CN106153083A - The method and device of Portable precise test instrunment is made based on electronic equipment - Google Patents

Abstract

The invention discloses a method for making a portable precision testing instrument based on electronic equipment, comprising: connecting a detected signal to a sensor; the sensor transmits the detected signal to an intensity/voltage conversion module, and the intensity/voltage conversion module will be detected The signal is converted into a voltage signal; the voltage signal is operationally amplified by the operational amplifier; the level output module is connected to the voltage/frequency conversion module to indicate the number of stages of the operational amplifier; the voltage/frequency conversion module receives the voltage after the operational amplifier is operationally amplified Value, and convert the voltage value into a frequency value, the output amplitude of the voltage/frequency conversion module is determined by the level output module; the frequency value and amplitude are transmitted to the electronic device through the electronic device interface; the power supply supplies power to the entire test circuit. The invention also discloses a device corresponding to the method. The invention has the beneficial effects of portability, easy operation, low cost and wide application.

Description

Method and device for making portable precision testing instrument based on electronic equipment

technical field

The invention relates to the field of portable precision testing instruments, in particular to a method and device for making portable precision testing instruments based on electronic equipment.

Background technique

Portable test instruments and meters are the most common digital test tools in daily life and industrial applications. They have super computing power and powerful storage capacity of high-performance processing chips. More and more technicians carry hand-held high-precision measuring equipment when performing on-site operations, which can overcome factors such as the large size and difficulty in moving traditional measuring instruments. The installation, operation and maintenance of measuring equipment in many electronic equipment industries such as consumer electronics, national defense, heavy industry, education, semiconductor manufacturing, and communications all require portable measuring instruments to extract and analyze product quality through parameters such as pressure, flow, and voltage amplitude. More accurate and convenient access to such parameter data is the core of the development of smart meters.

Common portable test instruments and meters include sensors, drive circuits, analog-to-digital converters, data processing modules, and displays, etc., which are restricted by the scale of production and the number of users. Disadvantages such as upgradeability and weak communication functions. With the rapid development of smart phones and their related APP applications, combining the functions of mobile phones and APP software can provide a platform for processing, converting and displaying basic information. In other words, functions such as data processing modules and displays contained in common portable test instruments can be completely performed by mobile phones.

Based on the universality, extensiveness and portability of smart phones, and the mobile phone system used by most mobile phones is the Android system (free and open operating system based on Linux, easy to program and develop), this provides a platform for receiving information. A general-purpose, easy-to-handle, handheld-portable hardware and software processing environment. Combined with the high-precision and high-integration peripheral hardware of the existing instruments and meters, it is possible to design a precision instrument that is small, easy to carry, and easy to use. However, there are not many external interfaces of ordinary mobile phones, and it is difficult to collect data from the outside world. Therefore, the application in this field is limited.

Therefore, based on the above problems, there is an urgent need in this field to design a targeted solution to assist in improving the accuracy, portability, high efficiency and practical performance of portable test instruments.

Contents of the invention

The present invention aims to overcome the above technical problems, and proposes a method and device for making a portable precision testing instrument based on electronic equipment, which is convenient to carry, easy to operate, easy to upgrade, small in size, low in cost, rich in collected information and powerful in function.

In order to solve the above technical problems, according to the first aspect of the present invention, a method for making a portable precision testing instrument based on electronic equipment is provided, including:

The detected signal is connected to the sensor; the sensor transmits the detected signal to the intensity/voltage conversion module, and the intensity/voltage conversion module converts the detected signal into a voltage signal; the voltage signal is operationally amplified by an operational amplifier The level output module is connected with the voltage/frequency conversion module, which is used to represent the number of stages of the operational amplifier; the voltage/frequency conversion module receives the voltage value after the operational amplification of the operational amplifier, and converts the voltage value into a frequency value, The output amplitude of the voltage/frequency conversion module is determined by the level output module; the frequency value and amplitude are transmitted to the electronic equipment through the interface of the electronic equipment; wherein, the power supply supplies power for the entire test circuit.

