CN104013398A - Automatic calibration device for multi-parameter physiological signal simulator - Google Patents
Automatic calibration device for multi-parameter physiological signal simulator Download PDFInfo
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Abstract
The invention provides an automatic calibration device for a multi-parameter physiological signal simulator. The automatic calibration device is designed in order to solve the technical problems that when measurement calibration is performed on an electrocardiosignal simulator or a multi-parameter physiological signal simulator at present, as a makeshift way is adopted, the signal is not stabilized, amplification factors cannot be adjusted, efficiency and precision are low, performance is unstable, and tracing is not available. According to the automatic calibration device, a signal input interface is directly connected with the calibrated simulator, and measurement calibration is performed on the calibrated simulator through a calibration output interface; tracing can be performed on time and voltage reference, multiple parameters such as the frequency and voltage of the calibrated simulator are traced to national measurement standards, and a communication interface is connected with an upper computer so that calibration data can be directly converted into a calibration record and saved. The automatic calibration device has the advantages that the structure of the device is compact, the calibration process is simple, and various auxiliary devices such as an oscilloscope and a counter do not need to be used; the device is of a high integration degree, high accuracy, high measurement precision, full-automatic operation and the like; in this way, the overall measurement calibration and tracing on the multi-parameter physiological signal simulator are completely achieved.
Description
Technical field:
The present invention relates to a kind of physiological signal simulator calibrating installation, relate in particular to a kind of multi-parameter physiology signal simulator self-checking device.The key parameter such as heart rate, amplitude that this device can be exported at present all electrocardiosignal simulators and the multiparameter simulator that possesses electrocardiosignal output function carries out measurement and calibration, and calibration result is traced to the source to national temporal frequency and voltage standard.
Background technology:
Electrocardiograph is the instrument of the electro-physiological signals that produces 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 electrocardiosignal simulator or the multiparameter simulator that possesses this function to detect with regard to its technical performance.But it is reported that current China is not also for electrocardiosignal simulator or possess the calibrating installation of the multiparameter simulator of this function.In the time that electrocardiosignal simulator or the multiparameter simulator that possesses this function are carried out to measurement and calibration, adopt special difference amplifier, wave filter more and be aided with oscillographic mode.This version of temporarily building, although can calibrate electrocardiosignal simulator, there are the following problems:
1, adopt separate devices, use the amplifying circuit temporarily built of wire, its amplification can change greatly with the increase of signal frequency, can impact electrocardiosignal simulator or the amplitude calibration result that possesses the multiparameter simulator output signal of this function;
2, electrocardiosignal simulator or the output signal amplitude that possesses the multiparameter simulator of this function are divided into conventionally: 50uV, 100uV, 200uV, 500uV, 1mV, 2mV etc., for different amplitudes, need different amplifications, the amplifying circuit of temporarily building be difficult to possess amplification adjust function, use its calibrate adjustment cumbersome;
3, utilize oscillograph to observe the analog electrocardiogram signal after amplifying, need measure the generation cycle of electrocardiosignal by cursor function (cursor), 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 of building temporarily, its performance is difficult to stable, and to its also existing problems of tracing to the source; 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 in order to solve for a long time to electrocardiosignal simulator or the multiparameter simulator that possesses this function, the special difference amplifier of many employings, wave filter is also aided with the oscillographic mode of temporarily building, and the jitter existing, for different amplitudes, the amplifying circuit of temporarily building cannot be realized amplification adjustment, oscillograph need be observed and the generation cycle of electrocardiosignal is measured by cursor the analog electrocardiogram signal after amplifying, its efficiency is low, precision is low, unstable properties and the technical problem such as cannot trace to the source, a kind of multi-parameter physiology signal simulator self-checking device is provided, this device comprises cabinet and mainboard, on the panel of described cabinet, be provided with lcd screen, keyboard, on and off switch, on the panel of described cabinet, be also provided with communication interface, calibration output interface and signal input interface, they all with mainboard on each corresponding module control connection, 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 compactness, accuracy are 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 criteria 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, realized 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, the parameter such as frequency, voltage of electrocardiosignal simulator or multi-parameter physiology signal simulator is carried out to measurement and calibration automatically, and traced to the source to national measurement criteria.
2, automatically complete calibration function, connect equipment to be checked and set electrocardiosignal simulator or the output of multi-parameter physiology signal simulator after, automatically the parameter such as amplitude, heart rate of the electrocardiosignal to its output is carried out measurement and calibration, by communication interface, calibration data is saved to computer and automatically generates the calibration record of Word form or calibration result is saved in connected USB flash disk simultaneously.
