CN104013398B - Multi-parameter physiology signal simulator self-checking device - Google Patents
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Abstract
Multi-parameter physiology signal simulator self-checking device, be for solve at present measurement and calibration is carried out to electrocardiosignal or multi-parameter physiology signal simulator time, owing to adopting the mode of building temporarily, its swinging of signal, cannot realize amplification adjustment, there is efficiency, precision is low, unstable properties and the technical problem such as cannot to trace to the source design.By adopt signal input interface directly be calibrated simulator and be connected and carry out measurement and calibration by calibrating output interface to being calibrated simulator, realize tracing to the source to time, voltage reference, by being calibrated the frequency of simulator, voltage multiparameter traces to the source and to be connected with upper computer to national measurement standard and by communication interface, makes calibration data directly change into calibration record and preserve.Beneficial effect: this apparatus structure is compact, calibration process simple, need not relend and help the multiple auxiliary facilities such as oscillograph, enumerator.There is the features such as integrated level is high, accuracy is high, certainty of measurement is high, full automatic working, fully achieve possessing comprehensive measurement and calibration of multi-parameter physiology signal simulator and tracing to the source.
Description
Technical field:
The present invention relates to a kind of physiological signal simulator calibrating installation, particularly relate to a kind of multi-parameter physiology signal simulator self-checking device.This device can carry out measurement and calibration to the key parameter such as heart rate, amplitude that electrocardiosignal simulators all at present and the multiparameter simulator possessing electrocardiosignal output function export, and calibration result is traced to the source to the temporal frequency of country and voltage standard.
Background technology:
Electrocardiograph is used to the instrument of the electro-physiological signals produced when recording cardiomotility.Because its diagnosis is reliable, easy and simple to handle, to plurality of advantages such as patient's not damageds, become one of medical electronic diagnostic instruments the most universal in hospital.In order to ensure the reliability of its clinical diagnosis, need regularly to detect with regard to its technical performance electrocardiosignal simulator or the multiparameter simulator that possesses this function.But it is reported current China also not for electrocardiosignal simulator or the calibrating installation of multiparameter simulator possessing this function.When carrying out measurement and calibration to electrocardiosignal simulator or the multiparameter simulator that possesses this function, adopt special difference amplifier, wave filter be aided with oscillographic mode more.This version of temporarily building, although can calibrate electrocardiosignal simulator, there are the following problems:
1, adopt separate devices, use the amplifying circuit that wire is built temporarily, its amplification can change greatly with the increase of signal frequency, can impact the amplitude calibration result of electrocardiosignal simulator or the multiparameter simulator output signal possessing this function;
2, the output signal amplitude of electrocardiosignal simulator or the multiparameter simulator that possesses this function is divided into usually: 50uV, 100uV, 200uV, 500uV, 1mV, 2mV etc., for different amplitudes, need different amplifications, the amplifying circuit temporarily built is difficult to possess amplification adjustment function, uses it to carry out calibration adjustment cumbersome;
3, oscillograph is utilized to observe the analog electrocardiogram signal after amplification, need measure by the generation cycle of cursor function (cursor) to electrocardiosignal, its efficiency is lower, and oscillographic time precision is lower, and the personal error of introducing is also larger;
4, owing to adopting the circuit built temporarily, its performance is difficult to stable, and traces to the source to it and also have problems; And in metering industry, the standard that cannot trace to the source cannot use.
