CN111487952B - Multichannel signal switching and coupling device and signal testing system - Google Patents
Multichannel signal switching and coupling device and signal testing system Download PDFInfo
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- CN111487952B CN111487952B CN202010342273.XA CN202010342273A CN111487952B CN 111487952 B CN111487952 B CN 111487952B CN 202010342273 A CN202010342273 A CN 202010342273A CN 111487952 B CN111487952 B CN 111487952B
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0256—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The application discloses a multi-channel signal switching and coupling device and a signal testing system, wherein in the multi-channel signal switching and coupling device, a main control unit, a first switching unit and a public signal bus realize the coupling of a plurality of standard signals to the public signal bus; the main control unit, the common signal bus, the second switching unit, the signal transmission cable and the tested channel connector realize the coupling of the standard signal from the common signal bus to each tested channel, thereby realizing the purpose of transmitting the standard signal from the common signal bus to a specific tested channel; the method is mainly applied to the precision testing process of a multi-channel analog quantity acquisition system, in the process, a signal source for providing standard signals does not need to be manually plugged and pulled by a tester, the wiring position of a signal source output lead wire does not need to be changed, the purpose of providing the standard signals for different tested channels can be achieved through the input of a control command, and the testing efficiency is improved.
Description
Technical Field
The present disclosure relates to the field of signal control technologies, and more particularly, to a multi-channel signal switching and coupling apparatus and a signal testing system.
Background
In a Distributed Control System (DCS) System and a Safety Instrumented System (SIS) System, there are a plurality of analog signals, which include input signals and output signals, and the accuracy of the input signals and the output signals is an extremely important performance index of the Control System, and is one of the important factors for ensuring the production process.
Because a standard signal source is expensive, the precision test of sampling or output channels (hereinafter referred to as "channels to be tested") of various current multi-channel analog quantity acquisition or output devices is mainly to manually operate the standard signal source to output a predetermined signal value according to the test signal value requirement of each channel to be tested manually, manually connect the output line of the standard signal source to the corresponding terminal of the channel to be tested by a manual mode, or directly manually press-connect a gauge pen to the conductive part of the corresponding terminal to connect a test loop, read the corresponding measured value in a system to be tested by a tester, record the measured value, calculate an error and compare the measured value with the error requirement of the channel to be tested, thereby completing the precision test of the signal value point of the channel to be tested; when testing the next channel to be tested, manually removing the output line of the standard signal source from the terminal corresponding to the channel to be tested, and manually transferring and re-accessing the output line to the corresponding terminal of the next channel to be tested; and repeating the steps until all channels to be tested are tested.
It is obvious that, in the prior art, the process of testing the system analog quantity precision mainly depends on that a tester frequently operates a standard signal source to give a standard signal and connects and conducts a test loop, so that the efficiency is low.
Disclosure of Invention
In order to solve the technical problem, the application provides a multi-channel signal switching and coupling device and a signal testing system, so as to achieve the purpose of improving the testing efficiency in the analog quantity precision testing process.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a multi-channel signal switching and coupling apparatus, comprising: the system comprises a main control unit, a first switching unit, a common signal bus, a second switching unit, a signal transmission cable and a tested channel connector; wherein the content of the first and second substances,
the main control unit is used for receiving a control instruction and generating a first signal matrix and a second signal matrix according to the control instruction, wherein the first signal matrix comprises a plurality of first control signals in one-to-one correspondence with the first output ends, the first control signals are high-level signals or low-level signals, the second signal matrix comprises a plurality of second control signals in one-to-one correspondence with the second output ends, the second control signals are high-level signals or low-level signals, the first signal matrix is output through the plurality of first output ends, and the second signal matrix is output through the plurality of second output ends;
the first switching unit comprises a plurality of first relays and a plurality of public signal connecting ends, each first relay comprises two pairs of first normally open contacts, one end of each pair of first normally open contacts is connected with a first input end of the public signal bus, the other end of each pair of first normally open contacts is connected with one public signal connecting end, one end of each other pair of first normally open contacts is connected with a second input end of the public signal bus, the other end of each pair of first normally open contacts is connected with one public signal connecting end, and each first relay is used for receiving a standard signal through the public signal connecting end and closing or opening the first normally open contacts according to the received first control signal;
the second switching unit comprises a plurality of second relays, each second relay comprises two pairs of second normally open contacts, one end of one pair of the second normally open contacts is connected with the first output end of the public signal bus, the other end of each pair of the second normally open contacts is connected with a core wire of the signal transmission cable, one end of the other pair of the second normally open contacts is connected with the second output end of the public signal bus, and the other end of each pair of the second normally open contacts is connected with a core wire of the signal transmission cable;
the signal transmission cable comprises a plurality of core wires for connecting the second relay to one of the channels under test in the channel under test connector through the core wires.
