Electric signal real-time recording and printing system

Abstract

The invention provides a real-time recording and printing system for electric signals. The real-time recording and printing system comprises a power conversion and management module, an interface and selection module, a button operation and rate selection module, a central module and a printer, the interface and selection module selects to carry out amplitude selection and conditioning on a plurality of received voltage U signals or a plurality of received current I signals and then sends the signals to the central module; the button operation and rate selection module is used for operating and selecting various buttons and rate gears; the central module carries out real-time isolation processing on signals sent by the interface and selection module according to operation and selection results of the buttons and the rate gears, and carries out acquisition, storage and printing according to different rate requirements; the central module reads and prints the last data recorded in the storage unit; and the printer is used for printing the data. According to the invention, recording of voltage signals and current signals is taken into consideration, the cost is low, multiple signal input channels are provided, the signal input range is selectable, and the channels are isolated.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of electric signal real-time recording printing system, belong to electrical signal recording technical field. BACKGROUND

[0002] In the field of voltage signal or current signal recording involving electronic and electrical products, general oscilloscope, general pen recorder, or current sensor plus general oscilloscope, current sensor plus general pen recorder are commonly used to achieve, but general oscilloscope, general pen recorder and current sensor not only have high price, but also have serious drawbacks such as few signal input channels, narrow signal input range, and no isolation between channels.

[0003] Therefore, it is particularly urgent to develop a system that records voltage signals and current signals, has low cost, multiple signal input channels, selectable signal input range, and isolation between channels. SUMMARY

[0004] The technical problem solved by the present application is to overcome the above-mentioned shortcomings of the prior art, and to provide an electric signal real-time recording printing system.

[0005] The technical solution adopted by the present application is: an electric signal real-time recording printing system, comprising a power conversion and management module, an interface and selection module, a button operation and speed selection module, a central module, and a printer.

[0006] The power conversion and management module provides isolated power supply for the interface and selection module, the central module and the printer.

[0007] The interface and selection module selects to receive a plurality of voltage U signals or a plurality of current I signals, selects and conditions the amplitude of the plurality of voltage U signals or converts the plurality of current I signals into voltage signals and then selects and conditions the amplitude, and sends the signals to the central module.

[0008] The button operation and speed selection module is used to realize the operation and selection of various buttons and speed gears, and sends the operation and selection results of the buttons and speed gears to the central module.

[0009] The central module performs real-time isolation processing on the signals sent by the interface and selection module according to the operation and selection results of the buttons and speed gears, and collects, stores and prints the signals according to different speed requirements.

[0010] The printer is used for printing data.

[0011] Further, the power conversion and management module comprises: a filter unit, a surge protection unit, an isolated AC / AC unit, an isolated AC / DC unit;

[0012] The filter unit and the surge protection unit respectively perform filtering processing and surge protection on the received 220VAC mains power;

[0013] The isolated AC / AC unit and the isolated AC / DC unit isolate the signals sent by the filter unit and the surge protection unit, provide the printer with an isolated 220VAC power supply, and respectively provide the interface and selection module and the central module with isolated 5VDC and 12VDC power supplies.

[0014] Further, the interface and selection module comprises: a multi-channel voltage U signal interface, a multi-channel current I signal interface, an I / U conversion unit, a U / I switching unit, and a signal amplitude selection and conditioning unit.

[0015] The multi-channel voltage U signal interface receives a plurality of voltage signals to be recorded.

[0016] The multi-channel current I signal interface receives a plurality of current signals to be recorded.

[0017] The I / U conversion unit converts the plurality of current signals to be recorded into voltage signals and sends them to the U / I switching unit.

[0018] The U / I switching unit selects to connect the multi-channel voltage U signal interface to the signal amplitude selection and conditioning unit, or selects to connect the multi-channel voltage signal output by the I / U conversion unit to the signal amplitude selection and conditioning unit.