Summary of the invention:
When the present invention carries out measurement and calibration to electrocardiosignal simulator or the multiparameter simulator that possesses this function for a long time in order to solve, the difference amplifier that many employings are special, wave filter is also aided with and oscillographicly builds mode temporarily, and the jitter existed, for different amplitudes, the amplifying circuit temporarily built cannot realize amplification adjustment, oscillograph need be observed by cursor and measures the generation cycle of electrocardiosignal the analog electrocardiogram signal after amplification, its efficiency is low, precision is low, unstable properties and the technical problem such as cannot to trace to the source, provide a kind of multi-parameter physiology signal simulator self-checking device, this device comprises cabinet and mainboard, the panel of described cabinet is provided with lcd screen, keyboard, on and off switch, the panel of described cabinet is also provided with communication interface, calibration output interface and signal input interface, they all with each corresponding module control connection on mainboard, described calibration output interface is made up of the output port of tracing to the source of trace to the source output port and the reference voltage module of constant temperature high stability crystal oscillator module, and constant temperature high stability crystal oscillator signal is led to cymometer by the output port of tracing to the source of described constant temperature high stability crystal oscillator module, the AD reference voltage signal of mainboard inside is led to digital multimeter by the output port of tracing to the source of described reference voltage module, by described signal input interface directly be calibrated simulator and be connected.
Feature of the present invention and beneficial effect: this apparatus structure is compact, accuracy is high, calibration process simply, no longer by the auxiliary facilities such as oscillograph, enumerator, and provide special trace to the source interface and communication interface with pc.Can trace to the source to national measurement standard from temporal frequency, voltage aspect, and by communication interface, make calibration data directly change into calibration record and preserve.There is the features such as integrated level is high, certainty of measurement is high, full automatic working, achieve and electrocardiosignal simulator or the multiparameter simulator that possesses this function are carried out comprehensive measurement and calibration and traced to the source.
Beneficial effect is in particular in:
1, measurement and calibration is carried out automatically to the parameter such as frequency, voltage of electrocardiosignal simulator or multi-parameter physiology signal simulator, and traced to the source to national measurement standard.
2, automatically calibration function is completed, at connection equipment to be checked after setting the output of electrocardiosignal simulator or multi-parameter physiology signal simulator, automatically measurement and calibration is carried out to the parameter such as amplitude, heart rate of the electrocardiosignal that it exports, by communication interface, calibration data is saved to computer simultaneously and also automatically generates the calibration record of Word form or calibration result is saved in connected USB flash disk.
3, use the constant temperature crystal oscillator with high stability OCXO8789 of Oscilloquartz company, its second surely can reach 1 × 10
-12, ageing rate is better than 5 × 10
-10/ sky;
4, the high-performance ARM chip STM32F103R of ST company is used, it possesses powerful data and interrupt processing function, after the frequency multiplier circuit using constant temperature crystal oscillator with high stability OCXO8789 and its inside, can realize the control of sampling with high precision time, certainty of measurement is better than 20ns.
Accompanying drawing illustrates:
Fig. 1 cabinet panel structural representation
Fig. 2 motherboard hardware structural representation;
Fig. 3 Signal-regulated kinase structural representation;
Fig. 4 heart rate Automatic measuring algorithm schematic diagram;
Fig. 5 T wave amplitude Automatic measuring algorithm schematic diagram;
Detailed description of the invention:
Referring to Fig. 1-Fig. 5, multi-parameter physiology signal simulator self-checking device, it comprises cabinet 1 and mainboard, the panel of described cabinet 1 is provided with lcd screen 2, keyboard 3, on and off switch 5, the panel of described cabinet 1 is also provided with communication interface 4, calibration output interface 6 and signal input interface 7, they all with each corresponding module control connection on mainboard; Described calibration output interface 6 is made up of the output port of tracing to the source of trace to the source output port and the reference voltage module 9 of constant temperature high stability crystal oscillator module 10, and constant temperature high stability crystal oscillator signal is led to cymometer by the output port of tracing to the source of described constant temperature high stability crystal oscillator module 10; The AD reference voltage signal of mainboard inside is led to digital multimeter by the output port of tracing to the source of described reference voltage module 9; By described signal input interface 7 directly be calibrated simulator and be connected.Wherein:
Described signal input interface 7 comprises C1, C2, C3, C4, C5, C6, RL, LL, RA and LA signal input interface;
Described calibration output interface 6, comprises VR+, VR-, CR+, CR-tetra-interfaces.Wherein VR+, VR-export for the reference voltage of D/A converter module, and CR+, CR-are used for the output of constant temperature high stability crystal oscillator module references frequency;
Described mainboard is made up of Signal-regulated kinase 8, reference voltage module 9, constant temperature high stability crystal oscillator module 10, MCU module 11, RAM module 12, liquid crystal driver module 13, power module 14, communication module 15, Keyboard drive module 16, Keysheet module 17, display module 18 and analog-to-digital conversion module 19, is all connected by circuit between each module;
Described Signal-regulated kinase 8 comprises overvoltage crowbar 20, instrument amplifier circuit 21, baseband signal secondary filtering and amplifying circuit 22, baseband signal three grades of filtering and amplifying circuits 23 and common-mode voltage and suppresses circuit 24 and relay network 25, is all connected by circuit between each circuit.Wherein:
Described overvoltage crowbar 20,36 audions encapsulated by TO-92A are formed;
Described instrument amplifier circuit 21, the INA114 chip encapsulated by straight cutting is formed;
Described baseband signal secondary filtering and amplifying circuit 22 and described baseband signal three grades of filtering and amplifying circuits 23, the LM358 by SOP encapsulation is formed; Wherein: described baseband signal secondary filtering and amplifying circuit 22, the precision resistance being 0.1% by LM358 and precision forms forward amplifying circuit, high pass filter and low pass filter all by 0.1% precision resistance and the passive filter circuit that forms of electric capacity; Described baseband signal three grades of filtering and amplifying circuits 23, form KRC wave filter by the precision resistance of LM358 and 0.1% and electric capacity;
Described common-mode voltage suppresses circuit 24, and the LM358 encapsulated by SOP is formed, and utilizes negative feedback, reaches 50dB restraint;
Described relay network 25, realizes electrocardiosignal I lead connection, the III of connection, II that lead by the folding of relay and to lead the electrocardiosignal connected mode of connection and chest electrode connection.
Described communication module 15 is connected with computer by USB connecting line.
Below in conjunction with accompanying drawing and instantiation, multi-parameter physiology signal simulator self-checking device is described further.
Multi-parameter physiology signal simulator self-checking device comprises: cabinet and mainboard two parts.
Referring to Fig. 1, the panel of described cabinet 1 is provided with lcd screen 2, keyboard 3, communication interface 4, on and off switch 5, calibration output interface 6 and signal input interface 7, and they are all connected with the mainboard in cabinet by winding displacement.
Described signal input interface 7 comprises C1, C2, C3, C4, C5, C6, RL, LL, RA and LA totally 10 signals, these interfaces all adopt Fructus Musae joint (female form), by Fructus Musae head connecting line be calibrated simulator and be directly connected (as: electrocardiosignal simulator, multi-parameter physiology signal simulator).Wherein C1 ~ C6 is chest electrode connecting interface, and RL is right lower limb Electrode connection interface, and LL is left lower limb Electrode connection interface, and RA is right arm electrode connecting interface, and LA is left arm electrode connecting interface.
Described calibration output interface 6 comprises trace to the source output port and reference voltage of constant temperature high stability crystal oscillator and to trace to the source output port, all adopts BNC connector (female form).Constant temperature high stability crystal oscillator traces to the source output port for constant temperature high stability crystal oscillator signal is led to cymometer, and then traces to the source to the time reference being calibrated simulator.Wherein, the CR+ output lead of the constant temperature high stability crystal oscillator module 10 on mainboard is connected with the heart yearn of BNC connector, and CR-lead-in wire is connected with the shielding line of BNC connector; Reference voltage traces to the source output port for inner for mainboard 2.5VAD reference voltage signal is led to digital multimeter, and then traces to the source to the voltage reference being calibrated simulator.The VR+ output lead of the reference voltage module 9 wherein on mainboard is connected with the heart yearn of BNC connector, and VR-lead-in wire is connected with the shielding line of BNC connector.