Optionally, the channel under test connector includes a plurality of channels under test, and each channel under test includes at least two test probes.
Optionally, the channel to be tested includes two test probes, and the two test probes are respectively connected to two pairs of second normally open contacts of the second relay.
Optionally, the two second relays are used as a group of test relays, the channel to be tested includes three test probes, two of the three test probes are respectively connected to two pairs of second normally open contacts of one second relay in the group of test relays, and the other test probe is connected to one pair of second normally open contacts of the other second relay in the group of test relays.
Optionally, the three second relays are used as a group of test relays, the channel to be tested includes four test probes, two of the four test probes are respectively connected to two pairs of second normally open contacts of one second relay in a group of test relays, and the other two test probes are respectively connected to another two pairs of second normally open contacts of the other two second relays in a group of test relays.
Optionally, the method further includes: a drive unit;
and the driving unit is used for respectively controlling the power-on/power-off of the coil of the first relay or the second relay after the first control signal and the second control signal are subjected to signal amplification.
Optionally, the driving unit includes a plurality of electronic switching devices, a control end of each electronic switching device is configured to receive the first control signal or the second control signal, and two ends of a switching path of the electronic switching device, a coil of the first relay or the second relay, and a working power supply of the first relay or the second relay form a closed loop.
Optionally, the method further includes: a power supply unit;
the power supply unit is used for receiving an input power supply, processing the input power supply to generate a first power supply and a second power supply, providing the first power supply for the main control unit to serve as a working power supply of the main control unit, and providing the second power supply for the driving unit, the first relay and the second relay to serve as the working power supply of the driving unit, the first relay and the second relay.
Optionally, the common signal bus includes:
a first conductive line and a second conductive line; wherein the content of the first and second substances,
the first conductive line includes a first input and a first output;
the second conductive line includes a second input and a second output.
A signal testing system, comprising: a multi-channel signal switching and coupling device as claimed in any preceding claim.
It can be seen from the foregoing technical solutions that, in the multi-channel signal switching and coupling device, a main control unit, a first switching unit and a common signal bus implement coupling of a standard signal to the common signal bus, and specifically, the main control unit generates a first signal matrix according to a control instruction and transmits the first signal matrix to the first switching unit to control a closed state of a first normally open contact of a first relay in the first switching unit, thereby implementing coupling of the standard signal to the common signal bus; in addition, the main control unit, the common signal bus, the second switching unit, the signal transmission cable and the tested channel connector realize the coupling of standard signals from the common signal bus to each tested channel, specifically, the main control unit generates a second signal matrix according to a control instruction and transmits the second signal matrix to the second switching unit so as to control the closed state of a second normally open contact of a second relay in the second switching unit, thereby realizing the purpose of coupling a plurality of standard signals from the common signal bus to a specific tested channel; the method is mainly applied to the precision testing process of a multi-channel analog quantity acquisition system, in the process, a signal source for providing standard signals does not need to be manually plugged and pulled by a tester, the wiring position of a signal source output lead wire does not need to be changed, the purpose of providing the standard signals for different tested channels can be achieved through the input of a control command, and the testing efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a main control unit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a first switching unit, a common signal bus, a second switching unit, a signal transmission cable, and a tested channel connector according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a main control unit, a power supply unit and a driving unit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a signal testing system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides a multi-channel signal switching and coupling apparatus, as shown in fig. 1 and fig. 2, including: the system comprises a main control unit 10, a first switching unit 20, a common signal bus 30, a second switching unit 40, a signal transmission cable 50 and a tested channel connector 60; wherein the content of the first and second substances,
the main control unit 10 includes an input end, a plurality of first output ends and a plurality of second output ends, the main control unit 10 is configured to receive a control instruction, and generate a first signal matrix and a second signal matrix according to the control instruction, where the first signal matrix includes a plurality of first control signals in one-to-one correspondence with the first output ends, the first control signals are high level signals or low level signals, the second signal matrix includes a plurality of second control signals in one-to-one correspondence with the second output ends, the second control signals are high level signals or low level signals, and the first signal matrix is output through the plurality of first output ends, and the second signal matrix is output through the plurality of second output ends;
in fig. 1, IO1 represents the first output terminal, and IO2 represents the second output terminal; the first relay is denoted 21, for clarity of presentation only the normally open contacts of the first relay are shown in fig. 1, likewise the second relay is denoted 22, and only the normally open contacts of the second relay are shown in fig. 1.