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/ day;
4, use the high-performance ARM chip STM32F103R of ST company, it possesses powerful data and interrupts processing capacity, using after constant temperature crystal oscillator with high stability OCXO8789 and its inner frequency multiplier circuit, can realize the control of sampling with high precision time, certainty of measurement is better than 20ns.
Brief description of the drawings:
Fig. 1 cabinet panel structural representation
Fig. 2 motherboard hardware structural representation;
Fig. 3 signal condition modular structure schematic diagram;
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, on the panel of described cabinet 1, be provided with lcd screen 2, keyboard 3, on and off switch 5, 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 mainboard on each corresponding module control connection; 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+, tetra-interfaces of CR-.Wherein VR+, VR-are for the reference voltage output of D/A converter module, and CR+, CR-are for the output of constant temperature high stability crystal oscillator module references frequency;
Described mainboard is made up of signal condition module 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, between each module, all connects by circuit;
Described signal condition module 8 comprises that overvoltage crowbar 20, instrument amplifier circuit 21, baseband signal secondary filtering and amplifying circuit 22, three grades of filtering and amplifying circuits 23 of baseband signal and common-mode voltage suppress circuit 24 and relay network 25, all connect by circuit between each circuit.Wherein:
Described overvoltage crowbar 20,36 audions that encapsulated by TO-92A form;
Described instrument amplifier circuit 21, the INA114 chip being encapsulated by straight cutting forms;
Three grades of filtering and amplifying circuits 23 of described baseband signal secondary filtering and amplifying circuit 22 and described baseband signal, form by the LM358 of SOP encapsulation; Wherein: described baseband signal secondary filtering and amplifying circuit 22, the precision resistance that is 0.1% by LM358 and precision forms forward amplifying circuit, the passive filter circuit that high pass filter and low pass filter are all made up of 0.1% precision resistance and electric capacity; Three grades of filtering and amplifying circuits 23 of described baseband signal, form KRC wave filter by precision resistance and the electric capacity of LM358 and 0.1%;
Described common-mode voltage suppresses circuit 24, and the LM358 being encapsulated by SOP forms, and utilizes negative feedback, reaches 50dB restraint;
Described relay network 25, realizes electrocardiosignal I connection, II the lead electrocardiosignal connected mode of connection and chest electrode connection of connection, III of leading of leading by the folding of relay.
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, lcd screen 2, keyboard 3, communication interface 4, on and off switch 5, calibration output interface 6 and signal input interface 7 are installed on the panel of described cabinet 1, 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 connecting interface, and LL is left lower limb electrode connecting interface, and RA is right arm electrode connecting interface, and LA is left arm electrode connecting interface.
Described calibration output interface 6 comprises constant temperature high stability crystal oscillator output port and the reference voltage output port of tracing to the source of tracing to the source, and all adopts BNC connector (female form).Constant temperature high stability crystal oscillator is traced to the source output port for constant temperature high stability crystal oscillator signal is led to cymometer, and then the time reference that is calibrated simulator is traced to the source.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 is traced to the source output port for the inner 2.5V AD of mainboard reference voltage signal is led to digital multimeter, and then the voltage reference that is calibrated simulator is traced to the source.Wherein the VR+ output lead of the reference voltage module 9 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 condition module 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, connect by circuit between each module.Wherein:
Described signal condition module 8 comprises that overvoltage crowbar 20, instrument amplifier circuit 21, baseband signal secondary filtering and amplifying circuit 22, three grades of filtering and amplifying circuits 23 of baseband signal, common-mode voltage suppress circuit 24 and relay network 25, all connect by circuit between each circuit.This signal condition module 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 conversion to 1kHz place noise voltage (RTI) of input is only
36 audions that described overvoltage crowbar 20 is encapsulated by TO-92A form;
The INA114 chip that described instrument amplifier circuit 21 is encapsulated by straight cutting forms;
The LM358 that described baseband signal secondary filtering and amplifying circuit 22 is encapsulated by SOP forms, precision resistance that wherein LM358 and precision are 0.1% composition forward amplifying circuit, the passive filter circuit that high pass filter and low pass filter are all made up of 0.1% precision resistance and electric capacity;
The LM358 that three grades of filtering and amplifying circuits 23 of described baseband signal are encapsulated by SOP forms, and wherein LM358 and 0.1% precision resistance and electric capacity composition KRC wave filter have had filtering characteristic concurrently in possessing enlarging function;
The LM358 that described common-mode voltage inhibition circuit 24 is encapsulated by SOP forms, and utilizes negative-feedback principle, and the common-mode voltage that reaches 50dB suppresses ability;
Described relay network 25 possesses the networking of input signal path and controls function, realize electrocardiosignal I lead connection, II lead connection, III lead connection, the multiple electrocardiosignal connected mode of chest electrode connection by the folding of relay, formed by the silver contact of Omron, low thermoelectrical potential solid-state relay G6AK-274P;
Described reference voltage module 9 has the function that 2.5V reference voltage is provided for analog-digital converter, and the TL341 chip being encapsulated by TO-92A forms, and the auxiliary circuit consisting of the precision resistance by 0.1%, electric capacity is led to voltage calibration port;
