CN216495327U - Test circuit of electrocardio equipment - Google Patents

Abstract

The application discloses test circuit of electrocardio equipment. The test circuit includes: a control circuit for generating a control signal corresponding to the test requirement; the resistance-capacitance network is used for accessing a test signal and is electrically connected with the electrocardio equipment, and the resistance-capacitance network consists of a plurality of resistance-capacitance circuits; the first relay is respectively electrically connected with the control circuit and the resistance-capacitance circuit and is used for selecting one or more resistance-capacitance circuits from the resistance-capacitance network to form a detection circuit under the control of a control signal so as to enable the detection circuit to output branch signals corresponding to the test requirements and test different performance parameters of the electrocardio equipment by utilizing different branch signals; and the polarization voltage control circuit is used for selectively connecting the polarization voltage to a branch circuit between the selected resistance-capacitance circuit and the electrocardio equipment under the control of the control signal so as to realize the common mode rejection test or the polarization voltage resistance test of the electrocardio equipment. The method and the device can realize the full-automatic test of the electrocardio equipment, and can effectively ensure the accuracy and repeatability of the test result.

Description

Test circuit of electrocardio equipment

Technical Field

The application relates to the technical field of medical electronic instruments, in particular to a test circuit of electrocardio equipment.

Background

For electrocardio monitoring and diagnosis equipment, the internal noise, common mode rejection capability and polarization voltage resistance capability are important indexes for evaluating the performance of the electrocardio equipment. The national and international standards related to the electrocardio-parameters all put forward specific requirements on the three indexes, and the electrocardio-equipment needs to be detected according to the standards when being registered domestically and internationally. The standard defines a test circuit of a test apparatus for testing these three criteria.

The inventor of the application discovers in long-term research and development work that the existing test circuit of the electrocardio equipment mostly uses a manual mechanical switch to realize the switching test of electrodes of each patient, so that the test circuit is large in size, low in automation degree, complex in operation, very easy to disturb, low in test efficiency and poor in test effect, and the accuracy and the repeatability of a test result are hardly guaranteed.

SUMMERY OF THE UTILITY MODEL

The technical problem mainly solved by the application is to provide a test circuit and a test method for electrocardio equipment, so that the full-automatic test of the electrocardio equipment is realized, and the accuracy and the repeatability of a test result are effectively ensured.

In order to solve the technical problem, the application adopts a technical scheme that: a test circuit for an electrocardiograph device is provided. This test circuit of electrocardio equipment includes: a control circuit for generating a control signal corresponding to the test requirement; the resistance-capacitance network is used for accessing a test signal and is electrically connected with the electrocardio equipment, and the resistance-capacitance network consists of a plurality of resistance-capacitance circuits; the first relay is respectively electrically connected with the control circuit and the resistance-capacitance circuit and is used for selecting one or more resistance-capacitance circuits from the resistance-capacitance network to form a test circuit under the control of a control signal so that the test circuit outputs branch signals corresponding to test requirements and different performance parameters of the electrocardio equipment are tested by utilizing different branch signals; and the polarization voltage control circuit is respectively electrically connected with the control circuit, the first relay and the electrocardio equipment and is used for selectively connecting the polarization voltage to a branch circuit between the selected resistance-capacitance circuit and the electrocardio equipment under the control of a control signal so as to realize the common mode rejection test or the polarization voltage resistance test of the electrocardio equipment.

In one embodiment, the RC circuit includes: one end of the capacitor is connected with the test signal, and the other end of the capacitor is electrically connected with the electrocardio equipment; one end of the resistor is electrically connected with one end of the capacitor, and the other end of the resistor is connected with the other end of the capacitor; the control end of the first relay is electrically connected with the control circuit, the static contact of the first relay is electrically connected with the other end of the capacitor, and the movable contact of the first relay is electrically connected with one end of the capacitor.

In a specific embodiment, the testing circuit of the electrocardiograph device further comprises: a polarization voltage generating circuit for generating a polarization voltage; the polarization voltage control circuit is respectively and electrically connected with the resistance-capacitance network, the control circuit, the polarization voltage generating circuit and the electrocardio equipment and is used for selectively connecting the polarization voltage generating circuit in series between the selected resistance-capacitance circuit and the electrocardio equipment under the control of a control signal so as to realize the common mode rejection test or the polarization voltage resistance test of the electrocardio equipment.

In a specific embodiment, the polarization voltage control circuit includes: the control end of the second relay is electrically connected with the control circuit, the first fixed contact of the second relay is electrically connected with the second fixed contact, the third fixed contact and the fourth fixed contact of the second relay are respectively electrically connected with two electrodes of the polarization voltage generating circuit, the first movable contact of the second relay is electrically connected with the resistance-capacitance circuit, and the second movable contact of the second relay is electrically connected with the electrocardio equipment; the control end controls the first movable contact to be electrically connected with the first fixed contact and the second movable contact to be electrically connected with the second fixed contact under the control of the control signal, or controls the first movable contact to be electrically connected with the third fixed contact and the second movable contact to be electrically connected with the fourth fixed contact.

In one embodiment, the polarization voltage generation circuit includes: a voltage source; the control end of the third relay is electrically connected with the control circuit, the first fixed contact and the second fixed contact of the third relay are respectively electrically connected with the positive pole of the voltage source, the third fixed contact and the fourth fixed contact of the third relay are respectively electrically connected with the negative pole of the voltage source, the first movable contact of the third relay is electrically connected with the third fixed contact of the second relay, and the second movable contact of the third relay is electrically connected with the fourth fixed contact of the second relay; and the control end of the third relay controls the first movable contact of the third relay to be electrically connected with the first fixed contact of the third relay and the second movable contact of the third relay to be electrically connected with the fourth fixed contact of the third relay under the control of the control signal, or controls the first movable contact of the third relay to be electrically connected with the third fixed contact of the third relay and the second movable contact of the third relay to be electrically connected with the second fixed contact of the third relay.

In a specific embodiment, the polarization voltage control circuit comprises a plurality of second relays, the polarization voltage generating circuit comprises a third relay, the plurality of second relays are arranged in one-to-one correspondence with the plurality of resistance-capacitance circuits, and the third relays are respectively electrically connected with the plurality of second relays.

In one embodiment, the testing circuit of the electrocardiograph device further includes: and the signal generating circuit is respectively electrically connected with the control circuit and the resistance-capacitance network and is used for acquiring the signal parameters of the test signals from the control circuit and generating the test signals corresponding to the signal parameters.