According to the second aspect of the present invention, there is provided a method for making a portable precision test instrument based on electronic equipment, wherein the signal transmitted by the sensor is amplified by two stages of operations, and when the signal received by the sensor is the first signal, the second A signal is directly output to the voltage/frequency conversion module after being amplified by a first-stage operational amplifier; when the signal received by the sensor is a second signal, the second signal will first pass through the operational amplification of the first-stage operational amplifier, and then pass through The voltage signal after the first-stage operational amplification is transmitted to the comparator and compared with the reference potential set by the comparator itself, and the output voltage signal after comparison is transmitted to the second-stage operational amplifier, and the voltage signal after the second-stage operational amplification is then Output to the voltage/frequency conversion module; wherein, the first signal strength is greater than the second signal strength; the comparator is connected to the input terminal of the voltage/frequency conversion module.

According to the third aspect of the present invention, there is provided a method for making a portable precision test instrument based on electronic equipment, wherein the operational amplifier is a multi-stage operational amplifier, and the strength of the voltage signal converted by the intensity/voltage conversion module is The number of stages of the operational amplifier is selected; the number of the level output modules in the multi-stage operational amplifier circuit is the same as the number of stages of the operational amplifier.

According to a fourth aspect of the present invention, there is provided a method for making a portable precision testing instrument based on electronic equipment, wherein the sensor is an electric sensor, a thermal sensor, a light sensor, a gas sensor, a force sensor or an acoustic sensor .

According to a fifth aspect of the present invention, there is provided a method for making a portable precision test instrument based on electronic equipment, wherein the intensity/voltage conversion module is a resistance/voltage conversion module, a current/voltage conversion module, a power/voltage conversion module, Capacitance/voltage conversion module or inductance/voltage conversion module.

According to the sixth aspect of the present invention, there is provided a device for making portable precision testing instruments based on electronic equipment, including: power supply, sensor, intensity/voltage conversion module, operational amplifier, level output module, voltage/frequency conversion module and electronic equipment Interface; wherein, the power supply is used to supply power to the entire test circuit; the sensor is used to receive the detected signal; the intensity/voltage conversion module is connected between the sensor and the operational amplifier for the detected The signal is converted into a voltage signal; the operational amplifier is connected with the intensity/voltage conversion module for performing operational amplification on the signal; the level output module is connected with the voltage/frequency conversion module for indicating the number of stages of the operational amplifier ; The voltage/frequency conversion module is used to receive the voltage value amplified by the operational amplifier, and convert the voltage value into a frequency value, and the output amplitude of the voltage/frequency conversion module is determined by the level output module; The electronic equipment interface is used to receive the frequency signal and the amplitude outputted by the voltage/frequency conversion module, and transmit them to the electronic equipment.

According to the seventh aspect of the present invention, there is provided a device for making a portable precision test instrument based on electronic equipment, which also includes a comparator, which is provided with a reference potential; the operational amplifier includes a first-stage operational amplifier and a second-stage operational amplifier, Wherein, when the signal received by the sensor is the first signal, the first signal is directly output to the voltage/frequency conversion module after being operationally amplified by the first-stage operational amplifier; when the signal received by the sensor is the second signal , the second signal will first pass through the operational amplification of the first-stage operational amplifier, and the voltage signal after the first-stage operational amplification will be transmitted to the comparator and compared with the reference potential set by the comparator itself. After comparison, the output The voltage signal is transmitted to the two-stage operational amplifier, and the voltage signal after the two-stage operational amplification is output to the voltage/frequency conversion module; wherein, the first signal strength is greater than the second signal strength, and the comparison The device is connected to the input terminal of the voltage/frequency conversion module.

According to the eighth aspect of the present invention, there is provided a device for making a portable precision test instrument based on electronic equipment, wherein the operational amplifier is a multi-stage operational amplifier, and according to the intensity of the voltage signal converted by the intensity/voltage conversion module The number of stages of the operational amplifier is selected, and the number of the level output modules in the multi-stage operational amplifier circuit is the same as the number of stages of the operational amplifier, and each of the level output modules corresponds to different gears respectively. Voltage value.

According to the ninth aspect of the present invention, there is provided a device for making portable precision testing instruments based on electronic equipment, wherein the sensor is an electric sensor, a thermal sensor, a light sensor, a gas sensor, a force sensor or an acoustic sensor .