The first switching unit 20 comprises a plurality of first relays 21 and a plurality of common signal connection terminals 22, the first relays 21 comprise two pairs of first normally open contacts, one end of one pair of the first normally open contacts is connected to the first input terminal of the common signal bus 30, the other end of the one pair of the first normally open contacts is connected to one common signal connection terminal 22, one end of the other pair of the first normally open contacts is connected to the second input terminal of the common signal bus 30, and the other end of the other pair of the first normally open contacts is connected to one common signal connection terminal 22, and the first relays 21 are configured to receive a standard signal through the common signal connection terminals 22 and close or open the first normally open contacts according to the received first control signal;
the second switching unit 40 includes a plurality of second relays 41, each second relay 41 includes two pairs of second normally open contacts, one end of each pair of second normally open contacts is connected to the first output end of the common signal bus 30, the other end of each pair of second normally open contacts is connected to one core wire 51 of the signal transmission cable 50, one end of each pair of second normally open contacts is connected to the second output end of the common signal bus 30, and the other end of each pair of second normally open contacts is connected to one core wire 51 of the signal transmission cable 50;
the signal transmission cable 50 includes a plurality of core wires 51 for connecting the second relay 41 to one of the channels under test in the channel under test connector 60 through the core wires 51.
The main control unit 10 may be a single chip microcomputer having a plurality of I/O ports and more than 1 serial interface, where the serial interface may be an RS232 protocol communication interface, an RS485 protocol communication interface, an ethernet communication interface, a bluetooth communication interface, or a WiFi communication interface, and preferably is an RS232 protocol communication interface, and the RS232 protocol communication interface is relatively convenient to implement and has a high cost performance. The serial interface is used for being connected with the upper computer HC and receiving a control instruction transmitted by the upper computer HC. After receiving the control instruction, the main control unit 10 analyzes and processes the control instruction to generate a first signal matrix including a plurality of first control signals and a second signal matrix including a plurality of second control signals, where the first control signals are high-level signals or low-level signals, the second control signals are high-level signals or low-level signals, that is, the first signal matrix is a matrix in which a plurality of high-level signals and low-level signals are arranged in a certain order, and the second signal matrix is a matrix in which a plurality of high-level signals and low-level signals are arranged in a certain order. With reference to equations (1) and (2), equations (1) and (2) show, by way of example, possible configurations of a first signal matrix and a second signal matrix, respectively, where element 1 represents a high level signal and element 0 represents a low level signal;
the high level signals and the low level signals in the first signal matrix and the second signal matrix correspond to the I/O ports of the main control unit 10 one by one, and are transmitted to the first relay 21 or the second relay 41 through the I/O ports corresponding to the high level signals and the low level signals, so that the control of the closed states of the first normally open contact of the first relay 21 and the second normally open contact of the second relay 41 is realized through the change of the high level and the low level signals, the coupling of the standard signals to the common signal bus 30 is controlled according to the closed states of the plurality of first relays 21 in the first switching unit 20, the coupling of the standard signals from the common signal bus 30 to the tested channel is controlled according to the closed states of the plurality of second relays 41 in the second switching unit 40, in the process, a signal source for providing the standard signals does not need to be manually plugged by a tester, and the purpose of providing the standard signals to different tested channels can be realized through the input of a control command, the testing efficiency is improved.