In one embodiment, the testing circuit of the electrocardiograph device further includes: and the mode switching circuit is respectively electrically connected with the control circuit, the signal generating circuit and the resistance-capacitance network and is used for disconnecting or connecting the electrical connection between the signal generating circuit and the resistance-capacitance network under the control of the control circuit so as to realize the noise test or the signal test of the electrocardio equipment, wherein the test signal comprises a common mode rejection test and a polarization resistant voltage test.

In one embodiment, the mode switching circuit includes: and the control end of the fourth relay is electrically connected with the control circuit, the first static contact of the fourth relay is in idle connection, the second static contact of the fourth relay is electrically connected with the signal generating circuit, and the moving contact of the fourth relay is electrically connected with the resistance-capacitance network.

In one embodiment, the test circuit further comprises: the first driving circuit is electrically connected with the control circuit and the first relay and is used for driving the first relay to act under the control of the control circuit; and the second driving circuit is electrically connected with the control circuit and the second relay and is used for driving the second relay to act under the control of the control circuit.

The beneficial effects of the embodiment of the application are that: the control circuit of the resistance-capacitance network is realized by the relay, and the action of the relay is controlled by the control circuit, so that the test required by the standard can be automatically completed; the testing efficiency can be improved without manual complicated operation in the testing process, the integration level of the testing circuit is high, the reliability is high, and the accuracy and the repeatability of the testing result can be effectively ensured.

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 embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a circuit configuration of a test circuit of the electrocardiograph device;

FIG. 2 is a schematic diagram of an embodiment of a testing circuit for an ECG device according to the present application;

FIG. 3 is a schematic diagram of an embodiment of a testing circuit for an electrocardiograph device according to the present application;

FIG. 4 is a schematic diagram of an embodiment of a testing circuit for an ECG device according to the present application;

FIG. 5 is a schematic diagram of an embodiment of a testing circuit for an ECG device according to the present application;

FIG. 6 is a schematic circuit diagram of the slave controller circuit, the detection circuit and the mode switching circuit in the embodiment of FIG. 5;

FIG. 7 is a schematic diagram of an embodiment of a test circuit for an electrocardiograph device according to the present application;

FIG. 8 is a schematic diagram of a RC circuit and a RC network control circuit in a testing circuit of an electrocardiograph apparatus according to the present application;

FIG. 9 is a schematic diagram of a polarization control circuit and a polarization voltage generating circuit in a testing circuit of an electrocardiograph apparatus according to the present application;

FIG. 10 is a schematic circuit diagram of a mode switching circuit in a test circuit of the electrocardiograph apparatus of the present application;

FIG. 11 is a schematic flowchart of an embodiment of a method for testing an electrocardiograph device according to the present application;

fig. 12 is a schematic flowchart of an embodiment of a testing method for electrocardiograph devices according to the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.

National and international standards related to electrocardiogram parameters all provide specific requirements for three indexes of internal noise, common mode rejection capability and polarization voltage resistance of electrocardiogram equipment, and a test circuit for testing the three indexes is defined in the standards, as shown in fig. 1: test signals of 50Hz and 20V (different from different standard test signals) are applied to the common node through a capacitor (C1-Cx) of 100pF, patient electrodes RA, LA, … …, RL (electrically connected with the electrocardiograph) are connected to the common node through resistors R of 51k omega and a capacitor C of 47nF, and a polarization voltage of +/-300 mV is serially connected into the test circuit for testing in an unbalanced impedance mode. The tests of the electrocardio-noise, the common mode rejection capability and the polarization resistant voltage are carried out by controlling the switch (S1-Sn) and the switch Sa according to the standard requirements.

In order to realize the fully-automatic testing of the electrocardiograph equipment, improve the anti-interference capability of the electrocardiograph equipment and further improve the accuracy and repeatability of the performance testing of the electrocardiograph equipment, the application firstly provides a testing circuit of the electrocardiograph equipment, as shown in fig. 2, and fig. 2 is a schematic structural diagram of an embodiment of the testing circuit of the electrocardiograph equipment. The test circuit (not shown) of the electrocardiograph device of the present embodiment includes: a master controller circuit 10, a slave controller circuit 20, and a detection circuit 30; wherein the main controller circuit 10 is configured to generate at least a first control signal according to a test requirement; the slave controller circuit 20 is in communication connection with the master controller circuit 10, and the slave controller circuit 20 operates under the control of a first control signal; the detection circuit 30 is electrically connected to the slave controller circuit 20 and the electrocardiograph device 40, and is configured to adjust a circuit structure of the slave controller circuit 20, so that the adjusted detection circuit 30 converts the test signal into different branch signals, and tests different performance parameters of the electrocardiograph device 40 by using the different branch signals.

In the national and international standards related to electrocardiographic parameters, when three indexes of internal noise, common mode rejection capability and polarization voltage resistance capability of the electrocardiograph device 40 are tested, states of parameters such as whether each patient electrode needs to be connected with polarization voltage, positive polarization voltage or negative polarization voltage, whether a resistance-capacitance circuit is connected, lead testing time and the like are stipulated, and the states of the parameters are different, so that the specific circuit structure of the detection circuit 30 is different.

In this embodiment, the master controller circuit 10 and the slave controller circuit 20 are utilized to adjust the specific circuit structure of the detection circuit 30 according to the test requirement, that is, the parameter requirement, so that the adjusted specific circuit meets the test requirement, the test signal can be converted into a branch signal corresponding to the test requirement, and the branch signal is output to the corresponding patient electrode, so as to test the performance parameter corresponding to the electrocardiographic device 40 by using the branch signal.

The master Controller circuit 10 of this embodiment may be implemented by a Micro Controller Unit (MCU), the slave Controller circuit 20 may be implemented by another MCU, and the two MCUs are connected in communication, for example, by a wire (in other embodiments, the two MCUs may be connected wirelessly) to realize electrical isolation between the two MCUs, where the electrical isolation means that noise interference does not exist between the master Controller circuit 10 and the slave Controller circuit 20 except for transmission of useful signals.

Of course, the master controller circuit 10 and the slave controller circuit 20 may be implemented by non-integrated control circuits, and the master controller circuit 10 and the slave controller circuit 20 may be implemented by different and insulated circuit boards; the detection circuit 30 is electrically isolated from the master controller circuit 10 and may be located on the same circuit board as the slave controller circuit 20.

In a test apparatus (not shown) of the electrocardiograph 40, an insulating member (not shown) may be provided between the master controller circuit 10 and the slave controller circuit 20 and the detection circuit 30, and a through hole for passing a lead may be provided between the insulating members; the isolation between the master controller circuit 10 and the slave controller circuit 20 and the detection circuit 30 is further improved by the insulating member.