According to the tenth aspect of the present invention, there is provided a device for making portable precision testing instruments based on electronic equipment, wherein the intensity/voltage conversion module is a resistance/voltage conversion module, a current/voltage conversion module, a power/voltage conversion module, Capacitance/voltage conversion module or inductance/voltage conversion module.

Compared with the prior art, the method and device for making portable precision testing instruments based on electronic equipment of the present invention have the following advantages:

1. Small size, easy to carry and easy to operate;

2. Able to obtain more accurate, precise and abundant parameters;

3. Not restricted by the scale of production and the number of users, the cost is small and the price is low;

4. Connected to electronic equipment, with friendly display interface, multiple functions, upgradeability and good communication functions;

5. It can be connected to electronic devices with few external interfaces such as mobile phones, and can collect data from the outside world, which is widely used.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic flow sheet of the method for making portable precision testing instrument based on electronic equipment of the present invention;

Fig. 2 is a kind of frame structure schematic diagram of the device of making portable precision testing instrument based on electronic equipment of the present invention;

FIG. 3 is a schematic diagram of another frame structure of the device for manufacturing portable precision testing instruments based on electronic equipment according to the present invention.

Explanation of reference signs:

1. Power supply 2. Sensor

3. Intensity/voltage conversion module 4. Operational amplifier

41. One-stage operational amplifier 42. Two-stage operational amplifier

5. Level output module 51. Level output module 1

52. Level output module 2 6. Voltage/frequency conversion module

7. Electronic equipment interface 8. Comparator

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessarily confusing the concept of the present invention.

The method for making a portable precision testing instrument based on the electronic equipment of the present invention is to manufacture an interface circuit from a sensor to the electronic equipment. Wherein, the electronic equipment is an intelligent electronic equipment such as a computer and a mobile phone with signal input and output and a display device. The sensor 2 of the present invention inputs the detected signal into the electronic device, and then uses software to complete the data processing work, and then the electronic device displays the result. The invention utilizes the information processing, display and communication functions of the electronic device to realize the device's small size, low cost, easy portability, easy upgrade and diversified functions.

Fig. 1 is the schematic flow chart of the method for making portable precision testing instrument based on electronic equipment of the present invention, as shown in Fig. 1, the present invention provides a kind of method for making portable precision testing instrument based on electronic equipment comprising:

Connect the detected signal to sensor 2;

The sensor 2 transmits the detected signal to the intensity/voltage conversion module 3, and the intensity/voltage conversion module 3 converts the detected signal into a voltage signal;

The voltage signal is operationally amplified through the operational amplifier 4;

The level output module 5 is connected with the voltage/frequency conversion module 6, and is used to represent the number of stages of the operational amplifier;

The voltage/frequency conversion module 6 receives the voltage value after the operational amplifier 4 is operationally amplified, and converts the voltage value into a frequency value. The output amplitude of the voltage/frequency conversion module 6 is determined by the level output module 5, and the voltage/frequency conversion module 5 can also convert the voltage/frequency The output amplitude of the frequency conversion module 6 is modulated into the level shown in the level output module 5;

The frequency value and amplitude are transmitted to the electronic equipment through the electronic equipment interface 7;

Wherein, the power supply 1 supplies power for the entire test circuit.

In a further embodiment of the present invention, the operational amplifier 4 is a multi-stage operational amplifier, the number of stages of the operational amplifier 4 is selected according to the strength of the voltage signal converted by the intensity/voltage conversion module 3, and the intensity/voltage conversion module 3 is converted into The voltage signals are subjected to different stages of operational amplification, wherein the number of level output modules 5 in the circuit after multi-stage operational amplification is the same as the number of stages of operational amplifiers 4 .