Referring to Fig. 2, described mainboard comprises: Signal-regulated kinase 8, reference voltage module 9, constant temperature high stability crystal oscillator module 10, MCU module 11, RAM module 12, liquid crystal driver module 13, power module 14 (POWER), communication module 15, Keyboard drive module 16, Keysheet module 17, display module 18, analog-to-digital conversion module 19, connected by circuit between each module.Wherein:
Described Signal-regulated kinase 8 comprises overvoltage crowbar 20, instrument amplifier circuit 21, baseband signal secondary filtering and amplifying circuit 22, baseband signal three grades of filtering and amplifying circuits 23, common-mode voltage suppression circuit 24 and relay network 25, is all connected by circuit between each circuit.This Signal-regulated kinase 8 possesses enlarging function able to programme, and its amplification is respectively 660,1260 and 6060 times, and free transmission range is 0.1Hz-300Hz, and 1kHz place noise voltage (RTI) of converting input is only
36 audions that described overvoltage crowbar 20 is encapsulated by TO-92A are formed;
The INA114 chip that described instrument amplifier circuit 21 is encapsulated by straight cutting is formed;
The LM358 that described baseband signal secondary filtering and amplifying circuit 22 is encapsulated by SOP is formed, wherein LM358 and precision be 0.1% precision resistance form forward amplifying circuit, high pass filter and low pass filter all by 0.1% precision resistance and the passive filter circuit that forms of electric capacity;
The LM358 that described baseband signal three grades of filtering and amplifying circuits 23 are encapsulated by SOP is formed, and wherein the precision resistance of LM358 and 0.1% and electric capacity form KRC wave filter, have had filtering characteristic while possessing enlarging function concurrently;
The LM358 that described common-mode voltage suppresses circuit 24 to be encapsulated by SOP is formed, and utilizes negative-feedback principle, reaches the common-mode voltage rejection ability of 50dB;
Described relay network 25 possesses the networking of input signal path and controlling functions, realize electrocardiosignal I lead connection, the III of connection, II that lead by the folding of relay to lead connection, the multiple electrocardiosignal connected mode of chest electrode connection, be made up of the silver contact of Omron, low thermoelectrical potential solid-state relay G6AK-274P;
Described reference voltage module 9 has for analog-digital converter provides the function of 2.5V reference voltage, and the TL341 chip encapsulated by TO-92A is formed, and is led to voltage calibration port by the auxiliary circuit be made up of precision resistance, the electric capacity of 0.1%;
Described constant temperature high stability crystal oscillator module 10 has 10MHz rate-adaptive pacemaker function, and second surely can reach 1 × 10
-12, ageing rate is better than 5 × 10
-10/ sky, makes interval measuring accuracy be better than 20ns, and the constant temperature crystal oscillator with high stability OCXO8789 primarily of Oscilloquartz company is formed;
Complete control to other modules and coordination function by described MCU module 11, the ARM chip STM32F103R that this module is encapsulated by 64 pin LQFP is formed, and this chip internal is integrated with DMA function, for high speed acquisition provides safeguard;
Described communication module 15 has USB communication function, the CH373 chip encapsulated by SOP is formed, meet USB2.0 protocol requirement, be connected with computer by USB connecting line, it is made to possess main usb function, by USB flash disk, data are preserved with CSV form by communication interface 4, can also externally provide the electric current being 1000mA to the maximum;
Described power module 14 has+5V, the output function of 3.3V and 12V, it primarily of TO220 encapsulation 7805 chips, 7905 chips, SOT encapsulation LM2937 chip and possess 12V, 3A export on and off switch 5 form;
Described RAM module 12 has sampled data memory function, and the IS61LV25616 encapsulated by TSOP is formed, and has the capacity of 512k × 16bit, can store the signal of 16s;
Described liquid crystal driver module 13 has the effect improving MCU module I/O interface fan-out capability and protection MCU module I/O interface, and the 75LS245 encapsulated by SOP is formed;
Described display module 18 possesses the TFT LCD screen of 640X480 resolution, is made up of NH056DN03 color liquid crystal screen;
Described Keyboard drive module 16 possesses hardware stabilization and interrupt output function, and the 74LS164 chip of BC7281, the SOP encapsulated by DIP encapsulation forms;
Analog-digital conversion circuit as described 19 possesses the precision of 16, signal after Signal-regulated kinase is carried out analog digital conversion under the control of MCU module, and then become digital quantity, then be directly stored in RAM module by the DMA passage of MCU module, the AD7683 chip that analog to digital conversion circuit is encapsulated by SOP is formed.