In the embodiment, the main controller circuit 10 and the sub-controller circuit 20 which are in communication connection are adopted to realize the control of the performance parameter test of the electrocardiograph device 40, and the detection circuit 30 is electrically isolated from the main controller circuit 10, so that part of control circuits, namely the noise interference of the main controller circuit 10 to the detection circuit 30, can be effectively reduced, a cleaner test environment can be obtained, the anti-interference performance of the test environment can be improved, and the accuracy and the repeatability of a test result can be improved; in addition, in the embodiment, the main controller circuit 10 and the sub-controller circuit 20 automatically control and complete the test required by the standard, manual complex operation is not needed in the test process, the production efficiency of the production line can be improved, the training difficulty of operators is reduced, the test circuit is high in integration level and reliability, and the accuracy and repeatability of the test result can be effectively improved. Therefore, the embodiment can realize the full-automatic test of the electrocardiograph device 40, and improve the anti-interference capability thereof, thereby improving the accuracy and repeatability of the performance test thereof.

Optionally, the detection circuit 30 of the present embodiment includes: a resistance-capacitance network 31 and a resistance-capacitance network control circuit 32; the resistance-capacitance network 31 is connected to the test signal and electrically connected to the electrocardiograph 40, and the resistance-capacitance network 31 is composed of a plurality of resistance-capacitance circuits (not shown, a circuit composed of a capacitor and a resistor); the rc network control circuit 32 is electrically connected to the rc circuit and the slave controller circuit 20, and is configured to select one or more rc circuits from the rc network 31 to form the detection circuit 30 under the control of the slave controller circuit 20, so that the detection circuit 30 outputs a branch signal corresponding to the test requirement.

A single or a plurality of resistance-capacitance circuits are selected from the resistance-capacitance network 31 under the control of the slave controller circuit 20 to constitute the detection circuit 30 according to the above-described parameter states.

Optionally, the testing on the electrocardiograph device 40 includes a signal testing, the signal testing includes a common mode rejection testing and a polarization tolerant voltage testing, and the detection circuit 30 of this embodiment further includes: a polarization voltage generation circuit 33 and a polarization voltage control circuit 34; wherein, the polarization voltage generating circuit 33 is used for generating polarization voltage; the polarization voltage control circuit 34 is electrically connected to the resistance-capacitance network 31, the slave controller circuit 20, the polarization voltage generating circuit 33 and the electrocardiograph device 40, and the polarization voltage control circuit 34 selectively connects the polarization voltage generating circuit 33 in series between the selected resistance-capacitance circuit and the electrocardiograph device 40 under the control of the slave controller circuit 20, so as to realize the common mode rejection test or the polarization voltage resistance test of the electrocardiograph device 40.

In a test standard, a lead (branch) is connected to a resistance-capacitance network, while other leads are not connected to a resistance-capacitance circuit, and the lead is considered to be connected to unbalanced impedance, and polarization voltage is applied to the lead to perform polarization voltage resistance test.

In another test standard, a certain lead (branch) is not connected to the RC network, and other leads are connected to the RC circuit, or the lead is considered to be connected to unbalanced impedance, and at this time, other leads need to apply polarization voltage to perform polarization voltage resistance test.

It should be noted that the control signals for controlling the rc network control circuit 32 and the polarization voltage control circuit 34 may be the first control signal directly generated by the master controller circuit 10, or may be the control signal corresponding to the test requirement generated by the slave controller circuit 20 based on the first control signal, which is not limited herein.

The polarization voltage generating circuit 33 is electrically connected to the electrocardiograph 40 via the polarization voltage control circuit 34.

Specifically, when the common mode rejection test is performed on the electrocardiograph device 40, it is not necessary to connect a polarization voltage to the test signal (branch signal of the lead), and at this time, the polarization voltage control circuit 34 disconnects the electrical connection between the polarization voltage generation circuit 33 and the electrocardiograph device 40 under the control of the slave controller circuit 20, so as to implement the common mode rejection test of the electrocardiograph device 40.

When the electrocardiograph device 40 is subjected to the polarization voltage resistance test, a polarization voltage needs to be connected to the test signal (branch signal of the lead), and at this time, the polarization voltage control circuit 34 conducts the electrical connection between the polarization voltage generation circuit 33 and the electrocardiograph device 40 under the control of the slave controller circuit 20, so as to realize the polarization voltage resistance test of the electrocardiograph device 40.

Therefore, the present embodiment can realize the full-automatic test and switching of the common mode rejection test and the polarization voltage resistance test of the electrocardiograph device 40.

Optionally, the main controller circuit 10 of this embodiment further generates a second control signal according to the test requirement, and the test circuit of this embodiment further includes a mode switching circuit 50, which is electrically connected to the main controller circuit 10 and the rc network 31, respectively, and is used for selectively accessing the test signal under the control of the second control signal of the main controller circuit 10 to implement a noise test or a signal test (a common mode rejection test and a polarization-tolerant voltage test) of the electrocardiograph apparatus 40.

When the noise test is performed on the electrocardiograph device 40, the resistance-capacitance network 31 does not need to access a test signal, and at this time, the main controller circuit 10 controls the mode switching circuit 50 to disconnect a path of the resistance-capacitance network 31 to access the test signal, so as to implement the noise test on the electrocardiograph device 40.

When the common mode rejection test or the polarization voltage resistance test is performed on the electrocardiograph device 40, the resistance-capacitance network 31 needs to access a test signal, and at this time, the main controller circuit 10 controls the mode switching circuit 50 to connect a path through which the resistance-capacitance network 31 accesses the test signal, so as to implement the common mode rejection test or the polarization voltage resistance test of the electrocardiograph device 40.

Therefore, the present embodiment can realize the fully automatic test and switching of the noise test, the common mode rejection test, and the polarization voltage resistance test of the electrocardiograph device 40.

The mode switching circuit 50 of the present embodiment is controlled by the master controller circuit 10, and may be disposed on the same circuit board as the master controller circuit 10, and the rc network 31, the rc network control circuit 32, the polarization voltage generating circuit 33, and the polarization voltage control circuit 34 may be disposed on another circuit board than the slave controller circuit 20, so as to achieve electrical isolation between the mode switching circuit 50, the master controller circuit 10, the rc network 31, the rc network control circuit 32, the polarization voltage generating circuit 33, the polarization voltage control circuit 34, and the slave controller circuit 20.

The slave controller circuit 20 may feed back information such as the operating state and abnormal state of the resistance-capacitance network 31, the resistance-capacitance network control circuit 32, the polarization voltage generation circuit 33, and the polarization voltage control circuit 34 to the master controller circuit 10, in addition to the first control signal acquired from the master controller circuit 10.