[0019] The signal amplitude selection and conditioning unit performs amplitude selection and conditioning on the signal output by the U / I switching unit, supports the input of signals with different voltage amplitudes or current amplitudes, and conditions the signal to the input range allowed by the AD unit in the central module.

[0020] Further, the number of channels of the voltage U signal interface and the current I signal interface is 8 or 16 or 24; the voltage U signal interface and the current I signal interface are connectors, which are circular or rectangular connectors with conductive sealing gaskets, locking devices, and anti-misplug functions.

[0021] Further, the U / I switching unit is a multi-channel switch, and the number of channels of the switch is the same as the number of channels of the voltage U signal interface or the current I signal interface; the U / I switching unit is a mechanical waveband switch.

[0022] Further, the signal amplitude selection and conditioning unit comprises n groups of same amplitude selection and conditioning circuits, each group of amplitude selection and conditioning circuit comprises conditioning resistors Rn0-Rn4 and selection switch Kn, the value of n is same as the number of voltage U signal interface or current I signal interface;

[0023] One end of the nth input voltage signal Uin-n is connected to one end of the conditioning resistor Rn0, the other end of the conditioning resistor Rn0 is connected to point 1 of the selection switch Kn; points 2-5 of the selection switch Kn are respectively connected to one end of the conditioning resistors Rn1-Rn4, the other end of the conditioning resistors Rn1-Rn4 is connected to the other end of the nth input voltage signal Uin-n; the point 1 of the switch Kn and the other end of the conditioning resistors Rn1-Rn4 form the nth output voltage signal Uout-n;

[0024] When Uin-n≤100VDC, the conditioning resistor Rn0 adopts a single resistor; when Uin-n>100VDC, the conditioning resistor Rn0 adopts a plurality of same resistors in series; the selection switches K1-Kn adopt mechanical wave band switches with n paths and 4 gears.

[0025] Further, when the ratio of the conditioning signal amplitude of the input signal amplitude selection and conditioning unit to the input amplitude of the AD unit, i.e. Uin-n / Uout-n≤2 / 1, the point 1 of Kn is connected to the point 2 thereof, and Rn0 and Rn4 are combined into a conditioning circuit;

[0026] When the ratio of the conditioning signal amplitude of the input signal amplitude selection and conditioning unit to the input amplitude of the AD unit, i.e. 2 / 1

[0027] When the ratio of the conditioning signal amplitude of the input signal amplitude selection and conditioning unit to the input amplitude of the AD unit, i.e. 3 / 1

[0028] When the ratio of the conditioning signal amplitude of the input signal amplitude selection and conditioning unit to the input amplitude of the AD unit, i.e. 6 / 1

[0029] When the ratio of the conditioning signal amplitude of the input signal amplitude selection and conditioning unit to the input amplitude of the AD unit, i.e. Uin-n / Uout-n>11 / 1, then the resistance value of Rn0 is increased.

[0030] Further, the central module comprises a signal isolation unit, an AD and switch quantity management unit, a controller and a storage unit;

[0031] The signal isolation unit is used for isolation between input signals and output signals, adopts a three-terminal isolation circuit, and realizes mutual isolation of input signals, working power supply and output signals.

[0032] The AD and switch quantity management unit is used for collecting signals and identifying the states of the rate selection switch, the collection printing button and the disk printing button.

[0033] The controller is used for realizing the running of the operating system and the application program.

[0034] The storage unit is used for storing data, and when the disk printing instruction is identified, the central module reads and prints the last recorded data in the storage unit.

[0035] Further, the button operation and rate selection module comprises a power button, a reset button, a rate selection switch, a collection printing button and a disk printing button.

[0036] The power button is used for power-on and power-off.

[0037] The reset button is used for resetting and restarting the controller in the central module.

[0038] The rate selection switch triggers the controller to prepare for data storage, reading and printing of corresponding rates through the AD and switch quantity management module in the central module.

[0039] The collection printing button triggers the controller to perform signal collection, storage and printing of corresponding rates through the AD and switch quantity management module in the central module.