The following takes two operational amplifiers as an example to illustrate the process of signal transmission:

When the signal received by the sensor 2 is the first signal, the first signal is directly output to the voltage/frequency conversion module 6 after being amplified by the first-stage operational amplifier 41;

When the signal received by the sensor 2 is the second signal, the second signal will first be operationally amplified by the first-stage operational amplifier 41, and the voltage signal after the first-stage operational amplifier will be transmitted to the comparator 8 and compared with the set value of the comparator 8 itself. The reference potential is compared, and the output voltage signal after the comparison is transmitted to the secondary operational amplifier 42, and the voltage signal after the secondary operational amplification is output to the voltage/frequency conversion module 6;

It should be noted that the first signal strength is greater than the second signal strength; the comparator 8 is connected between the primary operational amplifier 41 and the secondary operational amplifier 42, and one port of the comparator 8 is connected to the voltage/frequency conversion module 6; The first level output module 51 and the second level output module 52 are connected to the voltage/frequency conversion module 6 and selected by the comparator 8 . If the strength of the signal received by the sensor 2 is weaker or weaker, it can also pass through three stages of operational amplifiers, four stages of operational amplifiers or more stages of operational amplifiers.

Fig. 2 is a schematic diagram of a frame structure of a device for making a portable precision test instrument based on an electronic device of the present invention. As shown in Fig. 2 , a device for making a portable precision test device based on an electronic device is provided, including: a power supply 1, a sensor 2 , an intensity/voltage conversion module 3 , an operational amplifier 4 , a level output module 5 , a voltage/frequency conversion module 6 and an electronic device interface 7 .

In the device for making portable precision testing instruments based on electronic equipment, the power supply 1 is used to supply power to the entire test circuit; the sensor 2 is used to receive the detected signal; the intensity/voltage conversion module 3 is connected between the sensor 2 and the operational amplifier 4, It is used to convert the detected signal into a voltage signal; the operational amplifier 4 is connected with the intensity/voltage conversion module 3 for performing operational amplification on the signal; the level output module 5 is connected with the voltage/frequency conversion module 6 for indicating operation The number of stages of the amplifier 4; the voltage/frequency conversion module 6 is used to receive the voltage value amplified by the operational amplifier 4 and convert the voltage value into a frequency value, and the output amplitude of the voltage/frequency conversion module 6 is determined by the level output module 5 , the output amplitude of the voltage/frequency conversion module 6 can also be modulated to the level shown in the level output module 5; the electronic equipment interface 7 is used to receive the frequency signal and amplitude output by the voltage/frequency conversion module 6, and transmit to electronic equipment.

In a further embodiment of the present invention, the device for making portable precision test instruments based on electronic equipment of the present invention can also include a comparator 8, which is provided with a reference potential, and the operational amplifier 4 includes a first-stage operational amplifier 41 and a second-stage operational amplifier 42 .

When the signal received by the sensor 2 is the first signal, the first signal is directly output to the voltage/frequency conversion module 6 after being operationally amplified by the first-stage operational amplifier 41 .

When the signal received by the sensor 2 is the second signal, the second signal will first be operationally amplified by the first-stage operational amplifier 41, and the voltage signal after the first-stage operational amplifier will be transmitted to the comparator 8 and compared with the set value of the comparator 8 itself. The reference potentials are compared, and the output voltage signal after the comparison is transmitted to the secondary operational amplifier 42 , and the voltage signal amplified by the secondary operational amplifier is then output to the voltage/frequency conversion module 6 .

It should be noted that the first signal strength is greater than the second signal strength, and the comparator 8 is connected between the first-stage operational amplifier 41 and the second-stage operational amplifier 42 , and is connected to the input terminal of the voltage/frequency conversion module 6 .

In a further embodiment of the present invention, the sensor 2 can be an electric sensor, a heat sensor, a light sensor, a gas sensor, a force sensor or an acoustic sensor.

In a further embodiment of the present invention, the operational amplifier 4 is a multi-stage operational amplifier, and the level output module 5 is a plurality of level output modules, and each level output module 5 corresponds to the level values of different gears, for Indicates the number of stages of operational amplifier 4. When the number of amplifier stages changes, the level value output by the level output module 5 also changes accordingly. During use, the number of stages of the operational amplifier 4 can be determined according to the range or strength of the transmitted voltage signal, and the number of stages of the operational amplifier 4 can be determined according to the level value corresponding to the level output module 5 .