The resistance-capacitance network control circuit 32 can control any one or more leads to be added into the resistance-capacitance network 31, and the polarization voltage control circuit 34 can control any one or more leads to be added with positive polarization voltage or negative polarization voltage, and finally shows that the electrocardio standard requirements are tested on the electrocardio electrodes of different electrocardio equipment 40.

All of the resistance-capacitance network control circuit 32 and the polarization voltage control circuit 34 are automatically completed by the slave controller circuit 20, so that a test system with high integration, automation, reliability and test efficiency is realized, and the test purpose of standard requirements is finally achieved.

The present application further provides a test circuit of an electrocardiograph device according to another embodiment, as shown in fig. 3, the test circuit of this embodiment is different from the test circuit of the embodiment shown in fig. 2 in that: the test circuit of the present embodiment further includes: the signal generating circuit 60 is electrically connected to the main controller circuit 10 and the rc network 31, respectively, and is configured to obtain a signal parameter of the test signal from the main controller circuit 10 and generate a test signal corresponding to the signal parameter.

Different test standards require different standard test signals, and the present embodiment utilizes the main controller circuit 10 to control the signal generating circuit 60 to generate different standard test signals based on different signal parameters, so as to implement different standard tests on the electrocardiograph device 40.

The signal generating circuit 60 is electrically connected to the rc network 31 through the mode switching circuit 50; the mode switching circuit 50 disconnects or connects the electrical connection between the signal generating circuit 60 and the RC network 31 under the control of the second control signal of the main controller circuit 10, so as to realize the noise test or signal test of the ECG device 40.

Therefore, the present embodiment can not only realize the fully automated testing and switching of the noise test, the common mode rejection test, and the polarization voltage resistance test of the electrocardiograph device 40, but also realize the automated testing and switching of a plurality of different standards.

Further, the signal generating circuit 60 of the present embodiment is controlled by the master controller circuit 10 and is disposed on the same circuit board as the master controller circuit 10, so that noise interference of the signal generating circuit 60 to the rc network 31, the rc network control circuit 32, the polarization voltage generating circuit 33, the polarization voltage control circuit 34, and the slave controller circuit 20 can be avoided.

In another embodiment, the main controller circuit may be a separate microcontroller, and the signal generating circuit may be a DAC circuit built in the microcontroller, and the DAC circuit generates a sine wave signal with a standard specified frequency by simulation, and obtains a test signal required by the standard through appropriate amplification processing.

The present application further provides a test circuit of an electrocardiograph device according to another embodiment, as shown in fig. 4, the test requirement of the present embodiment includes a first test requirement and a second test requirement, and the difference between the test circuit of the present embodiment and the test circuit of the embodiment in fig. 3 is: the test circuit of the present embodiment further includes: a display circuit 70 electrically connected to the main controller circuit 10 for inputting a first test request; and the key circuit 80 is electrically connected with the main controller circuit 10 and is used for inputting a second test requirement.

The first test requirement may include a test mode of the electrocardiograph device 40, such as a noise test mode, a common mode rejection test mode, a polarization-tolerant voltage test mode, and information such as a test standard; the second test requirement may include information about the start, stop and duration of the test apparatus.

A user can send information such as a test standard, a test mode, and the like to the main controller circuit 10 through the display circuit 70; the user can send information such as a test start or end instruction to the main controller circuit 10 through the key circuit 80.

The display circuitry 70 may also be used for human-computer interaction; the key circuit 80 may be a shuttle, a dial, etc., and may also be used for human-machine interaction.

The display circuit 70 displays the amplitude frequency, leads and polarization voltage state of the test signal.

In other embodiments, the display circuit or the key circuit can be selectively set to input the test requirement.

The display circuit 70 and the key circuit 80 are electrically isolated from the resistance-capacitance network 31, the resistance-capacitance network control circuit 32, the polarization voltage generation circuit 33, the polarization voltage control circuit 34, and the slave controller circuit 20, thereby reducing noise interference.

The electrocardio equipment of the application is electrocardio monitoring and diagnosis equipment, such as an electrocardio detector, a fetal heart instrument and the like.

The present application further provides a test circuit of an electrocardiograph device according to another embodiment, as shown in fig. 5 and fig. 6, the test circuit of the present embodiment includes: a first controller circuit 51, a first secondary control circuit 52, a second secondary control circuit 53, a resistance-capacitance network circuit 36 and a polarization voltage control circuit 34; the first controller circuit 51 is configured to obtain a first control signal and a second control signal corresponding to a test requirement; the resistance-capacitance network circuit 36 is electrically connected with the electrocardiograph device 40 and is used for converting the test signal into a branch signal corresponding to the test requirement so as to test the corresponding performance parameter of the electrocardiograph device 40 by using the branch signal; the polarization voltage control circuit 34 is electrically connected with the resistance-capacitance network circuit 36 and the electrocardio device 40 and is used for accessing a polarization voltage to a test signal; the first secondary control circuit 52 is respectively electrically connected with the resistance-capacitance network circuit 36 and the first controller circuit 51, and works under the control of a first control signal, and the resistance-capacitance network circuit 36 adjusts the circuit structure thereof under the control of the first secondary control circuit 52, so that the adjusted circuit structure can convert the test signal into a branch signal corresponding to the test requirement; the second secondary control circuit 53 is electrically connected to the first controller circuit 51 and the polarization voltage control circuit 34, respectively, and operates under the control of a second control signal, and the polarization voltage control circuit 34 selectively connects the polarization voltage to the branch signal under the control of the second secondary control circuit 53, so as to implement the polarization voltage resistance test or the common mode rejection test of the electrocardiograph device 40.

In this embodiment, the first secondary control circuit 52 and the second secondary control circuit 53 are respectively disposed between the first controller circuit 51 and the resistance-capacitance network circuit 36 and the polarization voltage control circuit 34, so that the first secondary control circuit 52 obtains the first sub-control signal and the second secondary control circuit 53 obtains the second sub-control signal, which can be processed in parallel, thereby not only reducing the number of ports on the first controller circuit 51 and realizing efficient control, but also improving the synchronism of the first controller circuit 51 in controlling the resistance-capacitance network circuit 36 and the polarization voltage control circuit 34, and further improving the accuracy of the test; meanwhile, the first secondary control circuit 52 can convert the serial signal into a parallel signal to synchronously apply the first sub-control signal to the plurality of control sections of the resistance-capacitance network circuit 36, and the second secondary control circuit 53 can convert the serial signal into a parallel signal to synchronously apply the second sub-control signal to the plurality of control sections of the polarization voltage control circuit 34 corresponding to the plurality of resistance-capacitance circuits 54 to realize independent control of an arbitrary control section (lead switch) by the first controller circuit 51. Therefore, the control efficiency and accuracy of the test of the electrocardiograph device 40 can be improved.