[0040] The disk printing button triggers the controller to perform disk data reading and printing of corresponding rates through the AD and switch quantity management module in the central module, and the disk data reading and printing is reading and printing of the last collected and printed data recorded in the storage unit.

[0041] The rate selection switch, the collection printing button and the disk printing button adopt high and low level signals, and the high and low level signals are given to the controller in the central module through the AD and switch quantity management module in the central module, so as to trigger the controller to perform corresponding responses.

[0042] Further, the rate selection switch comprises 0.1s, 1s and 10s gears, that is, corresponding data collected in 1 time unit is printed in 10 data grids, 1 data grid and 0.1 data grid; and the rate selection switch adopts a mechanical wave band switch.

[0043] Compared with the prior art, the present application has the following beneficial effects:

[0044] (1) The application adopts a compatible acquisition and recording scheme of voltage signals and current signals, realizes a system that can be used for acquisition and recording of voltage signals and can be used for acquisition and recording of current signals, and improves the adaptability of the system to various application scenarios and requirements;

[0045] (2) The application adopts a power supply filtering, anti-surge, and high power density, high efficiency, isolated AC / AC and AC / DC switching power supply scheme, reduces the volume and weight of the system, ensures the safety of the power conversion and management module itself, ensures the independent operation of the power supply of each part of the system, avoids the fault diffusion between each part of the system due to the abnormality of a certain component, improves the working reliability of the system, and facilitates the rapid positioning of the fault position after a fault occurs in a certain part of the system;

[0046] (3) The application adopts a mechanical wave band switch as a U / I switching, signal amplitude selection, and rate selection scheme, reduces the influence of the voltage drop on the switch on the acquisition and high-low level recognition of the electrical signal, and improves the working reliability of the system; the application adopts a signal amplitude selection and conditioning scheme, realizes the input, selection, acquisition and recording of different amplitude signals, and ensures the universality of the system;

[0047] (4) The application adopts a three-terminal isolation circuit scheme of input signals, working power supply, and output signals, ensures that the collected signals and the system work do not affect each other; the application adopts a connector with conductive sealing gasket, with locking, with anti-misplug as a multi-channel signal interface, ensures the reliable access of the signal and the electromagnetic compatibility of the system. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is the system block diagram of the application;

[0049] Figure 2 is the signal amplitude selection and conditioning unit principle diagram of the application. DETAILED DESCRIPTION

[0050] The application will be further described below in combination with examples.

[0051] As shown in Figure 1 , a real-time recording and printing system of electrical signals of the application includes a power conversion and management module, an interface and selection module, a button operation and rate selection module, a central module, and a printer.

[0052] The power conversion and management module provides isolated power supply for each part of the system, which ensures isolation of the fault when a power failure occurs in a part of the system, avoids the spread of the fault to protect other parts; after the 220VAC mains is introduced into the system and is filtered and protected from surge, the isolated 220VAC power supply is provided for the printer, and the isolated 5VDC and 12VDC power supplies are provided for the interface and selection module and the central module;

[0053] The interface and selection module is used to select the multi-channel voltage U signal directly connected to the system to access the signal amplitude selection and conditioning unit, or select the multi-channel current I signal connected to the system to access the multi-channel voltage signal after I / U conversion, and then access the signal amplitude selection and conditioning unit, and then send to the next central module after amplitude selection and conditioning;

[0054] The button operation and speed selection module is used to realize the operation and selection of various buttons and speed gears by the user;

[0055] The central module performs real-time isolation processing on the received signal according to the user's operation on the button and the selection of the speed, and collects, stores and prints according to different speed requirements, or reads and prints the last recorded data in the storage unit;

[0056] The printer is used for printing data.

[0057] The power conversion and management module includes a filtering unit, a surge protection unit, an isolated AC / AC unit and an isolated AC / DC unit; the isolated AC / AC unit and the isolated AC / DC unit are preferably a switch power supply with small volume and weight, large power density and high efficiency;

[0058] The power supply is inside the system, preferably close to the system shell and away from the central module and the I / U conversion unit, and a shielding metal partition is designed between the power supply and other modules, so that the grounding and shielding of the power supply are good, which ensures that the switch power supply works without electromagnetic interference to other parts of the system, and ensures good heat dissipation.