Described constant temperature high stability crystal oscillator module 10 has 10MHz frequency output function, and surely can reach 1 × 10 second
-12, ageing rate is better than 5 × 10
-10/ day, make interval measuring accuracy be better than 20ns, mainly formed by the constant temperature crystal oscillator with high stability OCXO8789 of Oscilloquartz company;
Complete control and the coordination function to other modules by described MCU module 11, this module is made up of the ARM chip STM32F103R of 64 pin LQFP encapsulation, and DMA function that this chip internal is integrated, for high speed acquisition provides safeguard;
Described communication module 15 has USB communication function, the CH373 chip being encapsulated by SOP forms, meet USB2.0 protocol requirement, be connected with computer by USB connecting line, make it possess main usb function, data are preserved with CSV form by USB flash disk by communication interface 4, the electric current that is 1000mA to the maximum can also be externally provided;
Described have+5V of power module 14, the output function of 3.3V and 12V, the LM2937 chip that 7805 chips, 7905 chips, the SOT that it is mainly encapsulated by TO220 encapsulates and the on and off switch 5 that possesses 12V, 3A output form;
Described RAM module 12 has sampled data memory function, and the IS61LV25616 being encapsulated by TSOP forms, and has the capacity of 512k × 16bit, can store the signal of 16s;
Described liquid crystal driver module 13 has the effect that improves MCU module I O interface fan-out capability and protection MCU module I O interface, and the 75LS245 being encapsulated by SOP forms;
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 the anti-shake and interrupt output function of hardware, and the 74LS164 chip of the BC7281 being encapsulated by DIP, SOP encapsulation forms;
Analog-digital conversion circuit as described 19 possesses the precision of 16, signal after signal condition module is carried out under the control of MCU module to analog digital conversion, 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 forms.
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 carry 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, the data after conversion are read out, and then by dma mode, usage data bus DB and control bus CB2 are directly stored to RAM module by the data that read out and keep in.This RAM module has the memory space of 512kB, and the picking rate of analog-to-digital conversion module is 4000Hz, and hence one can see that, and this device is the longest can record the electrocardiosignal that duration is about 136s simultaneously.For the data that are 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, directly deposits calibration result in USB flash disk; If this device is connected to computer by USB, MCU module is uploaded to computer by control bus CB3 by calibration result, and generates the calibration record of word form by the relative program in computer.MCU module is controlled and is read Keyboard drive module by control bus CB3, 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 demonstration of display module.MCU module is controlled the relay network in signal condition module by control bus CB4, makes relay network switch to leading of appointment.
Referring to Fig. 3, the operation principle of signal condition module: this module mainly completes amplification, the filter function to electrocardiosignal simulator or multi-parameter physiology signal simulator output signal.Due to the output signal of electrocardiosignal simulator or multi-parameter physiology signal simulator and the structural similarity of human ecg signal network, for accurate-metering, this module also adopts the structure of similar electrocardiograph.The signal of electrocardiosignal simulator or the output of multi-parameter physiology signal simulator; after the control of relay network circuit and networking, form standard lead connected mode, then enter respectively overvoltage crowbar; to remove too high voltage, prevent from amplifier to cause damage.The structure of overvoltage crowbar as shown in Figure 4, is mainly made up of triode array, in the time that the reasons such as static cause input signal excessive, can, by signal limitations between+2V, instrument amplifier module be protected.At present, conventional overvoltage crowbar is mainly made up of general-purpose diode, but the leakage current of general-purpose diode is larger, can introduce more noise jamming for detection system; The audion array structure adopting in this device also reduces leakage current in reaching overvoltage protection object, thereby improves the signal processing and amplifying ability of device.Signal through overvoltage crowbar will enter instrument amplifier circuit, and this circuit amplifies the difference mode signal of input, have up to the common mode disturbances of 110dB and suppress ability.The amplification of this circuit is fixed as 6 times, removes flip-flop again, to prevent follow-up amplifier saturation through the signal of instrument amplifier circuit through simple high pass filter.The signal of 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 is controlled, the amplification of this module is variable, to be 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 three grades of filtering and amplifying circuits of baseband signal again, and the structure of this circuit and baseband signal secondary filtering and amplifying 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 has adopted common-mode voltage inhibition circuit to improve the common mode inhibition capacity of electrocardiosignal conditioning module.Common-mode voltage suppresses circuit and adopts degenerative principle to design, and can realize the common mode inhibition capacity of nearly 300 times (being 50dB), has improved the performance of electrocardiosignal conditioning module.Through the processing of above circuit, more than the small-signal of electrocardiosignal simulator or the output of multi-parameter physiology signal simulator is amplified to 0.2V by electrocardiosignal modulate circuit, for the digitized of analog-to-digital conversion module provides guarantee.R in Fig. 3
1a, R
2a, R
3a, R
t, R
1b, R
2b, R
3b, R
0, R
1and C
1bbe respectively resistance, electric capacity label in signal condition module, for the principle signal of instrument amplifier circuit.