By reference to the accompanying drawings work process of the present invention is further described:
Referring to Fig. 2, signal measurement some work principle: the signal after electrocardiosignal conditioning module, directly enters analog-to-digital conversion module A/D, and carries out digitized under the control of MCU module.MCU module is controlled analog-to-digital conversion module by control bus CB1, and by data/address bus DB by the digital independent after conversion out, and then by dma mode, the data read out directly are stored to RAM module and keep in by usage data bus DB and control bus CB2.This RAM module has the memory space of 512kB, and the picking rate of analog-to-digital conversion module is 4000Hz, it can thus be appreciated that the longest electrocardiosignal that can record duration and be about 136s of this device simultaneously.For the data be temporarily stored in RAM module, can process data voluntarily, to obtain amplitude (voltage difference of its maximum and baseline) and the heart rate of electrocardiosignal simulator or multi-parameter physiology signal simulator output electrocardiosignal.If directly use USB flash disk on this device, MCU module is controlled communication module by control bus CB3, by calibration result directly stored in USB flash disk; If this device is connected to computer by USB, calibration result is uploaded to computer by control bus CB3 by MCU module, and generates the calibration record of word form by the relative program in computer.MCU module to be controlled Keyboard drive module by control bus CB3 and reads, and key information is read to MCU.MCU module is read and write display module by control bus CB3x and data/address bus DB, controls the display of display module.MCU module is controlled the relay network in Signal-regulated kinase by control bus CB4, and what relay network is switched to specify leads.
Referring to Fig. 3, the operation principle of Signal-regulated kinase: this module mainly complete to electrocardiosignal simulator or multi-parameter physiology signal simulator output signal amplification, filter function.Because the output signal of electrocardiosignal simulator or multi-parameter physiology signal simulator is similar to the structure of human ecg signal network, in order to accurate-metering, this module also adopts the structure of similar electrocardiograph.The signal that electrocardiosignal simulator or multi-parameter physiology signal simulator export; after relay network control circui and networking, form standard lead connected mode, then enter overvoltage crowbar respectively; to remove too high voltage, prevent from causing damage to amplifier.The structure of overvoltage crowbar as shown in Figure 4, forms primarily of triode array, when the reasons such as electrostatic cause input signal excessive, can be limited between+2V by signal, protect instrument amplifier module.At present, conventional overvoltage crowbar forms primarily of general-purpose diode, but the leakage current of general-purpose diode is comparatively large, can introduce more noise jamming for detection system; The triode array structure adopted in this device, also reduces leakage current while reaching overvoltage protection object, thus improves the signal processing and amplifying ability of device.Signal through overvoltage crowbar will enter instrument amplifier circuit, and the difference mode signal of this circuit to input amplifies, and has the common mode disturbances rejection ability up to 110dB.The amplification of this circuit is fixed as 6 times, and the signal through instrument amplifier circuit removes flip-flop, to prevent follow-up amplifier saturation through simple high pass filter again.The signal removing flip-flop enters baseband signal secondary filtering and amplifying circuit again, is made up of amplifier and wave filter.The amplification of this circuit can be 11 times, 21 times and 101 times, amplitude after being amplified according to reality by MCU module controls, the amplification of this module is variable, determined by the output signal of electrocardiosignal simulator or multi-parameter physiology signal simulator, use controlled amplification, to ensure the sensitivity of this device.After this circuit, signal enters baseband signal three grades of filtering and amplifying circuits again, and structure and the baseband signal secondary filtering and amplifying circuit of this circuit are similar, and just its amplification is fixed as 10 times, and uses KRC wave filter, and its cut-off frequency is 0.3kHz.Because analog electrocardiogram signal can produce stronger common mode disturbances, in order to reach better signal condition effect, this device have employed common-mode voltage and suppresses circuit to improve the common mode inhibition capacity of electrocardiosignal conditioning module.Common-mode voltage suppresses circuit to adopt degenerative principle to design, and can realize the common mode inhibition capacity of nearly 300 times (i.e. 50dB), improve the performance of electrocardiosignal conditioning module.Through the process of above circuit, the small-signal that electrocardiosignal simulator or multi-parameter physiology signal simulator export is amplified to more than 0.2V, for the digitized of analog-to-digital conversion module provides guarantee by electrocardiosignal modulate circuit.R in Fig. 3