In addition, the number of I/O ports of the master control unit 10 needs to be greater than the number of signal source wiring patterns for providing standard signals + the number of wiring patterns per channel under test × the number of channels under test. For example, the signal source types to be switched include voltage, current, and resistance, where the resistance and the current share one connection mode, and there are 8 channels to be tested, and the channels to be tested have two connection modes, i.e. 2-wire system and 3-wire system, the number of I/O ports of the main control unit 10 should be at least:
the number of signal source connection modes + the number of connection modes of each channel to be tested × the number of channels to be tested is 2+2 × 8, which is 18 ports I/0.
For the implementation manner of the serial interface of the main control unit 10, for example, the serial interface of the single chip microcomputer may implement a communication interface conforming to the RS232 serial communication protocol through a port driver chip such as MAX232 and related components, and be connected to the communication port of the upper computer HC through a serial communication line, and perform communication interaction with the upper computer HC.
In addition, the main control unit 10 needs to have functions of analyzing a control command with a specific format, initializing resources, receiving and sending back a communication command, and the like, and also needs to burn numbers of the first relay 21 and the second relay 41 or corresponding relations between the first relay 21 and the second relay 41 and the I/0 port in advance, so as to control the first relay 21 and the second relay 41 according to the first signal matrix and the second signal matrix.
As for the common signal bus 30, referring to fig. 1, optionally, the common signal bus 30 includes:
a first conductive line 31 and a second conductive line 32; wherein the content of the first and second substances,
the first conductive line 31 comprises a first input and a first output;
the second conductive line 32 includes a second input terminal and a second output terminal.
The first conductive line 31 and the second conductive line 32 may be both copper and silver conductors.
For the first switching unit 20 and the second switching unit 40, the first relay 21 and the second relay 41 are signal relays having two pairs of normally open contacts, and the signal relays have the characteristics that the contact resistance is less than 100m Ω within 10 ten thousand switching lives, and can realize signal switching with low insertion impedance.
For the first relay 21, two pairs of normally open contacts may be named as an a contact and a B contact, respectively, and a pin at one end of the a contact of the first relay 21 forms a good electrical connection (for example, the resistance between pins arbitrarily connected together is less than 100m Ω) through a wire as a first input end of the common signal bus 30; similarly, the pin at the end of the B contact of the first relay 21 is electrically connected to the second input terminal of the common signal bus 30 by a wire, the end of the A, B contact of each first relay 21, which is not connected to the common signal bus 30, is connected to the common signal connection terminal 22 by a wire, and the common signal connection terminal 22 can be connected to a set of 2-wire signal connection ports of a standard signal source or a standard measurement device, and maintains a good electrical connection (e.g. connection resistance < 100m Ω).
For example, a common standard signal source and a standard measuring device are matched with a thermal signal calibrator X319, and there are 3 groups of signal connection ports with 2-wire system, so that 3 groups of first relays 21 need to be arranged in the first switching unit 20, one end of two normally open contact pins of each first relay 21 is connected to 1 group of signal ports of the X319 through a wire, and another section of pins of the normally open contacts are respectively connected to pins at the same positions of the other two first relays 21, and are respectively connected to a first input end and a second input end of the common signal bus 30.
For the second switching unit 40, the second relay 41 is also a signal relay having two pairs of normally open contacts, two normally open contacts of each signal relay are named as A, B contacts, and one end pin of its A, B contact is also connected to the first output end and the second output end of the common signal bus 30, respectively, wherein the first output end of the common signal bus 30 and the first input end of the common signal bus 30 are in an electrically connected relationship, the second output end of the common signal bus 30 and the second input end of the common signal bus 30 are in an electrically connected relationship, and the other end of the A, B contact of the second relay 41 is to be connected to one tested channel of the tested channel connector 60 through a transmission cable.