The slave controller circuit 20 is implemented by a first controller circuit 51, a first secondary control circuit 52, and a second secondary control circuit 53.

Optionally, the rc network circuit 36 of this embodiment includes: a resistance-capacitance network 31 and a resistance-capacitance network control circuit 32; the resistance-capacitance network 31 is connected with the test signal and is electrically connected with the electrocardio equipment 40, and the resistance-capacitance network 31 is composed of a plurality of resistance-capacitance circuits 54; the rc network control circuit 32 is electrically connected to the rc circuit 54 and the first secondary control circuit 52, and is configured to select one or more rc circuits 54 from the rc network 31 to form an adjusted network structure under the control of the first secondary control circuit 52.

Optionally, the present embodiment further includes a polarization voltage generating circuit 33 for generating a polarization voltage; the polarization voltage control circuit 34 is electrically connected to the resistance-capacitance network 31, the second secondary control circuit 53, the polarization voltage generating circuit 33, and the electrocardiograph 40, and is configured to selectively connect the polarization voltage generating circuit 33 in series between the resistance-capacitance circuit 54 and the electrocardiograph 40 under the control of the second control signal, so as to implement a common mode rejection test or a polarization voltage resistance test of the electrocardiograph 40.

The resistance-capacitance network 31, the resistance-capacitance network control circuit 32, the polarization voltage generation circuit 33 and the polarization voltage control circuit 34 of the present embodiment constitute the detection circuit 30.

The adjusting circuit structure selects one or more rc circuits 54 from the rc network 31 to form the rc network 31 corresponding to the test requirement and standard.

Optionally, the test circuit of this embodiment further includes a second controller circuit (not shown), connected to the first controller circuit 20, for obtaining a test requirement and generating a first control signal and a second control signal according to the test requirement.

Wherein the present embodiment implements the main controller circuit 10 by a second controller circuit.

In other embodiments, the first sub-control signal and the second sub-control signal may be generated by the first controller circuit 20 based on the first control signal.

Optionally, this embodiment may further include other circuits in fig. 5, which may specifically refer to the foregoing embodiments and are not described herein.

Optionally, the rc network control circuit 32 of the present embodiment includes a plurality of first switches K1 (lead switches) disposed in one-to-one correspondence with the plurality of rc circuits 54, one end of the rc circuit 54 is connected to the test signal (electrically connected to the signal generating circuit 60 through the mode switching circuit 50), the other end of the rc circuit 54 is electrically connected to the electrocardiograph 40, a fixed end of the first switch K1 is connected to one end of the rc circuit 54, and a selection end of the first switch K1 is selectively electrically connected to the electrocardiograph 40 under the control of the first secondary control circuit 52.

The first secondary control circuit 52 determines whether each rc circuit 54 is connected to the rc network 31 (whether a lead is connected) according to the first sub-control signal, and controls the first switch K1 corresponding to the rc circuit 54 to be connected to close when it is determined that the rc circuit 54 is to be connected to the rc network 31.

Optionally, the resistance-capacitance network control circuit 32 of this embodiment further includes: the first driving circuit, which may be a driver 55, is electrically connected to the first secondary control circuit 52 and the selection terminal of the first switch K1, respectively, and drives the first switch K1 to operate under the control of the first secondary control circuit 52.

In the embodiment, the driver 55 is provided to increase the driving capability of the first switch K1, so as to ensure the normal operation of the first switch K1.

Optionally, the polarization voltage control circuit 33 of the present embodiment includes a plurality of second switches K2 (lead switches) disposed in one-to-one correspondence with the plurality of resistance-capacitance circuits 54, two fixed ends of the second switch K2 are electrically connected to the resistance-capacitance circuit 54 and the polarization voltage generating circuit 33, respectively, and a selection end of the second switch K2 is selectively electrically connected to the electrocardiograph 40 under the control of the second secondary control circuit 53.

The second secondary control circuit 53 determines whether the branch where each resistance-capacitance circuit 54 is located is connected to a polarization voltage according to the second sub-control signal, and controls the corresponding second switch K2 to be closed when it is determined that the branch where the resistance-capacitance circuit 54 is located is connected to the polarization voltage.

To simplify the circuit structure, only one polarization voltage generating circuit 33 may be provided, and the polarization voltage generating circuit may be electrically connected to the plurality of polarization voltage control circuits 33, respectively, to supply the polarization voltages to the plurality of branches.

The polarization voltage control circuit 33 may also control the polarization voltage generation circuit 33 to output a positive polarization voltage or a negative polarization voltage.

Optionally, the polarization voltage control circuit 33 of this embodiment further includes: the second driving circuit, which may be a driver 56, is electrically connected to the second secondary control circuit 53 and the selection terminal of the second switch K2, and drives the second switch K2 to operate under the control of the second secondary control circuit 53.

In the embodiment, the driver 56 is provided to increase the driving capability of the second switch K2, so as to ensure the normal operation of the second switch K2.

The first secondary control circuit 52 and the second secondary control circuit 53 may be implemented by a control chip.

Optionally, the first secondary control circuit 52 of this embodiment is provided with a first enable port (not shown), the second secondary control circuit 53 is provided with a second enable port (not shown), and both the first enable port and the second enable port are electrically connected to the first controller circuit 51 to synchronously obtain an enable signal from the first controller circuit 51, so that the synchronism of the switching operation can be improved, and the interference to the test in the processes of the resistance-capacitance network 31 and the polarization voltage switching can be reduced.

The specific circuit structure of the rc network 31, the rc network control circuit 32, the polarization voltage generating circuit 33 and the polarization voltage control circuit 34 in this embodiment can be applied to other embodiments.

The present application further provides a testing circuit of an electrocardiograph device, as shown in fig. 7, the testing circuit of this embodiment includes: control circuit 72, rc network 31, first relay (not shown) and polarization voltage control circuit 34; the control circuit 72 is configured to generate a control signal corresponding to the test requirement; the resistance-capacitance network 31 is used for accessing a test signal and is electrically connected with the electrocardiograph device 40, and the resistance-capacitance network 31 is composed of a plurality of resistance-capacitance circuits 54 (see fig. 6); the first relay is respectively electrically connected with the control circuit 72 and the resistance-capacitance circuit 54 and is used for selecting one or more resistance-capacitance circuits 54 from the resistance-capacitance network 31 to form a test circuit under the control of a control signal, so that the test circuit outputs branch signals corresponding to test requirements, and different performance parameters of the electrocardio equipment are tested by using different branch signals; the polarization voltage control circuit 34 is electrically connected to the control circuit 72, the first relay, and the electrocardiograph 40, and is configured to selectively connect the polarization voltage to a branch between the selected rc circuit 54 and the electrocardiograph 40 under the control of the control signal, so as to implement a common mode rejection test or a polarization voltage resistance test of the electrocardiograph 40.