[0059] The interface and selection module includes: a multi-channel voltage U signal interface, a multi-channel current I signal interface, an I / U conversion unit, a U / I switching unit, and a signal amplitude selection and conditioning unit; the multi-channel voltage U signal interface is used to connect the voltage signal to be recorded to the system; the multi-channel current I signal interface is used to connect the current signal to be recorded to the system; the I / U conversion unit is used to convert the current signal into a voltage signal; the U / I switching unit is used to select the multi-channel voltage U signal directly connected to the system to be connected to the signal amplitude selection and conditioning unit, or to select the multi-channel voltage signal after the multi-channel current I signal connected to the system is I / U converted to be connected to the signal amplitude selection and conditioning unit; the signal amplitude selection and conditioning unit is used to ensure that the system supports signal inputs of different voltage amplitudes or current amplitudes, and condition the signal to the input range allowed by the AD part;

[0060] The number of the voltage U signal interface and the current I signal interface is preferably 8, 16 or 24; the interface is a connector, preferably a circular or rectangular connector with a conductive sealing pad, a locking device, and an anti-misinsertion function to ensure the reliability of the signal access system and the electromagnetic compatibility of the system.

[0061] The U / I switching unit is a multi-way switch, and the number of switches is the same as the number of voltage U signal interfaces or current I signal interfaces; the switch is preferably a mechanical band switch, which can reduce the impact of the voltage drop on the switch on the accuracy of system signal acquisition.

[0062] like Figure 2 As shown, the signal amplitude selection and conditioning unit includes n groups of completely identical amplitude selection and conditioning circuits, each group of amplitude selection and conditioning circuits consisting of conditioning resistors Rn0 to Rn4 and a selection switch Kn, where the value of n is the same as the number of channels of the voltage U signal interface or the current I signal interface; one end of the n-th input voltage signal Uin-n is connected to one end of the conditioning resistor Rn0, and the other end of the conditioning resistor Rn0 is connected to point 1 of the selection switch Kn; points 2 to 5 of the selection switch Kn are respectively connected to one end of the conditioning resistors Rn1 to Rn4, and the other ends of the conditioning resistors Rn1 to Rn4 are all connected to the other end of the n-th input voltage signal Uin-n; and the n-th output voltage signal Uout-n is between point 1 of the switch Kn and the other ends of the conditioning resistors Rn1 to Rn4.

[0063] The conditioning resistors Rn0-Rn4 are preferably precision plug-in resistors with little temperature influence; when Uin-n≤100VDC, Rn0 is preferably a single resistor, and when Uin-n>100VDC, Rn0 is preferably a plurality of resistors of the same type connected in series to ensure that the voltage drop across each resistor does not exceed the rated value; the resistance of Rn0 is preferably selected to be 10MΩ or more to reduce the influence of the system input impedance on the signal to be recorded; the conditioning ratio, i.e. Uin-n / Uout-n, is preferably 2 / 1 or 3 / 1 or 6 / 1 or 11 / 1; the switches K1-Kn are preferably selected to be mechanical waveband switches with n paths and 4 ranges to reduce the influence of the voltage drop across the switches on the accuracy of signal acquisition by the system;

[0064] Preferably, one end of the resistor Rn0 in each circuit is connected to one end of the conditioning signal input, and the other end is connected to one end of the conditioning signal output and to one end of the selection switch Kn;

[0065] Preferably, the other ends of the resistors Rn1-Rn4 in each circuit are connected together, and the other end of the conditioning signal input and the other end of the conditioning signal output are connected together;

[0066] Preferably, the one ends of the resistors Rn1-Rn4 in each circuit are connected to the 5th end, the 4th end, the 3rd end and the 2nd end of the selection switch Kn, respectively;