Optionally, the channel under test connector 60 includes a plurality of channels under test, and each of the channels under test includes at least two test probes 61.
When the wiring mode of the channel to be tested is 2-wire system, the channel to be tested comprises two test probes 61, and the two test probes 61 are respectively connected with two pairs of second normally open contacts of one second relay 41.
When the wiring mode of the tested channel is a 3-wire system, the two second relays 41 are used as a group of test relays, the tested channel comprises three test probes 61, two of the three test probes 61 are respectively connected with two pairs of normally open contacts of one second relay 41 in one group of test relays, and the other test probe 61 is connected with one pair of normally open contacts of the other second relay 41 in one group of test relays.
When the wiring mode of the channel to be tested is 4-wire system, the three second relays 41 are used as a group of test relays, the channel to be tested comprises four test probes 61, two of the four test probes 61 are respectively connected with two pairs of normally open contacts of one second relay 41 in a group of test relays, and the other two test probes 61 are respectively connected with one pair of normally open contacts of the other two second relays 41 in a group of test relays.
Of course, the above description only illustrates one connection method suitable for the channels under test of different wiring methods, and the connection method can be compatible with different wiring methods such as 2-wire system, 3-wire system, and 4-wire system. In an alternative embodiment of the present application, it is also possible to use A, B two second relays 41 when the measured channel is 3-wire system, and A, C two second relays 41 when the measured channel is 4-wire system, wherein the two pairs of second normally open contacts of the a second relays 41 connect the 2-wire system channel and the common signal bus 30; a pair of normally open contacts of the second relay 41B is connected with a tested channel connection wire which is more than that of the 3-wire system and a specified signal wire in the common signal bus 30, a pair of normally open contacts of the second relay 41C is connected with the second relay 41A, and the other end of the normally open contacts of the second relay 41C is used for connecting two more wires which are more than that of the 4-wire system.
On the basis of the above embodiments, in an embodiment of the present application, as shown in fig. 3, the multichannel signal switching and coupling apparatus further includes: a drive unit 70;
the driving unit 70 is configured to amplify the first control signal and the second control signal and then control the power on/off of the coil of the first relay 21 or the second relay 41.
The driving unit 70 is configured to improve the driving capability of the output signal of the main control unit 10, the driving unit may include a plurality of electronic switch devices, each of which has a control end for receiving the first control signal or the second control signal, and two ends of a switch channel of each electronic switch device form a closed loop with the coil of the first relay or the second relay and the working power source of the first relay or the second relay.
The electronic switching device may be a switching element such as a triode or an MOS transistor, and two ends of a switching channel of the electronic switching device may also be referred to as a first end and a second end of the electronic switching device. For example, still referring to fig. 3, the driving unit 70 includes a plurality of transistors, a base of each of the transistors is a control terminal of the transistor, an emitter and a collector of each of the transistors are two terminals of a switching channel of the transistor, which may be referred to as a first terminal and a second terminal of the transistor, respectively, the base of each of the transistors is configured to receive the first control signal or the second control signal, and the collector and the emitter of each of the transistors form a closed loop with a coil of the first relay 21 or the second relay 41 and an operating power supply of the first relay 21 or the second relay 41. When the driving unit 70 is formed of a plurality of transistors, the number of the transistors is the same as the sum of the numbers of the first relay 21 and the second relay 41, that is, each transistor corresponds to one first relay 21 or one second relay 41.
In fig. 3, 21 denotes the first relay, more specifically the coil of the first relay, 22 denotes the second relay, more specifically the coil of the second relay, 72 denotes the transistor, and a resistor 71 cooperating with the transistor is also shown, the resistor 71 being used to bias the transistor 72 in the operating state. In fig. 3, + represents the positive power supply terminal of the power supply unit 80, and-represents the negative power supply terminal of the power supply unit 80.