Fig. 3 is another frame structure diagram of the device for making portable precision testing instruments based on electronic equipment of the present invention. As shown in Fig. 3, a device for making portable precision testing instruments based on electronic equipment is provided, including: power supply 1, sensor 2. Intensity/voltage conversion module 3, primary operational amplifier 41, secondary operational amplifier 42, level output module 1 51, level output module 2 52, comparator 8, voltage/frequency conversion module 6 and electronic equipment interface 7 . Wherein, the operational amplifier 4 includes a first-stage operational amplifier 41 and a second-stage operational amplifier 42 , and the level output module 5 includes two level output modules, namely, a first level output module 51 and a second level output module 52 .

In addition, in a further embodiment of the present invention, the comparator 8 may be provided with a reference potential, and the operational amplifier 4 includes a first-stage operational amplifier 41 and a second-stage operational amplifier 42 . When the signal received by the sensor 2 is the first signal, the first signal is directly transmitted to the voltage/frequency conversion module 6 after being amplified by the first-stage operational amplifier 41; when the signal received by the sensor 2 is the second signal, the second signal will pass through The voltage signal amplified by the first-stage operational amplifier 41 is transmitted to the comparator 8, and the voltage signal received by the comparator 8 is compared with the reference potential and then output to the second-stage operational amplifier 42, which is then amplified by the second-stage operational amplifier 42 The signal is transmitted to the voltage/frequency conversion module 6.

It should be noted that the strength of the second signal is less than the strength of the first signal, the comparator 8 is connected to the input end of the voltage/frequency conversion module 6, and the level output module one 51 and the level output module two 52 are all connected to the voltage/frequency conversion module 6. The frequency conversion module 6 is connected to represent the number of stages of the operational amplifier 4 .

The electronic device in the present invention can be a mobile phone, a computer, etc., and is used to receive the frequency signal converted by the voltage/frequency conversion module 6 through the electronic device interface 7, then transmit it to the electronic device, and display it on the display of the electronic device result. The following takes the mobile phone as an example to illustrate the signal transmission process of making a portable precision test instrument based on electronic equipment of the present invention:

When using the device for making portable precision testing instruments based on electronic equipment of the present invention, if the signal received by the sensor 2 is more sensitive, it will be directly output to the voltage/frequency conversion module 6 after being amplified by the first-stage operational amplifier 41; Weak, i.e. not sensitive enough, then output to the positive input terminal of the comparator 8 after the amplification process of the primary operational amplifier 41, the comparator 8 selects the signal after comparing the reference potential, and outputs it to the secondary operational amplifier 42, after two The re-amplified signal of the stage operational amplifier 42 is output to the voltage/frequency conversion module 6 , and then output to the electronic device interface 7 . The level output module 5 simultaneously controls the output voltage amplitudes of two gears, for example: one gear is 2V, the other is 3V, and then through the voltage/frequency conversion module 6, the output result is sent to the mobile phone through the electronic device interface 7 , and finally use the software on the mobile phone to process the output frequency value and display the measurement result.

In general, the signal detected by the sensor 2 is usually relatively weak, and it needs to be amplified by subsequent circuits such as pre-amplification and main amplification before data acquisition can be performed. After the signal is amplified, it adopts a data acquisition method different from the traditional method, that is, the voltage/frequency conversion module 6 is used to convert (convert the amplified voltage signal into a frequency signal with high stability and is conducive to program identification), and send it to the mobile phone through the earphone jack of the mobile phone. , and finally use the application on the mobile phone to process the transformed frequency signal and display the measurement results. Wherein, the number of stages of operational amplification can be selected according to the signal sensitivity or signal strength detected by the sensor 2 .

Since the above-mentioned two-level access signals correspond to signals of different sizes, the small signal is amplified once, and the weaker signal is amplified twice. It may appear that the voltage after the two levels of amplification is the same, so the frequency value after conversion Are the same. However, since the original signals are different, the corresponding final output pull-up potentials are different, the weaker signal corresponds to the 2V potential output, and the small signal corresponds to the 3V point output. In this way, it can be judged by the amplitude difference of the output pulse whether the output signal has experienced one-stage amplification or two-stage amplification, so as to determine which section the original signal is located in, and then calculate the frequency of the output pulse through the software to obtain the original signal in the The specific position in each section, so as to solve the problem of insufficient dynamic range of AD. If the signal is too weak or the dynamic range is larger, you can use 3 or more stages of operational amplification, and divide the test area into 3 or more segments to improve the dynamic range, so that you can completely break through the dynamic range of mobile phone data collection Insufficient problem.