The present embodiment implements the switching circuit in the resistance-capacitance network control circuit 32 using the first relay. In order to ensure the normal operation of the first relay, a first driving circuit (not shown) may be further provided, and is electrically connected to the control circuit 72 and the first relay, and is configured to drive the first relay to operate under the control of the control circuit 72.

In the embodiment, the relay is used for realizing the control circuit of the resistance-capacitance network, and the control circuit is used for controlling the action of the relay, so that the test required by the standard can be automatically completed; the testing efficiency can be improved without manual complicated operation in the testing process, the integration level of the testing circuit is high, the reliability is high, and the accuracy and the repeatability of the testing result can be effectively ensured.

In another embodiment, as shown in fig. 8, the rc circuit 54 of the present embodiment includes: a capacitor c and a resistor r; one end of the capacitor c is connected with a test signal (electrically connected with the port A3), and the other end of the capacitor c is electrically connected with the electrocardio device 40 (connected with the port A4) through the polarization voltage control circuit 33; one end of the resistor r is electrically connected with one end of the capacitor c, and the other end of the resistor r is electrically connected with the other end of the capacitor c; the first switch K1 is implemented by a first relay, a control terminal 8 of which is electrically connected with the control circuit 72 (specifically, the first secondary control circuit 52), a stationary contact 4 of which is electrically connected with the other end of the capacitor c, and a movable contact 3 of which is electrically connected with one end of the capacitor c.

The polarization voltage control circuit 34 of the present embodiment is electrically connected to the resistance-capacitance network 31, the control circuit 72 (specifically, the second secondary control circuit 53), the polarization voltage generating circuit 33, and the electrocardiograph device 40, respectively, and is configured to connect the polarization voltage generating circuit 33 in series between the selected resistance-capacitance circuit 54 and the electrocardiograph device 40 under the control of the control signal, so as to implement a common mode rejection test or a polarization voltage resistance test of the electrocardiograph device 40.

Fig. 8 shows only one rc circuit 54 and its corresponding control circuit portion in this embodiment, i.e. one lead branch and its control circuit, and the other lead branches are implemented similarly. The first secondary control circuit 52 controls whether the current lead is connected to unbalanced impedance (a resistance-capacitance circuit 54) by controlling the control terminal 8 of the first relay, and the static contact 2 of the first relay is in idle connection; when the first relay acts, the unbalanced impedance is not accessed, otherwise, the unbalanced impedance is accessed by the current lead.

For different test standards, when a lead is connected to the RC circuit 54 and all other leads are not connected to the RC circuit 54, or the lead is not connected to the RC circuit 54 and all other leads are connected to the RC circuit 54, the lead is called to add unbalanced impedance. Similarly, the other leads add unbalanced impedance in the same manner as the lead.

In other embodiments, a relay having only one stationary contact and one movable contact may be selected.

Optionally, the test circuit of this embodiment further includes: the signal generating circuit 60 is electrically connected to the control circuit 72 and the rc network 31, respectively, and is configured to obtain a signal parameter of the test signal from the control circuit 72 (specifically, from the main controller circuit 10) and generate a test signal corresponding to the signal parameter.

Optionally, the test circuit of this embodiment further includes: the mode switching circuit 50 is electrically connected to the control circuit 72 (specifically, the slave main controller circuit 10), the signal generating circuit 60, and the rc network 31, and is configured to disconnect or connect the electrical connection between the signal generating circuit 60 and the rc network 31 under the control of the control circuit 72 (specifically, the master controller circuit 10) to implement a noise test or a signal test of the electrocardiograph device 40, where the test signal includes a common mode rejection test and a polarization-tolerant voltage test.

Optionally, the test circuit of the present embodiment further includes a display circuit 70 electrically connected to the control circuit 72 (specifically, to the main controller circuit 10) for inputting the first test requirement; the key circuit 80 is electrically connected to the control circuit 72 (specifically, the main controller circuit 10) for inputting the second test request.

Other circuit structures of the test circuit of this embodiment can refer to the above embodiments, and are not described herein.

In another embodiment, as shown in fig. 9, the second switch K2 of the polarization voltage control circuit 34 of the present embodiment is implemented by a second relay, the control terminal 8 of the second relay is electrically connected to the control circuit 72 (specifically, the second secondary control circuit 53), the first stationary contact 2 of the second relay is electrically connected to the second stationary contact 7, the third stationary contact 4 and the fourth stationary contact 5 of the second relay are electrically connected to the two electrodes of the polarization voltage generating circuit 33, the first movable contact 3 of the second relay is electrically connected to the resistance-capacitance circuit 54 (electrically connected to the port a 4), and the second movable contact 6 of the second relay is electrically connected to the electrocardiograph 40 (electrically connected to the port a 5).

The control end 8 of the second relay controls the first movable contact 3 to be electrically connected with the first fixed contact 2 and the second movable contact 6 to be electrically connected with the second fixed contact 7 under the control of the control signal of the control circuit 72 (specifically, the second secondary control circuit 53), at this time, the second relay disconnects the electric connection between the resistance-capacitance circuit 54 and the polarization voltage generating circuit 33, and the lead branch where the resistance-capacitance circuit 54 is located is not connected with the polarization voltage; or the control end 8 of the second relay controls the first movable contact 3 to be electrically connected with the third fixed contact 4 and the second movable contact 6 to be electrically connected with the fourth fixed contact 5 under the control of the control signal of the control circuit 72, at this time, the second relay conducts the electric connection between the resistance-capacitance circuit 54 and the polarization voltage generating circuit 33, and the lead branch where the resistance-capacitance circuit 54 is located is connected with the polarization voltage.

Alternatively, the polarization voltage generating circuit 51 of the present embodiment includes: a voltage source (not shown) and a third relay (not shown), wherein the control end of the third relay is electrically connected with the control circuit 72 (specifically, the second secondary control circuit 53), the first fixed contact 4 and the second fixed contact 7 of the third relay are respectively electrically connected with the positive pole of the voltage source, the third fixed contact 2 and the fourth fixed contact 5 of the third relay are respectively electrically connected with the negative pole of the voltage source of the third relay, the first movable contact 3 of the third relay is electrically connected with the third fixed contact 4 of the second relay, and the second movable contact 6 of the third relay is electrically connected with the fourth fixed contact 5 of the second relay.