In other embodiments of the present application, when there are a plurality of transistors/MOS transistors/darlington transistors integrated on a chip, one unit loop corresponds to one first relay 21 or one second relay 41.
Still referring to fig. 2, the multi-channel signal switching and coupling apparatus further includes: a power supply unit 80;
the power supply unit 80 is configured to receive an input power, process the input power to generate a first power and a second power, provide the first power to the main control unit 10 as a working power of the main control unit 10, and provide the second power to the driving unit 70, the first relay 21, and the second relay 41 as the working power of the driving unit 70, the first relay 21, and the second relay 41.
In this embodiment, the power supply unit 80 provides two power supplies (i.e. a first power supply and a second power supply) to the main control unit 10 and the driving unit 70, and the first relay 21 and the second relay 41, respectively, for the purpose of considering the difference between the working power supplies required by the different signal relays and the main control unit 10, and solving the problem of coil driving voltages of different voltage classes; on the other hand, considering that the coil of the relay is an inductive load, the coil is powered on or powered off to affect the power supply to some extent, so that the power supply is divided into two power supplies, a first power supply is provided for the main control unit 10, and a second power supply is provided for the driving unit 70, the first relay 21 and the second relay 41.
Of course, in an embodiment of the present application, when the voltage levels of the operating power supplies required by the main control unit 10 and the first and second relays 21 and 41 are the same, a single power supply may be used to simultaneously supply the main control unit 10, the driving unit 70, the first relay 21, and the second relay 41.
Correspondingly, the embodiment of the present application further provides a signal testing system, referring to fig. 4, the signal testing system includes the multi-channel signal switching and coupling apparatus 100 according to any of the embodiments described above.
In fig. 4, in addition to the multi-channel signal switching and coupling device 100, a standard signal source 400, an upper computer HC, a multi-channel terminal board 200, signal measurement hardware 300, and the like are also shown, wherein a test system and a signal acquisition system are integrated in the upper computer HC, the test system is used for providing a page for a tester to input a control instruction, and the signal acquisition system is used for acquiring an output signal of a channel to be tested.
To sum up, the embodiment of the present application provides a multi-channel signal switching and coupling device and a signal testing system, wherein in the multi-channel signal switching and coupling device, a main control unit, a first switching unit and a common signal bus realize the coupling of a standard signal to the common signal bus, and specifically, the main control unit generates a first signal matrix according to a control instruction and transmits the first signal matrix to the first switching unit to control the closed state of a first normally open contact of a first relay in the first switching unit, so as to realize the coupling of the standard signal to the common signal bus; in addition, the main control unit, the common signal bus, the second switching unit, the signal transmission cable and the tested channel connector realize the coupling of standard signals from the common signal bus to each tested channel, specifically, the main control unit generates a second signal matrix according to a control instruction and transmits the second signal matrix to the second switching unit so as to control the closed state of a second normally open contact of a second relay in the second switching unit, thereby realizing the purpose of coupling a plurality of standard signals from the common signal bus to a specific tested channel; the method is mainly applied to the precision testing process of a multi-channel analog quantity acquisition system, in the process, a signal source for providing standard signals does not need to be manually plugged and pulled by a tester, the wiring position of a signal source output lead wire does not need to be changed, the purpose of providing the standard signals for different tested channels can be achieved through the input of a control command, and the testing efficiency is improved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A multi-channel signal switching and coupling apparatus, comprising: the system comprises a main control unit, a first switching unit, a common signal bus, a second switching unit, a signal transmission cable and a tested channel connector; wherein the content of the first and second substances,
the main control unit is used for receiving a control instruction and generating a first signal matrix and a second signal matrix according to the control instruction, wherein the first signal matrix comprises a plurality of first control signals in one-to-one correspondence with the first output ends, the first control signals are high-level signals or low-level signals, the second signal matrix comprises a plurality of second control signals in one-to-one correspondence with the second output ends, the second control signals are high-level signals or low-level signals, the first signal matrix is output through the plurality of first output ends, and the second signal matrix is output through the plurality of second output ends;
the first switching unit comprises a plurality of first relays and a plurality of public signal connecting ends, each first relay comprises two pairs of first normally open contacts, one end of each pair of first normally open contacts is connected with a first input end of the public signal bus, the other end of each pair of first normally open contacts is connected with one public signal connecting end, one end of each other pair of first normally open contacts is connected with a second input end of the public signal bus, the other end of each pair of first normally open contacts is connected with one public signal connecting end, and each first relay is used for receiving a standard signal through the public signal connecting end and closing or opening the first normally open contacts according to the received first control signal; the common signal bus can convert a signal source with a 2-wire system into a signal with a 3-wire system and a signal with a 4-wire system for output;
the second switching unit comprises a plurality of second relays, each second relay comprises two pairs of second normally open contacts, one end of one pair of the second normally open contacts is connected with the first output end of the public signal bus, the other end of each pair of the second normally open contacts is connected with a core wire of the signal transmission cable, one end of the other pair of the second normally open contacts is connected with the second output end of the public signal bus, and the other end of each pair of the second normally open contacts is connected with a core wire of the signal transmission cable;
the signal transmission cable comprises a plurality of core wires for connecting the second relay to one of the channels under test in the channel under test connector through the core wires.