1a, R
2a, R
3a, R
t, R
1b, R
2b, R
3b, R
0, R
1and C
1bbe respectively the resistance in Signal-regulated kinase, electric capacity label, the principle for instrument amplifier circuit is illustrated.
Referring to Fig. 4, Fig. 5, the operation principle of Digital Signal Processing: analog-digital converter module is under the control of MCU module, utilize dma mode by digitized for analog-to-digital conversion module data conversion storage in RAM module, after data acquisition completes, MCU module will process the digital signal in RAM module.For electrocardiosignal simulator or multi-parameter physiology signal simulator, the analog electrocardiogram signal exported mainly contains amplitude and heart rate two indexs.For the calibration of heart rate, adopt the mode of searching T crest value, find by the T crest value point in digital signal, and record its subscript, then, do poor mode by adjacent subscript value, calculate the sampling interval number between adjacent two T crest values, again by being multiplied with sampling interval 0.25ms, obtain the cycle T of electrocardiosignal
1, T
2... T
x, then using the cycle T s of their averages as analog electrocardiogram signal, then calculated the heart rate of analog electrocardiogram signal by 60/Ts.Calibration (referring to Fig. 5) for amplitude: the T crest value point that utilization is found above, baseline is searched between adjacent two T crest value points, and record corresponding analog electrocardiogram signal base line value, using this baseline value and with the difference of its T crest value be closely connected as electrocardio amplitude, carry out obtaining A
1, A
2... A
x, using the amplitude As of their average as analog electrocardiogram signal, then calculated the amplitude (G is the amplification of demarcating) of this analog electrocardiogram signal by As/G.
To voltage, frequency trace to the source (referring to Fig. 2).By reference to voltage module with constant temperature high stability crystal oscillator module carries out voltage and the time traces to the source.The digitized of analog-to-digital conversion module is that voltage reference carries out with reference voltage module, traces to the source to the output voltage of reference voltage module, just can realize tracing to the source to analog digital conversion performance.Time reference, all based on constant temperature high stability crystal oscillator module, by tracing to the source to high stability crystal oscillator module, just can be traced to the source by the time reference of whole device.By the sinusoidal signal to baseband signal input port LA, RA end input known amplitude and frequency, just can the signal condition performance of the electrocardiosignal conditioning module of this device be calibrated and be traced to the source.
Claims (10)
1. multi-parameter physiology signal simulator self-checking device, it comprises cabinet (1) and mainboard, the panel of described cabinet (1) is provided with lcd screen (2), keyboard (3), on and off switch (5), it is characterized in that: on the panel of described cabinet (1), be also provided with communication interface (4), calibration output interface (6) and signal input interface (7), they all with each corresponding module control connection on mainboard; Described calibration output interface (6) is made up of the output port of tracing to the source of trace to the source output port and the reference voltage module (9) of constant temperature high stability crystal oscillator module (10), and constant temperature high stability crystal oscillator signal is led to cymometer by the output port of tracing to the source of described constant temperature high stability crystal oscillator module (10); The AD reference voltage signal of mainboard inside is led to digital multimeter by the output port of tracing to the source of described reference voltage module (9); By described signal input interface (7) directly be calibrated simulator and be connected.