The control end 8 of the third relay controls the first movable contact 3 of the third relay to be electrically connected with the first fixed contact 4 of the third relay and the second movable contact 6 of the third relay to be electrically connected with the fourth fixed contact 5 of the third relay under the control of the control signal of the control circuit 72 (specifically, the second secondary control circuit 53); at this time, the polarization voltage generation circuit 33 applies a positive polarization voltage between the ports a4 and a5, that is, the lead branch (branch signal). Or the control end 8 of the third relay controls the first movable contact 3 of the third relay to be electrically connected with the third fixed contact 2 of the third relay and the second movable contact 6 of the third relay to be electrically connected with the second fixed contact 7 of the third relay under the control of the control signal of the control circuit 72 (specifically, the second secondary control circuit 53); at this time, the polarization voltage generation circuit 33 applies a negative polarization voltage between the ports a4 and a5, that is, the lead branch.

Alternatively, the polarization voltage control circuit 34 includes a plurality of second relays, and the polarization voltage generating circuit 33 includes a third relay, the plurality of second relays are provided in one-to-one correspondence with the plurality of resistance-capacitance circuits 54, and the third relays are electrically connected to the plurality of second relays, respectively. In this way, the circuit structure can be simplified and the circuit area can be reduced.

Fig. 9 shows only one polarization voltage control circuit 34 and polarization voltage generating circuit 33 in this embodiment; the polarization voltage is essentially a dc bias voltage of a certain magnitude, and can be obtained by a dc power supply such as an alkaline battery through a certain voltage division regulation.

In order to ensure the normal operation of the second relay, a second driving circuit (not shown) may be further provided, and is electrically connected to the control circuit 72 and the second relay, and is configured to drive the second relay to operate under the control of the control circuit 72.

A driving circuit can be arranged for the third relay to ensure the third relay to work normally.

Alternatively, as shown in fig. 10, the mode switching circuit 50 of the present embodiment includes: and a fourth relay, wherein a control end 8 of the fourth relay is electrically connected with the control circuit 72 (specifically, the main controller circuit 10), a first fixed contact 2 of the fourth relay is in idle connection (a port A1 is in idle connection), a second fixed contact 4 of the fourth relay is electrically connected with an access test signal (connected with a port A2 of the signal generating circuit 60), and a movable contact 3 of the fourth relay is electrically connected with the resistance-capacitance network 31 (connected with a port A3 of the resistance-capacitance network 31).

In other embodiments, a relay having only two stationary contacts and one movable contact may be selected.

The main controller circuit 10 controls the switching of the noise test and the signal test through the control terminal 8 of the fourth relay. Specifically, the second stationary contact 4 of the fourth relay is electrically connected to the signal generating circuit 60.

When a noise test is carried out, the movable contact 3 of the fourth relay is conducted with the first fixed contact 2, and the first fixed contact 2 is in idle connection because the noise test defined in the standard is not connected with any signal; when the common mode rejection capability and the polarization-resistant voltage are tested, the movable contact 3 of the fourth relay is conducted with the second fixed contact 4, and a test signal is accessed; the control end 8 of the fourth relay outputs high and low levels through the main controller circuit 10 for control, the fourth relay is connected to the first stationary contact 2 by default to output a noise signal, and when the fourth relay acts, the fourth relay is connected to the second stationary contact 4 to output a test signal.

A driving circuit can be arranged for the fourth relay to ensure the normal work of the fourth relay.

Different from the prior art, the embodiment uses the relay to realize the lead switch in the test circuit, and controls the action of the relay through the controller circuit, so that the test required by the standard can be completed.

Regarding the working principle of the relay, when the control end 8 is connected with a control signal, the movable contacts 3 and 6 of the relay are attracted and conducted with the fixed contacts 2 and 7 close to the control end 8, otherwise, the movable contacts 3 and 6 of the relay are attracted and conducted with the fixed contacts 4 and 5 far from the control end 8.

In other embodiments, an analog switch, a power tube switch, or the like may be used instead of the second to fourth relays.

The application further provides a testing method of the electrocardio equipment, which is used for the testing device of the electrocardio equipment. As shown in fig. 11, the testing method of the present embodiment includes the following steps:

step S11: the main controller circuit obtains a test requirement and at least generates a first control signal according to the test requirement.

The test requirements comprise a signal test and a noise test; the test requirement also tests information such as standards; the test requirements also include information such as start, stop and test duration of the test device.

Step S12: the slave controller circuit operates under control of a first control signal.

The slave controller circuit controls the detection circuit to perform performance test on the electrocardio equipment under the control of the master controller circuit.

Step S13: the detection circuit adjusts the circuit structure of the detection circuit under the control of the slave controller circuit, so that the adjusted detection circuit converts the test signal into different branch signals, and different performance parameters of the electrocardio equipment are tested by using the different branch signals.

Responding to the test requirement of noise test, controlling the detection circuit not to access the test signal by the master controller circuit, and adjusting the circuit structure of the detection circuit by the slave controller circuit based on the standard requirement of the noise test; and responding to the test requirement as a signal test, controlling the detection circuit to access the test signal by the master controller circuit, and adjusting the circuit structure of the detection circuit by the slave controller circuit based on the standard requirement of the signal test.

The signal test comprises a common mode rejection test and a polarization-resistant voltage test, and the slave controller circuit controls one or more resistance-capacitance circuits in the detection circuit to access test signals based on the standard requirement of the common mode rejection test so as to perform the common mode rejection test on the electrocardio equipment; and responding to the completion of the common mode rejection test, and controlling the resistance-capacitance circuit connected with the test signal in the detection circuit to be connected with the polarization voltage by the slave controller circuit based on the standard requirement of the polarization voltage resistance test so as to carry out the polarization voltage resistance test on the electrocardio equipment.

The detection circuit adjusts the condition of connecting the resistance-capacitance network and the polarization voltage in each lead under the control of the slave controller circuit, so that the adjusted detection circuit meets the requirement of the test standard.

The test method of the present embodiment may further refer to the working principle of the test circuit.

The application further provides a testing method of an electrocardiograph device according to another embodiment, which is used for the testing apparatus of the electrocardiograph device, as shown in fig. 12, the testing method of the embodiment includes: after starting up, initializing the system, and defaulting to have no test signal output and no polarized voltage access; a user selects to carry out a noise test, a common mode rejection capability or a polarization resistant voltage test according to the test requirements; if the noise test is carried out, the test signal input is cut off according to the standard requirement, and the lead electrodes are all connected together through a resistance-capacitance network for testing; if the common mode rejection capability or the polarization-resistant voltage is tested, a test signal is accessed according to the standard requirement; the user can select a manual control test or an automatic control test; for the manual control test, if the common mode rejection ratio test is carried out, the unbalanced impedance is accessed to the corresponding lead according to the selection of a user for testing; if the polarization voltage resistance test is carried out, the corresponding polarization voltage is accessed for testing after the unbalanced impedance is accessed to the corresponding lead according to the selection of a user; for automatic control testing, a user sets automatic parameters as required, including testing time of each lead, whether polarization-resistant voltage testing is performed or not, and the like, and then an automatic program automatically controls operation to perform testing according to the setting.