2. The multi-channel signal switching and coupling device of claim 1, wherein the channel-under-test connector comprises a plurality of channels-under-test, each of the channels-under-test comprising at least two test probes.
3. The multi-channel signal switching and coupling device according to claim 2, wherein the channel under test comprises two test probes, and the two test probes are respectively connected to two pairs of second normally open contacts of one of the second relays.
4. The multi-channel signal switching and coupling device according to claim 2, wherein two of the second relays are used as a set of test relays, the channel under test includes three test probes, two of the three test probes are respectively connected to two pairs of second normally open contacts of one of the second relays in the set of test relays, and the other test probe is connected to one of the two pairs of second normally open contacts of the other second relay in the set of test relays.
5. The multi-channel signal switching and coupling device according to claim 2, wherein three of the second relays are used as a set of test relays, the channel under test includes four test probes, two of the four test probes are respectively connected to two pairs of second normally open contacts of one of the second relays in the set of test relays, and the other two test probes are respectively connected to one pair of the two pairs of second normally open contacts of the other two of the second relays in the set of test relays.
6. The multi-channel signal switching and coupling device of claim 1, further comprising: a drive unit;
and the driving unit is used for respectively controlling the power-on/power-off of the coil of the first relay or the second relay after the first control signal and the second control signal are subjected to signal amplification.
7. The multi-channel signal switching and coupling device according to claim 6, wherein the driving unit comprises a plurality of electronic switching devices, a control terminal of each electronic switching device is used for receiving the first control signal or the second control signal, and two terminals of a switching channel of each electronic switching device, a coil of the first relay or the second relay and an operating power supply of the first relay or the second relay form a closed loop.
8. The multi-channel signal switching and coupling device of claim 6, further comprising: a power supply unit;
the power supply unit is used for receiving an input power supply, processing the input power supply to generate a first power supply and a second power supply, providing the first power supply for the main control unit to serve as a working power supply of the main control unit, and providing the second power supply for the driving unit, the first relay and the second relay to serve as the working power supply of the driving unit, the first relay and the second relay.
9. The multi-channel signal switching and coupling device of claim 1, wherein the common signal bus comprises:
a first conductive line and a second conductive line; wherein the content of the first and second substances,
the first conductive line includes a first input and a first output;
the second conductive line includes a second input and a second output.