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 analog-to-digital conversion module data conversion storage in RAM module, after data acquisition completes, MCU module will be processed the digital signal in RAM module.For electrocardiosignal simulator or multi-parameter physiology signal simulator, the analog electrocardiogram signal of exporting mainly contains amplitude and two indexs of heart rate.For the calibration of heart rate, the mode of T crest value is searched in employing, 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, by multiplying each other with sampling interval 0.25ms, obtain the cycle T of electrocardiosignal again
1, T
2... T
x, the then cycle T s using their averages as analog electrocardiogram signal, then calculate the heart rate of analog electrocardiogram signal by 60/Ts.Calibration (referring to Fig. 5) for amplitude: utilize the T crest value point finding above, between adjacent two T crest value points, search baseline, and record corresponding analog electrocardiogram signal base line value, using this baseline value with the difference of the T crest value being closely connected with it as electrocardio amplitude, obtain A
1, A
2... A
x, the amplitude As using their average as analog electrocardiogram signal, then calculate the amplitude (G be demarcate amplification) of this analog electrocardiogram signal by As/G.
To trace to the source (referring to Fig. 2) of voltage, frequency.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 carries out taking reference voltage module as voltage reference, and the output voltage of reference voltage module is traced to the source, and just can realize analog digital conversion performance is traced to the source.The time reference of whole device all, taking constant temperature high stability crystal oscillator module as basis, by high stability crystal oscillator module is traced to the source, just can be traced to the source time reference.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, on the panel of described cabinet (1), be 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 mainboard on each corresponding module control connection; 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+, tetra-interfaces of CR-, wherein VR+, VR-are for the reference voltage output of D/A converter module, and CR+, CR-are 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 condition module (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), between each module, all connects by circuit.
5. multi-parameter physiology signal simulator self-checking device according to claim 4; it is characterized in that: described signal condition module (8) comprises that overvoltage crowbar (20), instrument amplifier circuit (21), baseband signal secondary filtering and amplifying circuit (22), three grades of filtering and amplifying circuits of baseband signal (23) and common-mode voltage suppress circuit (24) and relay network (25), all connect by circuit between each circuit.
6. multi-parameter physiology signal simulator self-checking device according to claim 5, is characterized in that: described overvoltage crowbar (20), at least 4 audions that encapsulated by TO-92A form.
7. multi-parameter physiology signal simulator self-checking device according to claim 5, is characterized in that: described instrument amplifier circuit (21), the INA114 chip being encapsulated by straight cutting forms.
8. multi-parameter physiology signal simulator self-checking device according to claim 5, it is characterized in that: three grades of filtering and amplifying circuits of described baseband signal secondary filtering and amplifying circuit (22) and described baseband signal (23), form by the LM358 of SOP encapsulation; Wherein: described baseband signal secondary filtering and amplifying circuit (22), the precision resistance that is 0.1% by LM358 and precision forms forward amplifying circuit, the passive filter circuit that high pass filter and low pass filter are all made up of 0.1% precision resistance and electric capacity; Three grades of filtering and amplifying circuits of described baseband signal (23), form KRC wave filter by precision resistance and the electric capacity of LM358 and 0.1%.
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 being encapsulated by SOP forms, 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 connection, II the lead electrocardiosignal connected mode of connection and chest electrode connection of connection, III of leading of leading by the folding of relay.
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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 |
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| CN117008070A (en) * | 2023-10-07 | 2023-11-07 | 成都世源频控技术股份有限公司 | Radar simulator with electric leakage detection function |
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