "AK" was located on the side end of the case.

The voltage was measured when a speech or music signal was applied to the input of the device. The magnitude of the signal was determined by the maximum mark reached by the arrow at least once in some time interval.

Scale graduation.

The scale has been calibrated in decibels (dB).

Correspondence tables dB and B:

1st program 2nd and 3rd programs

Scale RFL mode AL mode Scale RFL mode AL mode +3 dB 170 in 21 in +3 dB 42 in 4.3V 0 dB 120V 15 in 0 dB 30 in 3 in -3 dB 84 in 10.6V -3 dB 21 in 10 in -5-7 dB 60 in 7-8V -5-7 dB 15 in 1.5V -10 dB 40 in 5 in -10 dB 10 in 1 in -20 dB 12 in 1.5V -20 d B 3 in 0.3 in

Using an acoustic control device.

To implement sound control, it was necessary to press the button 12 on the body 1 of the device. To increase the volume when listening to the signal on the RFL, the device could be temporarily switched to the "AL" mode.

In total, the device, as shown by tests, provides:

1) indicator measurement of the quasi-peak voltage level with a small-sized pointer-type indicator:

A) signal of the 1st program (AF):

- in the "RFL" mode from 12 V to 170 V;

- in the "AL" mode from 1.5 V to 21 V

B) signals of the 2nd and 3rd HF programs (78 and 120 KHz, respectively)

- in the "RFL" mode from 3 V to 42.5 V,

- in the "AL" mode from 0.3 V to 4.5 V.

C) sound control of the measured signal to the built-in speaker.

That is, tests of a prototype device for measuring signal parameters in three-program wire broadcasting networks have shown that it becomes possible, due to the above signs, to independently measure signal parameters in three-program wire broadcasting networks. All this, ultimately, ensures the achievement of the achieved technical result - the ability to operate the device without a power source.

In addition, this small-sized device, not only does not require power supply (all circuit elements operate directly from the signals of three SPV programs), but this device is also an indicator-type device intended for use in the field, with a large payload of personnel. The proposed device allows you to measure the voltage of the signal of the 1st program (PC), 2nd and 3rd programs (HF: 78 and 120 KHz) on distribution feeder lines (RFL) and subscriber lines (AL) using a built-in dial indicator , and also to carry out sound control of the measured signal through the built-in speaker. The proposed device is designed to operate at an ambient temperature of - 25 to 50 degrees C.

The proposed device is indispensable for troubleshooting wired broadcasting lines.

Claims (2)

1. A device for measuring signal parameters in three-program wire broadcasting networks containing a switch of measured parameters connected through high-pass filters, a low-pass filter with a speaker, a signal detector and an indicator, characterized in that the switch of the measured parameters is made in the form of the first switch of the subscriber line and of the distribution feeder line and which in the position of the distribution feeder line is connected to the input of the signal limiting module of the distribution feeder line, the output of which is connected to the position of the first switch in the position of the subscriber line and to the second switch of low frequencies and high frequencies, which is connected in the position of low frequencies with the input of the low-pass filter of the first program, and in the high-pass position is connected to the third switch between the input of the band-pass high-pass filter of the second program and the input of the band-pass high-pass filter of the third program, while the third switch is synchronous and connected to the fourth switch, connected to the outputs of the band-pass high-pass filter of the second program and the band-pass high-pass filter of the third program, and its output is the fourth switch is connected to the output of the low-pass filter of the first program and is connected to the speaker into itself a signal detector, and through a switch with an indicator. 2. The device according to claim 1, characterized in that the indicator is made in the form of a small-sized dial indicator.

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