[0067] When the ratio of the amplitude of the input conditioning signal to the input amplitude of the AD unit, i.e. Uin-n / Uout-n≤2 / 1, the 1st end of Kn is connected to the 2nd end, and Rn0 and Rn4 are combined into a conditioning circuit;

[0068] When the ratio of the amplitude of the input conditioning signal to the input amplitude of the AD unit, i.e. 2 / 1

[0069] When the ratio of the amplitude of the input conditioning signal to the input amplitude of the AD unit, i.e. 3 / 1

[0070] When the ratio of the amplitude of the input conditioning signal to the input amplitude of the AD unit, i.e. 6 / 1

[0071] When the ratio of the amplitude of the input conditioning signal to the input amplitude of the AD unit, i.e. Uin-n / Uout-n>11 / 1, the resistance of Rn0 is designed to be larger.

[0072] The button operation and rate selection module comprises: a power button, a reset button, a rate selection switch, a collection print button, a disk print button;

[0073] The power button is used for power-on and power-off of the system;

[0074] The reset button is used for resetting and restarting the controller in the central module;

[0075] The rate selection switch triggers the controller to prepare for data storage, reading and printing at a corresponding rate through the switch quantity management part in the central module;

[0076] The collection print button triggers the controller to perform signal collection, storage and printing at a corresponding rate through the switch quantity management part in the central module;

[0077] The disk print button triggers the controller to perform disk data reading and printing at a corresponding rate through the switch quantity management part in the central module; the disk data reading and printing is reading and printing of the last collection and printing data recorded in the storage unit;

[0078] The rate selection switch, the collection print button and the disk print button all have high and low levels, and the high and low level signals are sent to the controller in the central module through the switch quantity management part in the central module, so as to trigger the controller to perform corresponding responses.

[0079] The rate selection is preferably 0.1s, 1s and 10s gears, i.e. corresponding to printing the data collected in 1 time unit in 10 data grids, 1 data grid and 0.1 data grid, which facilitates the amplification or reduction of the signal for viewing; the gear number of the rate selection switch is the same as the number of the rate gears, and the rate selection switch is preferably a mechanical waveband switch, which can reduce the influence of voltage drop on the high and low level signals of the switch, thereby avoiding that the switch quantity management part cannot identify the high and low level state of the rate selection switch;

[0080] When the to-be-recorded signal changes at a relatively fast speed, the rate selection switch selects 1s or 0.1s gear, which facilitates the viewing or recording of the details of the signal;

[0081] When the to-be-recorded signal changes at a relatively slow speed, the rate selection switch selects 1s or 10s gear, which facilitates the viewing or recording of the trend of the signal.

[0082] The central module comprises: a signal isolation unit, an AD and switch quantity management unit, a controller and a storage unit;

[0083] The signal isolation unit is used for isolation between input signals and output signals, and is preferably a three-terminal isolation circuit, i.e. input signals, working power supply and output signals are mutually isolated, so as to avoid mutual influence between the collected signals and the system;

[0084] The AD and switch quantity management unit is used for acquisition and rate selection switch of signals, acquisition print button, state recognition of disk print button, preferably simultaneously having AD acquisition and switch quantity acquisition module to reduce system composition, control system volume and cost;

[0085] The controller is used for realizing operation of operating system and application program, preferably embedded module realized by single-chip microcomputer or ARM to reduce system volume and cost;

[0086] Data storage, preferably text format, can reduce file requirement for system storage space, thereby reducing system cost.