General electronic devices, such as mobile phones, provide data collection methods mainly through the mobile phone headphone jack into the mobile phone, and then through the DC blocking circuit and filter for filtering, therefore, the voltage/frequency conversion module 6 is used to convert the DC signal into the The desired frequency signal will not be filtered out by the filter. Precision testing instruments and meters have high requirements for data accuracy, and the loss of the earphone jack interface of ordinary mobile phones is unreliable, which will inevitably affect the measurement accuracy. However, after conversion by the voltage/frequency conversion module 6 , the pulse frequency represents the measurement signal, and the small change of the converted power does not affect the test result. Therefore, the accuracy of the test is guaranteed.

Using the headphone jack of a mobile phone to input signals will inevitably be restricted by the dynamic range of the sound card’s analog-to-digital conversion. In particular, precision test instruments generally have a large dynamic range (more than 100dB), and for 16-bit AD, the dynamic range is not enough. It is at 216, which is less than 50dB. In addition to converting the signal into output signals of different frequencies, the present invention also classifies the entire measurement range into several sections according to the strength of the signal, thus breaking through the limitation of the AD digits on the dynamic range of the detection signal. The specific method is to realize an automatic gear switching output between the preamplifier and the main amplifier circuit according to the specific strength of the signal, that is, the signal with a slightly stronger signal only needs one stage of preamplification, skips the main amplifier, and automatically performs voltage adjustment. After conversion by the frequency/frequency conversion module 6, it is sent to electronic equipment for processing; and weaker signals need pre-amplification and main amplification to be connected to the conversion part of the voltage/frequency conversion module 6, and then input to the electronic equipment after conversion. In order to distinguish the two strong and weak signals, the voltage maintained by the output frequency is also different. Similarly, the voltage of this part is also automatically switched according to the strength of the signal.

The present invention converts the detected signal into an electrical signal through a corresponding sensor, then converts it into a signal of a certain frequency value and amplitude through the device of the present invention, realizes data acquisition or analog-to-digital conversion through electronic equipment, and converts the analog quantity into a digital quantity. Then the data is processed by electronic equipment, and finally analyzed, stored or displayed.

The present invention has following beneficial effect:

1. It can automatically classify and detect small signals to make the accuracy more accurate, and use the voltage/frequency conversion module to replace the quantization and encoding process of useful signals, reducing the cost and complexity of conversion.

2. It can improve the dynamic range of detection and break through the limitation of AD digits on the dynamic range of detection signals.

3. It can minimize the cost of hardware and reduce the size of test equipment, and use the information processing, display and even communication functions of electronic equipment to realize an easy-to-upgrade, powerful, compact and cheap test instrument.

Those skilled in the art can combine the features of the above-mentioned embodiments without departing from the spirit of the present invention. The present invention can also be used in other electronic devices except mobile phones, and the present invention is not limited to the above-mentioned embodiments.

It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principle of the present invention, and not to limit the present invention. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention shall fall within the protection scope of the present invention. Furthermore, it is intended that the appended claims of the present invention cover all changes and modifications that come within the scope and metes of the appended claims, or equivalents of such scope and metes and bounds.

Claims (10)