Different from the prior art, the testing method and the testing device have the advantages that the testing device adopts the main controller circuit and the sub-controller circuit which are in communication connection to realize the control of the performance parameter testing of the electrocardiograph equipment, and the detection circuit is electrically isolated from the main controller circuit, so that part of control circuits, namely the noise interference of the main controller circuit to the detection circuit, can be effectively reduced, a cleaner testing environment can be obtained, the anti-interference performance of the testing device can be improved, and the accuracy and the repeatability of a testing result can be improved; and the test required by the standard is automatically controlled and completed through the main controller circuit and the slave controller circuit, manual complex operation is not needed in the test process, the production efficiency of a production line can be improved, the training difficulty of operators is reduced, the integrated level and the reliability of the test circuit are high, and the accuracy and the repeatability of a test result can be effectively improved. Therefore, the method and the device can realize the full-automatic test of the electrocardio equipment, improve the anti-interference capability of the electrocardio equipment and further improve the accuracy and the repeatability of the performance test of the electrocardio equipment.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent mechanisms or equivalent flow transformations that are applied to the contents of the specification and the drawings, or are directly or indirectly applied to other related technical fields are also included in the scope of the present application.

Claims (10)

1. A test circuit for an electrocardiograph device, comprising:

a control circuit for generating a control signal corresponding to the test requirement;

the resistance-capacitance network is used for accessing a test signal and is electrically connected with the electrocardio equipment, and the resistance-capacitance network consists of a plurality of resistance-capacitance circuits;

the first relay is respectively electrically connected with the control circuit and the resistance-capacitance circuits and is used for selecting one or more resistance-capacitance circuits from the resistance-capacitance network to form a test circuit under the control of the control signal so that the test circuit outputs branch signals corresponding to the test requirements and different performance parameters of the electrocardio equipment are tested by using the different branch signals;

and the polarization voltage control circuit is respectively electrically connected with the control circuit, the first relay and the electrocardio equipment and is used for selectively connecting the polarization voltage to a selected branch circuit between the resistance-capacitance circuit and the electrocardio equipment under the control of the control signal so as to realize the common mode rejection test or the polarization voltage resistance test of the electrocardio equipment.

2. The test circuit of claim 1, wherein the resistance-capacitance circuit comprises:

one end of the capacitor is connected with the test signal, and the other end of the capacitor is electrically connected with the electrocardio equipment;

a resistor, one end of which is electrically connected to the one end of the capacitor and the other end of which is connected to the other end of the capacitor;

the control end of the first relay is electrically connected with the control circuit, the static contact of the first relay is electrically connected with the other end of the capacitor, and the movable contact of the first relay is electrically connected with one end of the capacitor.

3. The test circuit of claim 1, further comprising:

a polarization voltage generating circuit for generating the polarization voltage;

the polarization voltage control circuit is respectively and electrically connected with the resistance-capacitance network, the control circuit, the polarization voltage generating circuit and the electrocardio equipment, and is used for selectively connecting the polarization voltage generating circuit in series between the selected resistance-capacitance circuit and the electrocardio equipment under the control of the control signal so as to realize the common mode rejection test or the polarization voltage resistance test of the electrocardio equipment.

4. The test circuit of claim 3, wherein the polarization voltage control circuit comprises: the control end of the second relay is electrically connected with the control circuit, the first fixed contact of the second relay is electrically connected with the second fixed contact, the third fixed contact and the fourth fixed contact of the second relay are respectively electrically connected with the two electrodes of the polarization voltage generating circuit, the first movable contact of the second relay is electrically connected with the resistance-capacitance circuit, and the second movable contact of the second relay is electrically connected with the electrocardio equipment;

the control end controls the first movable contact to be electrically connected with the first fixed contact and the second movable contact to be electrically connected with the second fixed contact under the control of the control signal, or controls the first movable contact to be electrically connected with the third fixed contact and the second movable contact to be electrically connected with the fourth fixed contact.

5. The test circuit of claim 4, wherein the polarization voltage generation circuit comprises: a voltage source;

a third relay, a control end of which is electrically connected with the control circuit, a first fixed contact and a second fixed contact of which are respectively electrically connected with a positive pole of the voltage source, a third fixed contact and a fourth fixed contact of which are respectively electrically connected with a negative pole of the voltage source, a first movable contact of which is electrically connected with a third fixed contact of the second relay, and a second movable contact of which is electrically connected with a fourth fixed contact of the second relay;

and the control end of the third relay controls the first movable contact of the third relay to be electrically connected with the first fixed contact of the third relay and the second movable contact of the third relay to be electrically connected with the fourth fixed contact of the third relay under the control of the control signal, or controls the first movable contact of the third relay to be electrically connected with the third fixed contact of the third relay and the second movable contact of the third relay to be electrically connected with the second fixed contact of the third relay.

6. The test circuit according to claim 5, wherein the polarization voltage control circuit includes a plurality of the second relays, the polarization voltage generating circuit includes one of the third relays, the plurality of the second relays are provided in one-to-one correspondence with the plurality of the resistance-capacitance circuits, and the third relays are electrically connected to the plurality of the second relays, respectively.

7. The test circuit of any one of claims 1 to 6, further comprising: and the signal generating circuit is respectively electrically connected with the control circuit and the resistance-capacitance network and is used for acquiring the signal parameters of the test signals from the control circuit and generating the test signals corresponding to the signal parameters.

8. The test circuit of claim 7, further comprising: and the mode switching circuit is respectively electrically connected with the control circuit, the signal generating circuit and the resistance-capacitance network, and is used for disconnecting or connecting the electrical connection between the signal generating circuit and the resistance-capacitance network under the control of the control circuit so as to realize the noise test or the signal test of the electrocardio equipment, wherein the test signal comprises the common mode rejection test and the polarization-resistant voltage test.

9. The test circuit of claim 8, wherein the mode switching circuit comprises: and the control end of the fourth relay is electrically connected with the control circuit, the first static contact of the fourth relay is in idle connection, the second static contact of the fourth relay is electrically connected with the signal generating circuit, and the moving contact of the fourth relay is electrically connected with the resistance-capacitance network.

10. The test circuit of claim 4, further comprising:

the first driving circuit is electrically connected with the control circuit and the first relay and is used for driving the first relay to act under the control of the control circuit;

and the second driving circuit is electrically connected with the control circuit and the second relay and is used for driving the second relay to act under the control of the control circuit.

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