[0087] The system shell is made of aluminum alloy material; conductive sealing rubber strip mounting grooves are designed at assembly contact positions of each part of the system shell, weight-reducing and heat-dissipating grooves are designed at non-bearing positions of the system shell, and weight-reducing holes are designed on internal mounting plates or partitions of the system; each part is formed through CNC precision machining, and conductive treatment process is used for assembly contact positions of each part; in the assembly process, the contact positions of each part of the shell are sealed through conductive rubber strips; the electromagnetic compatibility, strength reliability, heat-dissipating property and lightness of the system are ensured from aspects of material selection, design and machining, assembly scheme and process and the like. The shell made of aluminum alloy material and the conductive sealing design scheme between assembly contact surfaces of each shell part are adopted, mutual interference between the system and other electronic devices is avoided, and the stable reliability, electrical continuity and electromagnetic compatibility of the system are ensured.

[0088] The contents not described in detail in the specification of the present application are known technology to those skilled in the art.

Claims

1. A real-time recording and printing system for electrical signals, characterized by: Including power conversion and management module, interface and selection module, button operation and rate selection module, central module, printer; The power conversion and management module provides isolated power to the interface and selection modules, central module, and printer; The interface and selection module selects to receive a number of voltage U signals or a number of current I signals, performs amplitude selection and conditioning on the voltage U signals or converts the current I signals into voltage signals, performs amplitude selection and conditioning on the signals, and sends the signals to the central module; The button operation and rate selection module is used to realize the operation and selection of various buttons and rate gears, and send the operation and selection results of buttons and rate gears to the central module; The central module isolates and processes the signals sent by the interface and selection module in real time according to the operation and selection results of buttons and speed gears, and collects, stores and prints them according to different speed requirements; The printer is used to print data.

2. The electrical signal real-time recording and printing system according to claim 1, characterized in that: The power conversion and management module includes: a filtering unit, a surge protection unit, an isolated AC / AC unit, and an isolated AC / DC unit; The filter unit and surge protection unit respectively filter and protect the received 220VAC mains power; The isolated AC / AC unit and isolated AC / DC unit isolate the signals sent by the filter unit and surge protection unit, provide isolated 220VAC power to the printer, and provide isolated 5VDC and 12VDC power to the interface and selection module and the central module respectively.

3. The electrical signal real-time recording and printing system according to claim 1, characterized in that: The interface and selection module includes: a multi-channel voltage U signal interface, a multi-channel current I signal interface, an I / U conversion unit, a U / I switching unit, and a signal amplitude selection and conditioning unit; The multi-channel voltage U signal interface receives the multi-channel voltage signals to be recorded; The multi-channel current I signal interface receives the multi-channel current signals to be recorded; The I / U conversion unit converts the multi-channel current signals to be recorded into voltage signals and sends them to the U / I switching unit; The U / I switching unit selects to connect the multi-channel voltage U signal to the signal amplitude selection and conditioning unit, or selects to connect the multi-channel voltage signal output by the I / U conversion unit to the signal amplitude selection and conditioning unit; The signal amplitude selection and conditioning unit performs amplitude selection and conditioning on the signal output by the U / I switching unit to support signal inputs of different voltage amplitudes or current amplitudes, and conditions the signal to the input range allowed by the AD unit in the central module.

4. The real-time recording and printing system for electrical signals according to claim 3, characterized in that: The number of channels of the voltage U signal interface and the current I signal interface is 8, 16 or 24; the voltage U signal interface and the current I signal interface are both connectors, which are circular or rectangular connectors with conductive sealing pads, locking devices and anti-misinsertion functions.

5. The electrical signal real-time recording and printing system according to claim 3, characterized in that: The U / I switching unit is a multi-way switch, and the number of switches is the same as the number of voltage U signal interface or current I signal interface; the U / I switching unit is a mechanical band switch.