2. multi-parameter physiology signal simulator self-checking device according to claim 1, is characterized in that: described signal input interface (7) comprises C1, C2, C3, C4, C5, C6, RL, LL, RA and LA.
3. multi-parameter physiology signal simulator self-checking device according to claim 1, it is characterized in that: described calibration output interface (6) comprises VR+, VR-, CR+, CR-tetra-interfaces, wherein VR+, VR-export for the reference voltage of D/A converter module, and CR+, CR-are used for the output of constant temperature high stability crystal oscillator module references frequency.
4. multi-parameter physiology signal simulator self-checking device according to claim 1, it is characterized in that: described mainboard is made up of Signal-regulated kinase (8), reference voltage module (9), constant temperature high stability crystal oscillator module (10), MCU module (11), RAM module (12), liquid crystal driver module (13), power module (14), communication module (15), Keyboard drive module (16), Keysheet module (17), display module (18) and analog-to-digital conversion module (19), is all connected by circuit between each module.
5. multi-parameter physiology signal simulator self-checking device according to claim 4; it is characterized in that: described Signal-regulated kinase (8) comprises overvoltage crowbar (20), instrument amplifier circuit (21), baseband signal secondary filtering and amplifying circuit (22), baseband signal three grades of filtering and amplifying circuits (23) and common-mode voltage and suppresses circuit (24) and relay network (25), is all connected by circuit between each circuit.
6. multi-parameter physiology signal simulator self-checking device according to claim 5, it is characterized in that: described overvoltage crowbar (20), at least 4 audions encapsulated by TO-92A are formed.
7. multi-parameter physiology signal simulator self-checking device according to claim 5, it is characterized in that: described instrument amplifier circuit (21), the INA114 chip encapsulated by straight cutting is formed.
8. multi-parameter physiology signal simulator self-checking device according to claim 5, it is characterized in that: described baseband signal secondary filtering and amplifying circuit (22) and described baseband signal three grades of filtering and amplifying circuits (23), the LM358 by SOP encapsulation is formed; Wherein: described baseband signal secondary filtering and amplifying circuit (22), the precision resistance being 0.1% by LM358 and precision forms forward amplifying circuit, high pass filter and low pass filter all by 0.1% precision resistance and the passive filter circuit that forms of electric capacity; Described baseband signal three grades of filtering and amplifying circuits (23), form KRC wave filter by the precision resistance of LM358 and 0.1% and electric capacity.
9. multi-parameter physiology signal simulator self-checking device according to claim 5, is characterized in that: described common-mode voltage suppresses circuit (24), and the LM358 encapsulated by SOP is formed, and utilizes negative feedback, reaches 50dB restraint.
10. multi-parameter physiology signal simulator self-checking device according to claim 5, it is characterized in that: described relay network (25), realize electrocardiosignal I lead connection, the III of connection, II that lead by the folding of relay and to lead the electrocardiosignal connected mode of connection and chest electrode connection.
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| RU179919U1 (en) * | 2018-03-13 | 2018-05-29 | Общество с ограниченной ответственностью (ООО) "Альтомедика" | Simulator for metrological verification and testing of electrocardiographs |
| CN109490663B (en) * | 2018-10-26 | 2021-03-19 | 北京无线电计量测试研究所 | Crystal resonator test system and calibration method |
| CN110048721B (en) * | 2019-03-12 | 2023-06-02 | 深圳数联天下智能科技有限公司 | Signal simulator, signal simulation method, signal simulation device, computer equipment and storage medium |
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| CN114469125B (en) * | 2022-02-17 | 2024-04-05 | 浙江荣泰健康电器有限公司 | Electrocardiogram calibration system, method, equipment and storage medium |
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