10. A signal testing system, comprising: multi-channel signal switching and coupling device as claimed in any one of the claims 1-9.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187853A (en) * | 2020-08-18 | 2021-01-05 | 安徽沃信通信科技有限公司 | Signal detection system and method for multi-channel filter |
| CN112448713B (en) * | 2020-11-10 | 2022-01-28 | 北京新风航天装备有限公司 | Multi-signal automatic switching system based on LXI bus |
| CN112666636B (en) * | 2020-12-18 | 2023-07-14 | 西安空间无线电技术研究所 | Channel coupling performance test method for spectrum subdivision receiver of microwave radiometer |
| CN112803936A (en) * | 2020-12-23 | 2021-05-14 | 浙江中控技术股份有限公司 | Touch control's binary channels output auto-change over device |
| CN114070664A (en) * | 2021-10-25 | 2022-02-18 | 中国航空无线电电子研究所 | Multichannel bus switching device |
| CN114442004B (en) * | 2022-04-08 | 2022-07-15 | 河北南皮铁路器材有限责任公司 | Automatic checking table for relay combined wiring |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2789929Y (en) * | 2005-03-17 | 2006-06-21 | 上海华虹集成电路有限责任公司 | Multi path tester chip testing interface for non-contact applied chip |
| CN101930041A (en) * | 2010-09-03 | 2010-12-29 | 致茂电子(苏州)有限公司 | High-voltage multi-point testing equipment and method with main and auxiliary steps |
| CN202770933U (en) * | 2012-09-26 | 2013-03-06 | 北京广利核系统工程有限公司 | High-precision multichannel analog quantity automatic test system |
| CN103645440A (en) * | 2013-11-06 | 2014-03-19 | 广州擎天实业有限公司 | Switching device applied to multi-channel battery test |
| CN104865515A (en) * | 2015-05-12 | 2015-08-26 | 北京航空航天大学 | Multichannel integrated operational amplifier performance parameter on-line testing system |
| CN205563264U (en) * | 2016-04-15 | 2016-09-07 | 深圳市汇辰自动化技术有限公司 | Automatic test circuit of analog input |
| CN106054071A (en) * | 2016-08-11 | 2016-10-26 | 国家电网公司 | Relay calibration instrument |
| CN206115264U (en) * | 2016-09-23 | 2017-04-19 | 北京精密机电控制设备研究所 | Multibus multi -channel control ware tester |
| CN109358604A (en) * | 2018-11-01 | 2019-02-19 | 南京国电南自维美德自动化有限公司 | A kind of control system input and output module device for testing functions and test method |
| CN110376947A (en) * | 2019-07-26 | 2019-10-25 | 浙江中控技术股份有限公司 | A kind of multi channel signals switching circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012202642A1 (en) * | 2012-02-21 | 2013-08-22 | Siemens Aktiengesellschaft | Electric switch |
-
2020
- 2020-04-27 CN CN202010342273.XA patent/CN111487952B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2789929Y (en) * | 2005-03-17 | 2006-06-21 | 上海华虹集成电路有限责任公司 | Multi path tester chip testing interface for non-contact applied chip |
| CN101930041A (en) * | 2010-09-03 | 2010-12-29 | 致茂电子(苏州)有限公司 | High-voltage multi-point testing equipment and method with main and auxiliary steps |
| CN202770933U (en) * | 2012-09-26 | 2013-03-06 | 北京广利核系统工程有限公司 | High-precision multichannel analog quantity automatic test system |
| CN103645440A (en) * | 2013-11-06 | 2014-03-19 | 广州擎天实业有限公司 | Switching device applied to multi-channel battery test |
| CN104865515A (en) * | 2015-05-12 | 2015-08-26 | 北京航空航天大学 | Multichannel integrated operational amplifier performance parameter on-line testing system |
| CN205563264U (en) * | 2016-04-15 | 2016-09-07 | 深圳市汇辰自动化技术有限公司 | Automatic test circuit of analog input |
| CN106054071A (en) * | 2016-08-11 | 2016-10-26 | 国家电网公司 | Relay calibration instrument |
| CN206115264U (en) * | 2016-09-23 | 2017-04-19 | 北京精密机电控制设备研究所 | Multibus multi -channel control ware tester |
| CN109358604A (en) * | 2018-11-01 | 2019-02-19 | 南京国电南自维美德自动化有限公司 | A kind of control system input and output module device for testing functions and test method |
| CN110376947A (en) * | 2019-07-26 | 2019-10-25 | 浙江中控技术股份有限公司 | A kind of multi channel signals switching circuit |
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