6. The electrical signal real-time recording and printing system according to claim 3, characterized in that: The signal amplitude selection and conditioning unit includes n groups of identical amplitude selection and conditioning circuits, each group of amplitude selection and conditioning circuits includes conditioning resistors Rn0 to Rn4 and a selection switch Kn, where the value of n is the same as the number of the voltage U signal interface or the current I signal interface; One end of the nth input voltage signal Uin-n is connected to one end of the conditioning resistor Rn0, and the other end of the conditioning resistor Rn0 is connected to point 1 of the selection switch Kn; points 2 to 5 of the selection switch Kn are respectively connected to one end of the conditioning resistors Rn1 to Rn4, and the other ends of the conditioning resistors Rn1 to Rn4 are all connected to the other end of the nth input voltage signal Uin-n; the nth output voltage signal Uout-n is between point 1 of the switch Kn and the other ends of the conditioning resistors Rn1 to Rn4; When Uin-n≤100VDC, the conditioning resistor Rn0 adopts a single resistor; when Uin-n>100VDC, the conditioning resistor Rn0 adopts several identical resistors connected in series; the selection switches K1~Kn adopt mechanical band switches with n channels and 4 gears.

7. The electrical signal real-time recording and printing system according to claim 6, characterized in that: When the input signal amplitude selection and the ratio of the conditioned signal amplitude of the conditioning unit to the input amplitude of the AD unit, that is, Uin-n / Uout-n ≤ 2 / 1, point 1 of Kn is connected to point 2, and Rn0 and Rn4 are combined to form a conditioning circuit; When the ratio of the input signal amplitude selection and conditioning unit's conditioning signal amplitude to the AD unit's input amplitude is 2 / 1<Uin-n / Uout-n≤3 / 1, point 1 of Kn is connected to point 3 of Kn, and Rn0 and Rn3 are combined to form a conditioning circuit; When the ratio of the input signal amplitude selection and conditioning unit's conditioning signal amplitude to the AD unit's input amplitude is 3 / 1<Uin-n / Uout-n≤6 / 1, point 1 of Kn is connected to its point 4, and Rn0 and Rn2 are combined to form a conditioning circuit; When the ratio of the input signal amplitude selection and conditioning signal amplitude of the conditioning unit to the input amplitude of the AD unit is 6 / 1<Uin-n / Uout-n≤11 / 1, point 1 of Kn is connected to point 5 of Kn, and Rn0 and Rn1 are combined to form a conditioning circuit; When the ratio of the input signal amplitude selection and conditioning unit's conditioned signal amplitude to the AD unit's input amplitude, ie, Uin-n / Uout-n>11 / 1, the resistance of Rn0 is increased.

8. The electrical signal real-time recording and printing system according to claim 1, characterized in that: The central module includes: a signal isolation unit, an AD and switch quantity management unit, a controller and a storage unit; The signal isolation unit is used to isolate the input signal and the output signal. It adopts a three-terminal isolation circuit to achieve mutual isolation between the input signal, working power supply and output signal. The AD and switch management unit are used to collect signals and identify the status of the rate selection switch, acquisition print button, and disk print button; The controller is used to implement the operation of the operating system and application programs; The storage unit is used for storing data. When a disk print instruction is recognized, the central module reads and prints the last data recorded in the storage unit.

9. The electrical signal real-time recording and printing system according to claim 8, characterized in that: The button operation and rate selection module includes: a power button, a reset button, a rate selection switch, a collection and print button, and a disk print button; The power button is used to power on and off the device; The reset button is used to reset and restart the controller in the central module; The rate selection switch triggers the controller through the AD and switch management module in the central module to prepare for executing data storage, reading, and printing at the corresponding rate; The acquisition and printing button triggers the controller to execute signal acquisition, storage and printing at the corresponding rate through the AD and switch management module in the central module; The disk print button triggers the controller to execute disk data reading and printing at a corresponding rate through the AD and switch management module in the central module; the disk data reading and printing is to read and print the last collected and printed data recorded in the storage unit; The rate selection switch, acquisition print button, and disk print button use high and low level signals, which are sent to the controller in the central module through the AD and switch quantity management module in the central module, thereby triggering the controller to execute the corresponding response.

10. The electric signal real-time recording and printing system according to claim 9, characterized in that: The rate selection switch includes 0.1s, 1s, and 10s gears, which corresponds to printing the data collected within 1 time unit in 10 data grids, 1 data grid, and 0.1 data grid; the rate selection switch adopts a mechanical band switch.

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