1. A method for making portable precision testing instruments based on electronic equipment, characterized in that, comprising: Connect the detected signal to the sensor; The sensor transmits the detected signal to the intensity/voltage conversion module, and the intensity/voltage conversion module converts the detected signal into a voltage signal; The voltage signal is operationally amplified by the operational amplifier; The level output module is connected with the voltage/frequency conversion module, and is used to represent the stages of the operational amplifier; The voltage/frequency conversion module receives the voltage value amplified by the operational amplifier, and converts the voltage value into a frequency value, and the output amplitude of the voltage/frequency conversion module is determined by the level output module; The frequency value and amplitude are transmitted to the electronic device through the electronic device interface; Wherein, the power supply supplies power to the entire test circuit. 2. The method for making a portable precision test instrument based on electronic equipment according to claim 1, wherein the signal transmitted by the sensor is amplified through two stages of operations, wherein, When the signal received by the sensor is the first signal, the first signal is directly output to the voltage/frequency conversion module after being amplified by a first-stage operational amplifier; When the signal received by the sensor is the second signal, the second signal will be firstly amplified by the first-stage operational amplifier, and the voltage signal after the first-stage operational amplifier will be transmitted to the comparator and compared with the comparator itself The set reference potential is compared, and the output voltage signal after the comparison is transmitted to the secondary operational amplifier, and the voltage signal after the secondary operational amplification is output to the voltage/frequency conversion module; Wherein, the first signal strength is greater than the second signal strength; The comparator is connected to the input end of the voltage/frequency conversion module. 3. the method for making portable precision testing instrument based on electronic equipment according to claim 1, is characterized in that, The operational amplifier is a multi-stage operational amplifier, and the number of stages of the operational amplifier is selected according to the strength of the voltage signal converted by the intensity/voltage conversion module; The number of the level output modules in the multi-stage operational amplifier circuit is the same as the number of stages of the operational amplifier. 4. the method for making portable precision testing instrument based on electronic equipment according to claim 1, is characterized in that, The sensor is an electric sensor, a thermal sensor, a light sensor, a gas sensor, a force sensor or an acoustic sensor. 5. the method for making portable precision testing instrument based on electronic equipment according to claim 1, is characterized in that, described strength/voltage conversion module is resistance/voltage conversion module, current/voltage conversion module, power/voltage conversion module, Capacitance/voltage conversion module or inductance/voltage conversion module. 6. A device for making portable precision testing instruments based on electronic equipment, characterized in that it comprises: Power supply, sensor, intensity/voltage conversion module, operational amplifier, level output module, voltage/frequency conversion module and electronic equipment interface; among them, The power supply is used to supply power to the entire test circuit; The sensor is used to receive the detected signal; The intensity/voltage conversion module is connected between the sensor and the operational amplifier, and is used to convert the detected signal into a voltage signal; The operational amplifier is connected to the intensity/voltage conversion module for operationally amplifying the signal; The level output module is connected with the voltage/frequency conversion module, which is used to indicate the number of stages of the operational amplifier; The voltage/frequency conversion module is used to receive the voltage value amplified by the operational amplifier and convert the voltage value into a frequency value, and the output amplitude of the voltage/frequency conversion module is determined by the level output module; The electronic device interface is used to receive the frequency value and amplitude output by the voltage/frequency conversion module and transmit them to the electronic device. 7. the device of making portable precision testing instrument based on electronic equipment according to claim 6, is characterized in that, A comparator is also included, which is provided with a reference potential; The operational amplifier includes a first-stage operational amplifier and a second-stage operational amplifier; wherein, When the signal received by the sensor is the first signal, the first signal is directly output to the voltage/frequency conversion module after being operationally amplified by the first-stage operational amplifier; When the signal received by the sensor is the second signal, the second signal will be firstly amplified by the first-stage operational amplifier, and the voltage signal after the first-stage operational amplifier will be transmitted to the comparator and compared with the comparator itself The set reference potential is compared, and the output voltage signal after comparison is transmitted to the second-stage operational amplifier, and the voltage signal after the second-stage operational amplification is output to the voltage/frequency conversion module; Wherein, the first signal strength is greater than the second signal strength; The comparator is connected to the input end of the voltage/frequency conversion module. 8. The device for making portable precision testing instruments based on electronic equipment according to claim 6, wherein, The operational amplifier is a multi-stage operational amplifier, and the number of stages of the operational amplifier is selected according to the strength of the voltage signal converted by the intensity/voltage conversion module; The number of the level output modules in the multi-stage operational amplification circuit is the same as the number of stages of the operational amplifiers, and each of the level output modules corresponds to a voltage value of a different gear. 9. The device for making portable precision testing instruments based on electronic equipment according to claim 6, wherein, The sensor is an electric sensor, a thermal sensor, a light sensor, a gas sensor, a force sensor or an acoustic sensor. 10. The device for making portable precision testing instruments based on electronic equipment according to claim 6, characterized in that, The intensity/voltage conversion module is a resistance/voltage conversion module, a current/voltage conversion module, a power/voltage conversion module, a capacitance/voltage conversion module or an inductance/voltage conversion module.